Lantronix Micro125 User Manual micro125.pdf

Part Number 900-588
Revision E December 2017
Micro125
Embedded Device Server
User Guide

Micro125 Embedded Device Server User Guide 2
Intellectual Property
© 2017 Lantronix, Inc. All rights reserved. No part of the contents of this book may be transmitted
or reproduced in any form or by any means without the written permission of Lantronix, Inc. in the
United States and other countries.
Lantronix is a registered trademark and DeviceInstaller is a trademark of Lantronix, Inc.
Patented: http://patents.lantronix.com; additional patents pending.
Windows is a trademark of the Microsoft Corporation.
Warranty
For details on the Lantronix warranty replacement policy, please go to our Web site at
www.lantronix.com/support/warranty.
Contacts
Lantronix Corporate Headquarters
7535 Irvine Center Drive
Suite 100
Irvine, CA 92618, USA
Toll Free: 800-526-8766
Phone: 949-453-3990
Fax: 949-453-3995
Technical Support Online: www.lantronix.com/support
Sales Offices
For a current list of our domestic and international sales offices, go to the Lantronix web site at
www.lantronix.com/about/contact.
Disclaimer
Operation of this equipment in a residential area is likely to cause interference, in which case the
user, at his or her own expense, will be required to take whatever measures may be required to
correct the interference.
Note: Changes or modifications to this device not explicitly approved by Lantronix will void the
user's authority to operate this device.
All information contained herein is provided “AS IS.” Lantronix undertakes no obligation to update
the information in this publication. Lantronix does not make, and specifically disclaims, all
warranties of any kind (express, implied or otherwise) regarding title, non-infringement, fitness,
quality, accuracy, completeness, usefulness, suitability or performance of the information
provided herein. Lantronix shall have no liability whatsoever to any user for any damages, losses
and causes of action (whether in contract or in tort or otherwise) in connection with the user’s
access or usage of any of the information or content contained herein. The information and
specifications contained in this document are subject to change without notice.

Revision History
Date Rev. Firmware Comments
March 2011 A 6.7.0.2 Initial release
March 2013 B 6.8.0.4 Updated for firmware release 6.8.0.4.
July 2015 C 6.11.0.0 Updated for firmware release 6.11.0.0.
September 2017 D 6.11.0.0 Updated part number information.
December 2017 E Updated enhanced password information.
For the latest revision of this product document, please check our online documentation at
www.lantronix.com/support/documentation.

Table of Contents
Intellectual Property __________________________________________________ 2
Warranty ___________________________________________________________ 2
Contacts ___________________________________________________________ 2
Disclaimer __________________________________________________________ 2
Revision History _____________________________________________________ 3
List of Figures _______________________________________________________ 7
List of Tables________________________________________________________ 7
1. Using This Guide 8
Purpose and Audience ________________________________________________ 8
Chapter Summary____________________________________________________ 8
Additional Documentation ______________________________________________ 9
Part Numbers _______________________________________________________ 9
2. Introduction 10
Capabilities ________________________________________________________ 10
Applications________________________________________________________ 10
Configuration Methods _______________________________________________ 11
Addresses and Port Numbers__________________________________________ 11
Hardware Address _______________________________________________ 11
IP Address _____________________________________________________ 11
Port Numbers ___________________________________________________ 11
3. Getting Started 12
Physically Connecting the Unit _________________________________________ 12
Required Information_________________________________________________ 13
Hardware Address _______________________________________________ 13
IP Address _____________________________________________________ 13
4. Using the DeviceInstaller Utility 14
Installing the DeviceInstaller Utility ______________________________________ 14
Assigning an IP Address______________________________________________ 14
Accessing the Micro125 Using the DeviceInstaller Utility_____________________ 15
Viewing the Current Configuration ______________________________________ 15
5. Configuration Using Web Manager 18
Accessing Web-Manager Using the DeviceInstaller Utility____________________ 18
Network Configuration _______________________________________________ 19
Network Mode __________________________________________________ 20
Automatic IP Address Configuration _________________________________ 20
Static IP Address Configuration _____________________________________ 21
Ethernet Configuration ____________________________________________ 22
Server Configuration _________________________________________________ 23
Server Configuration______________________________________________ 24

Advanced ______________________________________________________ 24
Host List Configuration _______________________________________________ 25
Retry Settings ___________________________________________________ 25
Host Information _________________________________________________ 26
Channel 1 and Channel 2 Configuration__________________________________ 26
Serial Settings __________________________________________________ 26
Connection Settings - TCP_________________________________________ 29
Connection Settings - UDP_________________________________________ 33
Apply Settings ______________________________________________________ 35
Apply Defaults______________________________________________________ 35
6. Configuration via Telnet or Serial Port (Setup Mode) 36
Accessing Setup Mode _______________________________________________ 36
Telnet Connection _______________________________________________ 36
Serial Port Connection ____________________________________________ 37
Exiting Setup Mode__________________________________________________ 37
7. Setup Mode: Server Configuration 38
Server Configuration (Option 0) ________________________________________ 38
IP Address_________________________________________________________ 38
Set Gateway IP Address______________________________________________ 39
Netmask: Number of Bits for Host Part___________________________________ 39
Set DNS Server IP Address ___________________________________________ 39
Change Telnet/Web-Manager Password _________________________________ 40
DHCP Name _______________________________________________________ 40
Enable DHCP FQDN Option___________________________________________ 40
8. Setup Mode: Channel Configuration 41
Setup Mode (Option 2) _______________________________________________ 41
Channels_______________________________________________________ 41
Baudrate _______________________________________________________ 41
I/F (Interface) Mode ______________________________________________ 42
I/F Mode _______________________________________________________ 43
Flow __________________________________________________________ 43
Port Number ____________________________________________________ 43
Connect Mode __________________________________________________ 44
Send the Escape Sequence (+++) in Modem Mode _____________________ 49
Show IP addr after 'RING' _________________________________________ 50
Auto Increment Source Port ________________________________________ 50
Remote IP Address ______________________________________________ 50
Remote Port ____________________________________________________ 50
DisConnMode___________________________________________________ 50
Flush Mode (Buffer Flushing) _______________________________________ 51
Pack Control ____________________________________________________ 52
DisConnTime (Inactivity Timeout) ___________________________________ 53
Send Characters_________________________________________________ 53
Telnet Terminal Type _____________________________________________ 53
Channel (Port) Password __________________________________________ 53

9. Setup Mode: Advanced Settings 54
Expert Settings (Option 5)_____________________________________________ 54
TCP Keepalive Time in Seconds ____________________________________ 54
ARP Cache Timeout in Seconds ____________________________________ 54
Monitor Mode at Bootup ___________________________________________ 55
HTTP Port Number_______________________________________________ 55
MTU Size ______________________________________________________ 55
TCP Re-transmission Timeout ______________________________________ 55
Ethernet Connection Type _________________________________________ 55
Security Settings (Option 6) ___________________________________________ 55
Disable SNMP __________________________________________________ 56
SNMP Community Name __________________________________________ 56
Disable Telnet Setup _____________________________________________ 56
Disable TFTP Firmware Upgrade____________________________________ 56
Disable Port 77FE (Hex)___________________________________________ 57
77FEh Access Mode _____________________________________________ 57
Disable Web Server ______________________________________________ 57
Disable Web Setup_______________________________________________ 57
Disable ECHO Ports______________________________________________ 57
Enable Encryption _______________________________________________ 57
Enable Enhanced Password _______________________________________ 58
Default Settings (Option 7) ____________________________________________ 59
Channel 1 and Channel 2 Configuration Defaults _______________________ 59
Expert Settings Defaults___________________________________________ 59
Security Settings Defaults _________________________________________ 59
10. Firmware Upgrades 61
Obtaining Firmware__________________________________________________ 61
Reloading Firmware _________________________________________________ 61
Using TFTP: Graphical User Interface ________________________________ 61
Using TFTP: Command Line Interface________________________________ 62
Recovering the Firmware Using the Serial Port and the DeviceInstaller Application
______________________________________________________________ 62
11. Monitor Mode 64
Entering Monitor Mode Using the Serial Port ______________________________ 64
Entering Monitor Mode Using the Network Port ____________________________ 64
Monitor Mode Commands _________________________________________ 64
12. Troubleshooting 67
Problems and Error Messages _________________________________________ 67
A: Lantronix Technical Support 70
B: Binary to Hexadecimal Conversions 71
Converting Binary to Hexadecimal ______________________________________ 71
Conversion Table ________________________________________________ 71
Scientific Calculator ______________________________________________ 72

List of Figures
Figure 3-1. Evaluation Board Connected to Serial Device and Network _________ 12
Figure 5-1. Lantronix Web-Manager_____________________________________ 19
Figure 5-2. Network Settings __________________________________________ 20
Figure 5-3. Server Settings ____________________________________________ 23
Figure 5-4. Hostlist Settings ___________________________________________ 25
Figure 5-5. Channel Serial Settings _____________________________________ 26
Figure 5-6. TCP Connection Settings ____________________________________ 29
Figure 5-7. UDP Connection Settings____________________________________ 33
Figure 5-8. Applying Settings __________________________________________ 35
Figure 5-9. Applying Default Settings ____________________________________ 35
Figure 6-1. MAC Address _____________________________________________ 36
Figure 6-2. Setup Menu Options________________________________________ 37
Figure 8-1. Serial Port Parameters ______________________________________ 41
Figure 8-2. Hostlist Option ____________________________________________ 46
Figure 9-1. Expert Settings ____________________________________________ 54
Figure 9-2. Security Settings___________________________________________ 56
Figure 10-1. TFTP Window____________________________________________ 62
List of Tables
Table 1-1 Micro125 Part Numbers _______________________________________ 9
Table 7-1. BootP/DHCP/AutoIP options __________________________________ 38
Table 7-2. Standard IP Network Netmasks _______________________________ 39
Table 8-1. Interface Mode Options ______________________________________ 42
Table 8-2. Common Interface Mode Settings ______________________________ 42
Table 8-3. Interface Mode Options ______________________________________ 43
Table 8-4. Flow Control Options ________________________________________ 43
Table 8-5. Reserved Port Numbers _____________________________________ 43
Table 8-6. Connect Mode Options ______________________________________ 44
Table 8-7. Manual Connection Address Example __________________________ 46
Table 8-8. Modem Modes _____________________________________________ 47
Table 8-9. Modem Mode Messages _____________________________________ 48
Table 8-10. Modem Mode Commands ___________________________________ 49
Table 8-11. Disconnect Mode Options ___________________________________ 50
Table 8-12. Flush Mode Options________________________________________ 51
Table 8-13. Pack Control Options_______________________________________ 52
Table 9-1. Expert Settings: Default Values________________________________ 54
Table 10-1. Firmware Files ____________________________________________ 61
Table 11-1. Monitor Mode Commands ___________________________________ 65
Table 11-2. Command Response Codes _________________________________ 66

1. Using This Guide
Purpose and Audience
This guide covers the Lantronix® Micro125 embedded device server. It provides the information
needed to configure, use, and update the Micro125 firmware and is intended for OEMs and
system integrators who are embedding the Micro125 into their end product designs.
Chapter Summary
The remaining chapters in this guide include:
Chapter Description
2: Introduction Describes the main features of the Micro125 and the protocols it
supports.
3: Getting Started Provides information for physically connecting your unit.
4: Using the DeviceInstaller Utility Provides information for getting your unit up and running, using the
DeviceInstaller utility to assign an IP address.
5: Configuration Using Web
Manager
Details using the Web-Manager to set parameters such as port and
server properties.
6: Configuration via Telnet or Serial
Port (Setup Mode)
Provides instructions for accessing Setup Mode (command line
interface) using a Telnet connection through the network or a
terminal or terminal emulation program through the serial port.
7: Setup Mode: Server
Configuration
Details the network (server) settings
8: Setup Mode: Channel
Configuration
Details the serial port settings.
9: Setup Mode: Advanced Settings Details expert, and security settings and explains how to reset the
unit to factory default values.
10: Firmware Upgrades Provides instructions for obtaining the latest firmware and updating
the Micro125 device.
11: Monitor Mode Provides instructions for accessing and using the command line
interface for monitoring the network and diagnosing problems.
12: Troubleshooting Describes common problems and error messages and how to
contact Lantronix Technical Support.
A: Lantronix Technical Support Provides information on how to contact Lantronix Technical Support.
B: Binary to Hexadecimal
Conversions
Provides instructions for converting binary numbers to hexadecimals.

1: Using This Guide
Additional Documentation
Visit the Lantronix Web site at www.lantronix.com/support/documentation for the latest
documentation and the following additional documentation.
Document Description
Micro125 Integration Guide Provides information about the Micro125 hardware, testing the
Micro125 using the evaluation board, and integrating the Micro125
into your product.
Com Port Redirector User Guide Provides information on using the Lantronix Windows based utility
to create a secure virtual com port.
DeviceInstaller Online Help Provides information on using the DeviceInstaller utility to
configure IP addresses and locate Lantronix devices on the
network.
“Live” Tutorials on the Lantronix
Web Site (English)
Explain and demonstrate assigning an IP address to the UDS and
setting up the UDS and Com Port Redirector. See
http://ltxfaq.custhelp.com/app/answers/detail/a_id/1119
Part Numbers
Micro 125 embedded device server part numbers are listed below.
Table 1-1 Micro125 Part Numbers
Part Number Description
MO22AA0M3-01R Micro125 Embedded Device Server, Modbus, Pin Header for Ethernet, Pin
Header for LED, TTL Pin Header, RoHS
MO00AA003-01R Micro125, No RJ45 connector, No LEDS, with TTL pin header, RoHS
MO00AA0E3-01R AES Encrypted Micro125, No RJ45 connector, No LEDS, with TTL pin
header, RoHS
MO11AA003-01R Micro125 with RJ45 connector, LEDS, with TTL pin header, RoHS
MO11AA0E3-01R AES Encrypted Micro125 with RJ45 connector, LEDS, with TTL pin header,
RoHS
MO22AA003-01R Micro125, Pin header for Ethernet, Pin header for LED connection, with TTL
pin header, RoHS
MO22AA0E3-01R AES Encrypted Micro125, Pin header for Ethernet, Pin header for LED
connection, with TTL pin header, RoHS

2. Introduction
This chapter summarizes the Micro125 embedded device server’s features and the basic
information needed to get started.
Capabilities
The Micro125 device server has the following capabilities:
 Connects devices through a TCP data channel or through a Telnet connection to computers
or to another device server. The Micro125 also supports UDP datagrams.
 Contains a web [HTTP] server allowing presentation of custom content and easy
configuration through a browser.
Applications
The Micro125 device server connects serial devices such as those listed below to Ethernet
networks using the IP protocol family.
 ATM machines
 CNC controllers
 Data collection devices
 Environmental sensors
 Universal Power Supply (UPS) management units
 Telecommunications equipment
 Data display devices
 Security alarms and access control devices
 Handheld instruments
 Modems
 Time/attendance clocks and terminals
The Micro125 device server uses the Internet Protocol (IP) for network communications. It uses
the Transmission Control Protocol (TCP) to assure that no data is lost or duplicated, and that
everything sent to the connection arrives correctly at the target.
Supported protocols include:
 ARP, UDP, TCP, ICMP, Telnet, TFTP, AutoIP, DHCP, HTTP, and SNMP for network
communications and management.
 TCP, UDP, and Telnet for connections to the serial port.
 TFTP for firmware and web page updates.
 IP for addressing, routing, and data block handling over the network.
 User Datagram Protocol (UDP) for typical datagram applications in which devices interact
with other devices without maintaining a point-to-point connection.

2: Introduction
Configuration Methods
For the unit to operate correctly on a network, it must have a unique IP address on the network.
There are three basic methods for logging into the device server to assign an IP address and
configure the unit:
DeviceInstaller: Assign an IP address and view the current Micro125 configuration using a
Graphical User Interface (GUI) on a PC attached to a network. (See Using the DeviceInstaller
Utility.)
Web-Manager: Through a web interface, configure the Micro125 and its settings using the
Micro125’s Web-Manager. (See Configuration Using Web Manager
Serial & Telnet Ports: There are two approaches to accessing Serial Mode. Make a Telnet
connection to the network port (9999) or connect a terminal (or a PC running a terminal emulation
program) to the unit’s serial port. (See Configuration via Telnet or Serial Port (Setup Mode).)
Addresses and Port Numbers
Hardware Address
The hardware address is also referred to as the Ethernet address or the MAC address.
Note: Make note of the MAC address. It is needed to locate the Micro125 using the
DeviceInstaller utility.
IP Address
Every device connected to an IP network must have a unique IP address. This address is used to
reference the specific unit. The Micro125 is automatically assigned an IP address on DHCP-
enabled networks, as it is DHCP-enabled by default.
Port Numbers
Every TCP connection and every UDP datagram is defined by a destination IP address and a port
number. For example, a Telnet application commonly uses port number 23. A port number is
similar to an extension on a phone system.
The unit's serial channel (port) can be associated with a specific TCP/UDP port number. Port
number 9999 is reserved for access to the unit's Setup (configuration) Mode window. Ports 0-
1024 are reserved as well. For more information on reserved port numbers, see
Table 8-5. Reserved Port Numbers.

3. Getting Started
This chapter covers the steps required to get an embedded device physically connected.
Physically Connecting the Unit
The following diagram shows a properly installed Micro125. Other devices connect in a similar
manner.
Figure 3-1. Evaluation Board Connected to Serial Device and Network
Connect a computer or serial device to your unit.
Connect an Ethernet cable to the RJ-45 Ethernet port.
Supply power to your unit using the power supply that was included in the packaging.
Note: The required input voltage for the Micro125 is 5VDC (+/-5% at ~200 mA). Other devices
may require a different voltage.
Supply power to the serial device.

3: Getting Started
Required Information
Hardware Address
You need to know the unit’s hardware address (also known as the MAC address), which is on the
product label. It is in the format:
Hardware Address: 00 – 20 - 4a - _____ - _____ - _____
Or
Hardware Address : 00 – 80 - A3 - _____ - _____ - _____
IP Address
Your device server must have a unique IP address on your network. The systems administrator
generally provides the IP address and corresponding subnet mask and gateway. The IP address
must be within a valid range, unique to your network, and in the same subnet as your PC.
IP Address: _______ - _______ - _______ - _______
Subnet Mask: _______ - _______ - _______ - _______
Gateway: _______ - _______ - _______ - _______
You have several options for assigning an IP address to your unit. We recommend that you
manually assign the IP address over the network using the DeviceInstaller utility software, which
is described in Using the DeviceInstaller Utility.

4. Using the DeviceInstaller Utility
This chapter covers the steps for getting the Micro125 device server online and viewing its
current configuration.
Note: The Lantronix® DeviceInstaller application is a free utility program provided by
Lantronix that discovers, configures, upgrades, and manages Lantronix Device Servers.
It can be downloaded from the Lantronix website at
www.lantronix.com/support/downloads.
For instructions on using the DeviceInstaller application to configure the IP address and
related settings or for more advanced features, see the DeviceInstaller Online Help.
Installing the DeviceInstaller Utility
To install the DeviceInstaller Utility:
1. Download the latest version of the DeviceInstaller utility from
http://www.lantronix.com/downloads.
2. Run the executable to start the installation process.
3. Respond to the installation wizard prompts. (If prompted to select an installation type, select
Typical).
Assigning an IP Address
The unit’s IP address must be configured before it can work correctly on a network. You have
several options for assigning an IP to your unit. We recommend that you manually assign the IP
address over the network using the DeviceInstaller utility.
Note: To use a serial connection instead of an Ethernet connection to configure the device, see
Chapter 6: Configuration via Telnet or Serial Port (Setup Mode).
The unit’s IP address is normally set to 0.0.0.0 at the factory. The hardware address is on the
product label. The unit is DHCP enabled as the default.
To assign an IP address manually:
1. Click StartAll Programs  LantronixDeviceInstaller 4.4DeviceInstaller. If your PC
has more than one network adapter, a message displays. Select an adapter and click OK.
Note: If the unit already has an IP address (e.g., DHCP has assigned an IP address), click the
Search icon and select the unit from the list of Lantronix device servers on the local network.
2. Click the Assign IP icon .
3. If prompted, enter the hardware address (on the product label) and click Next.
4. Select Assign a specific IP address and click Next.

4: Using the DeviceInstaller Utility
5. Enter the IP address. The Subnet mask displays automatically based on the IP address; if
desired, you may change it. On a local network, you can leave the Default gateway blank (all
zeros). Click Next.
6. Click the Assign button and wait several seconds until a confirmation message displays.
Click Finish.
7. Select the device from the main window list and select Ping from the Tools menu. The Ping
Device dialog box shows the IP address of the selected unit.
8. From the Tools menu, click the Ping button. The results display in the Status window. Click
the Clear Status button to clear the window so you can ping the device again.
Note: If you do not receive “Reply” messages, make sure the unit is properly attached to the
network and that the IP address assigned is valid for the particular network segment you are
working with. If you are not sure, check with your systems administrator.
9. Click the Close button to close the dialog box and return to the main window.
Accessing the Micro125 Using the DeviceInstaller Utility
1. Click StartPrograms  LantronixDeviceInstallerDeviceInstaller.
2. Click the Micro folder. The list of available Lantronix Micro-type devices displays.
3. Expand the list of Micro125 devices by clicking the + symbol next to the Micro125 icon. Select
the Micro125 unit by clicking on its IP address to view its configuration.
Viewing the Current Configuration
The DeviceInstaller application provides a view of the unit's configuration.
To view the unit's current settings:
1. Follow the instructions above to locate the Micro125.
2. In the right pane, click the Device Details tab. The current Micro125 configuration displays:
Device Details
Settings
Description
Name Configurable field. A name that identifies the Micro125.
Double-click the field, type in the value, and press Enter to complete. This
name is not visible on other PCs or laptops using the DeviceInstaller
application.
DHCP Device Name Non-configurable field. Displays the name associated with Micro125’s
current IP address, if the IP address was obtained dynamically.
To change the DHCP device name, see sections, Configuration Using
Web Manager
or Configuration via Telnet or Serial Port (Setup Mode).
Group Configurable field. A group name to categorize the Micro125.
group name is not visible on other PCs or laptops using the DeviceInstaller
utility.

Device Details
Settings
Description
Comments Configurable field. Information about the Micro125.
description or comment is not visible on other PCs or laptops using the
DeviceInstaller utility.
Device Family Non-configurable field. Displays the Micro125’s device family as Micro125.
Type Non-configurable field. Displays the device type as Micro125.
ID Non-configurable field. Displays the Micro125’s ID embedded within the
box.
Hardware Address Non-configurable field. Displays the Micro125’s hardware (or MAC)
address.
Firmware Version Non-configurable field. Displays the firmware currently installed on the
Micro.
Extended Firmware
Version
Non-configurable field. Displays the full version nomenclature of the
firmware.
Online Status Non-configurable field. Displays the Micro125’s status as online, offline,
unreachable (the Micro125 is on a different subnet), or busy (the Micro125
is currently performing a task).
IP Address Non-configurable field. Displays the Micro125’s current IP address. To
change the IP address, click Assign IP on the DeviceInstaller menu bar.
IP Address was
Obtained
Displays “Dynamically” if the device automatically received an IP address
(e.g., from DHCP). Displays “Statically” if the IP address was configured
manually. If the IP address was assigned dynamically, the following fields
appear:
 Obtain via DHCP with value of True or False.
 Obtain via BOOTP with value of True or False.
 Obtain via RARP with value of True or False
 Obtain via Auto IP with value of True or False
Subnet Mask Non-configurable field. Displays the Micro125’s current subnet mask.
Gateway Non-configurable field. Displays the Micro125’s current gateway.
Number of COB
partitions supported
Non-configurable field. Displays the number of COB partitions supported.
Number of Serial
Ports
Non-configurable field. Displays the number of ports on the Micro125.
TCP Keepalive Non-configurable field. Displays 1-65s, the Micro125’s TCP keepalive
value. The default setting is 45.
Telnet Supported Non-configurable field. Indicates whether Telnet is enabled on this
Micro125.
Telnet Port Non-configurable field. Displays the Micro125’s port for Telnet sessions.
Web Port Non-configurable field. Displays the Micro125’s port for Web-Manager
configuration.
Maximum Baud Rate
Supported
Non-configurable field. Displays the Micro125’s maximum baud rate.
Note: the Micro125 may not currently be running at this rate.
Firmware
Upgradeable
Non-configurable field. Displays True, indicating the Micro125’s firmware is
upgradeable as newer versions become available.

Device Details
Settings
Description
Supports
Configurable Pins
Non-configurable field. Displays False, indicating configurable pins are not
available on the Micro125.
Supports Email
Triggers
Non-configurable field. Displays False, indicating email triggers are not
available on the Micro125.
Supports AES Data
Stream
Non-configurable field. Displays True if the Micro125 unit supports AES
encryption.
Supports 485 Non-configurable field. Displays True, indicating the Micro125 supports the
RS-485 protocol.
Supports 921K Baud
Rate
Non-configurable field. Displays False. Micro125 does not support baud
rates up to 921 Kbps.
Supports HTTP
Server
Non-configurable field. Displays True.
Supports HTTP
Setup
Supports 230K Baud
Rate
Supports GPIO Non-configurable field. Displays False, indicating the Micro125 does not
support communication via General Purpose Input Output (GPIO).

5. Configuration Using Web Manager
You must configure the unit so that it can communicate on a network with your serial device. For
example, you must set the way the unit will respond to serial and network traffic, how it will handle
serial packets, and when to start or close a connection.
The unit’s configuration is stored in nonvolatile memory and is retained without power. You can
change the configuration at any time. The unit performs a reset after you change and store the
configuration.
In this chapter, we describe how to configure the Micro125 using Web-Manager, Lantronix’s
browser-based configuration tool. (For information on using Setup Mode, our command line
configuration interface, see Chapter 6: Configuration via Telnet or Serial Port (Setup Mode).
Note: The examples in this section show a typical device. Your device may have different
configuration options.
Accessing Web-Manager Using the DeviceInstaller Utility
Note: For more information on the DeviceInstaller application, see Chapter 4: Using the
DeviceInstaller Utility.
1. Run the DeviceInstaller application and search for the list of available Lantronix device
servers.
2. Click on the Micro folder. The list of available Micro type devices displays.
3. Expand the list of Micro125 devices by clicking the + symbol next to the Micro125 icon.
4. Select the Micro125 unit by clicking its hardware address.
5. In the right pane, click the Web Configuration tab.
6. To view the Micro125’s Web-Manager in the current DeviceInstaller window, click the Go
button. To open the Web-Manager in a web browser, click the External Browser button.
Note: Alternatively, to open Web-Manager, open your web browser and enter the IP address of
the Micro125.
A dialog box appears to prompt for a User name and Password.
7. Perform one of the following:
 If no Telnet/Web Manager password has been defined, leave both fields blank and click
OK.
 If a Telnet/Web Manager password has been defined, leave the username blank, type in
the password, and then click OK.
The Web-Manager displays.
Note: We recommend that you always use the enhanced password setting and
create a strong 16 character password. See Security Settings (Option 6) on page 55.

5: Configuration Using Web Manager
Figure 5-1. Lantronix Web-Manager
The main menu is in the left pane of the Web-Manager window.
Network Configuration
The unit’s network values display when you select Network from the main menu. The following
sections describe the configurable parameters on the Network Settings page.

Figure 5-2. Network Settings
Network Mode
1. Click Network from the main menu.
2. Select Wired Only. It is the only choice for Network Mode as it enables the Ethernet network
connectivity.
Automatic IP Address Configuration
An IP address can be assigned automatically. You then enter related network settings.
To assign an IP address automatically:
1. On the main menu, click Network.
2. Select Obtain IP address automatically.
3. Enter the following (as necessary):

Dynamic IP Setting Description
BOOTP Select Enable to permit the Bootstrap Protocol (BOOTP). server to assign
the IP address from a pool of addresses automatically. Enable is the
default.
DHCP Select Enable to permit the Dynamic Host Configuration Protocol (DHCP) to
assign a leased IP address to the Micro125 unit automatically. Enable is the
default.
AutoIP Select Enable to permit the Micro125 to generate an IP in the 169.254.x.x
address range with a Class B subnet. Enable is the default.
DHCP Host Name Enter the desired host name for the Micro125.
Note: Disabling BOOTP, DHCP, and AutoIP (all three checkboxes) is not advised as the only
available IP assignment method will then be ARP or serial port.
4. When you are finished, click the OK button.
5. On the main menu, click Apply Settings.
Static IP Address Configuration
You manually assign an IP address to the unit and enter related network settings.
To assign an IP address manually:
2. Select Use the following IP configuration.
Static IP Settings Description
IP Address If DHCP is not used to assign IP addresses, enter it manually in decimal-
dot notation. The IP address must be set to a unique value in the network.
Subnet Mask A subnet mask defines the number of bits taken from the IP address that
are assigned for the host part.
Default Gateway The gateway address, or router, allows communication to other LAN
segments. The gateway address should be the IP address of the router
connected to the same LAN segment as the unit. The gateway address
must be within the local network.
DNS Server The DNS server allows the name of a remote machine to be resolved
automatically. Enter the IP address of the DNS server. If the device is
DHCP enabled, the DHCP server provides the DNS server IP address,
which will override this configured value.
Note: This setting is applicable only in Manual Connection mode.

Ethernet Configuration
You must specify the speed and direction of data transmission.
To specify how data will be transmitted:
Ethernet Settings Description
Auto Negotiate With this option, the Ethernet port auto-negotiates the speed and duplex
with the hardware endpoint to which it is connected. This is the default.
If this option is not selected, the complete the fields that become
available:
 Speed: The speed of data transmission. The default is 100
Mbps.
 Duplex: The direction of data transmission. The default is Full.

Server Configuration
The unit’s server values display when you select Server from the main menu. The following
sections describe the configurable parameters on the Server Settings page.
Figure 5-3. Server Settings

To configure the Micro125’s device server settings:
1. On the main menu, click Server.
2. Configure or modify the following fields:
Settings
Description
Enhanced Password Select whether to enable enhanced password:
 Enable: selecting this option enables advanced password
creation, allowing you to create passwords up to 16 bytes in length.
 Disable: selecting this option disables advanced password
creation, allowing you to create basic passwords up to 4 bytes in
length.
Telnet/Web Manager
Password
Enter the password required for Telnet configuration and Web
Manager access.
Retype Password Re-enter the password required for Telnet configuration and Web
Manager access.
Advanced
Advanced Settings Description
ARP Cache Timeout
(secs)
When the unit communicates with another device on the network, it
adds an entry into its ARP table. ARP Cache timeout defines the
number of seconds (1-600) before it refreshes this table.
TCP Keepalive (secs) TCP Keepalive time defines how many seconds the unit waits during
an inactive connection before checking its status. If the unit does not
receive a response, it drops that connection. Enter a value between
0 and 60 seconds. 0 disables keepalive. The default setting is 45.
Monitor Mode @ Bootup Select Disable to disable entry into the monitor mode using the 'yyy'
or 'xx1' key sequence at startup. This field prevents the unit from
entering monitor mode by interpreting the stream of characters that
are received during the device server's initialization at startup.
HTTP Server Port This option allows the configuration of the web server port number.
The valid range is 1-65535. The default port is 80.
Config Server Port Not applicable for this product.
MTU Size The Maximum Transmission Unit (MTU) is the largest physical
packet size a network can transmit for TCP and UDP. Enter between
512 and 1400 bytes. The default is 1400 bytes.
TCP Re-transmission
timeout (ms)
The desired TCP re-transmission timeout value. If the ACK is not
received for a packet sent from the Micro125 device, then the unit
will retransmit the data. The valid range is 500-4000 msec.

Host List Configuration
The Micro125 scrolls through the host list until it connects to a device listed in the host list table.
After a successful connection, the unit stops trying to connect to any others. If this connection
fails, the unit continues to scroll through the table until the next successful connection.
The host list supports a minimum of 1 and a maximum of 12 entries. Each entry contains an IP
address and a port number.
Note: The host list is disabled for Manual and Modem Mode. The unit does not accept a data
connection from a remote device when the hostlist option is enabled.
To configure the Micro125’s host list:
1. On the main menu, click Hostlist.
Figure 5-4. Hostlist Settings
2. Enter or modify the following fields:
Retry Settings
Retry Settings Description
Retry Counter Enter the value for the number of times the Micro125 should attempt to
retry connecting to the host list.
Retry Timeout Enter the duration (in milliseconds) the Micro125 should abandon
attempting a connection to the host list.

Host Information
Host Information
Settings
Description
Host Address Enter or modify the host’s IP address.
Port Enter the target port number.
Channel 1 and Channel 2 Configuration
The Channel 1 and Channel 2 configuration defines how the serial port responds to network and
serial communication.
Serial Settings
To configure the channel’s serial settings:
1. On the main menu, click Serial Settings (under Channel 1 or Channel 2) to display the
Serial Settings window.
Figure 5-5. Channel Serial Settings

2. In the available fields, enter the following information:
Channel 1 or Channel 2
Channel Setting Description
Disable Serial Port Available on Channel 2 settings only. When selected, disables
communication through the serial port. The Disable Serial Port
option will always be disabled for Channel 1.
Note: Using a telnet session (see Baudrate) you may enter a
baud rate of 00 in channel settings to disable the serial port.
Port Settings
Port Settings Description
Protocol From the drop-down menu, select the protocol type for the
selected channel.
Flow Control Flow control manages data flow between devices in a network to
ensure it is processed efficiently. Too much data arriving before a
device is prepared to manage it causes lost or retransmitted data.
None is the default.
Baud Rate The unit and attached serial device, such as a modem, must agree
on a speed or baud rate to use for the serial connection. Valid
baud rates are 300, 600, 1200, 2400, 4800, 9600 (default), 19200,
38400, 57600, 115200 or 230400.
Data Bits Indicates the number of bits in a transmitted data package. The
default is 8.
Parity Checks for the parity bit. The default is None.
Stop Bits The stop bit follows the data & parity bits in serial communication.
It indicates the end of transmission. The default is 1.
Pack Control
Pack Control Settings Description
Enable Packing Select to enable packing on the Micro125.
Two firmware-selectable packing algorithms define how and when
packets are sent to the network.
The standard algorithm is optimized for applications in which the
unit is used in a local environment, allowing for very small delays
for single characters, while keeping the packet count low.
The alternate packing algorithm minimizes the packet count on the
network and is especially useful in applications in a routed Wide
Area Network (WAN). Adjusting parameters in this mode can
economize the network data stream.
Disabled by default.
Idle Gap Time Select the maximum time for inactivity. The default time is
12 milliseconds.
Match 2 Byte Sequence Use to indicate the end of a series of data to be sent as one group.
The sequence must occur sequentially to indicate end of the data

Pack Control Settings Description
collection to the Micro125. The default is No.
Match Bytes Use to indicate the end of a series of data to be sent as one group.
Set this value to 00 if specific functions are not needed.
Send Frame Immediate After the detection of the byte sequence, indicates whether to send
the data frame or the entire buffer. Select Yes to send only the
data frame. The default setting is No.
Send Trailing Bytes Select the number of bytes to send after the end-of-sequence
characters. The default is None.
Flush Input Buffer (Serial to Network)
Flush Input Buffer Settings Description
With Active Connect Select Yes to clear the input buffer with a connection that is
initiated from the device to the network. The default is No.
With Passive Connect Select Yes to clear the input buffer with a connection initiated from
the network to the device. The default is No.
At Time of Disconnect Select Yes to clear the input buffer when the network connection
to or from the device is disconnected. The default is No.
Flush Output Buffer (Network to Serial)
Flush Output Buffer
Settings
Description
With Active Connect Select Yes to clear the output buffer with a connection that is
initiated from the device to the network. The default is No.
With Passive Connect Select Yes to clear the output buffer with a connection initiated
from the network to the device. The default is No.
At Time of Disconnect Select Yes to clear the output buffer when the network connection
to or from the device is disconnected. The default is No.

Connection Settings - TCP
To configure a channel’s TCP settings:
1. On the main menu, click Connection. The Connection Settings window for the channel
displays.
Figure 5-6. TCP Connection Settings

2. In the available fields, enter or modify the following information:
Connect Protocol
Connect Protocol Setting Description
Protocol From the drop-down menu, select TCP.
Connect Mode: Passive Connection
Passive Connection Mode
Settings
Description
Accept Incoming Select Yes to accept incoming connections. The default is Yes.
Password Required Determines whether a password is required for an incoming
passive connection. This field is not available when a password is
set for Telnet mode.
Password If Password Required was set to Yes, enter the password for
passive connections.
Modem Escape Sequence
Pass Through
Disable or enable the unit's ability to send the escape sequence.
The default is Y (Yes) (send the escape sequence).
Connect Mode: Active Connection
Active Connection Mode
Settings
Description
Active Connect Select None to disable Active Connect. Otherwise, indicate the
connection type from the drop-down list:
 With Any Character: Attempts to connect when any
character is received from the serial port.
 With Active Mdm Ctrl In: Accepts external connection
requests only when the Modem Control In input is asserted.
 With Start Character: Attempts to connect when it receives
a specific start character from the serial port. The default start
character is carriage return.
 Manual Connection: Attempts to connect when directed by
a command string received from the serial port.
 Auto Start: Automatically: connects to the remote IP address
and port after booting up.
Start Character If Active Connect is set to With Start Character, enter the start
character in this field.
Modem Mode Indicates the on-screen response type when in Modem Mode (if
Modem Mode is enabled).
Show IP Address After RING Indicates whether to display the remote IP address upon
connection. The default setting is Yes.

Endpoint Configuration
Settings
Description
Local Port Enter the local port number.
Auto increment for Local
Port for active connect
Select to auto-increment the local port number for new outgoing
connections. The range of auto-incremented port numbers is
50,000 to 59,999 and loops back to the beginning when the
maximum range is reached.
Remote Port Enter the remote port number.
Remote Host Enter the IP address of the remote device.
Common Options
Common Option Settings Description
Telnet Com Port Cntrl This field is available for configuration only when Active Connect
is set to None. Select Enable to permit Telnet communication to
the unit. The Telnet Com Port Cntrl feature is used in
conjunction with the Com Port Redirector (CPR) utility. (See the
CPR Online Help for details.)
Terminal Name This field is available for configuration only when Telnet Mode is
set to Enable.
Use the terminal name for the Telnet terminal type. Enter only
one name. When this option is enabled, the unit also reacts to the
end of record (EOR) and binary options, which can be used for
applications such as terminal emulation to IBM hosts.
Connect Response A single character is transmitted to the serial port when there is a
change in connection state. Default setting is None.
Use Hostlist If this option is set to True, the device server scrolls through the
host list until it connects to a device listed in the host list table.
Once it connects, the unit stops trying to connect to any others. If
this connection fails, the unit continues to scroll through the table
until it connects to another IP in the host list.
The host list is disabled for Manual Mode and for Modem Mode.
The unit will not accept a data connection from a remote device
when the host list option is enabled.
LED Select Blink for the status LEDs to blink upon connection or
None for no LED output.
Disconnect Mode
Disconnect Mode Settings Description
On Mdm_Ctrl_In Drop Set to Yes for the network connection to or from the serial port to
disconnect (drop) when Modem Control In transitions from an
asserted state to not asserted state. The default setting is No.
Hard Disconnect When set to Yes, the TCP connection closes even if the remote
site does not acknowledge the disconnect request.

Disconnect Mode Settings Description
Check EOT (Ctrl-D) Select Yes to drop the connection when Ctrl-D or Hex 04 is
detected. Both Telnet Com Port Cntrl and Check EOT
(Ctrl+ D) must be enabled for Disconnect with EOT to function
properly. Ctrl+D is only detected going from the serial port to the
network. The default setting is No.
Inactivity Timeout Use this parameter to set an inactivity timeout. The unit drops the
TCP connection to port 10001/10002* if there is no activity on the
serial line before the set time expires. Enter time in the format
mm:ss, where m is the number of minutes and s is the number of
seconds. To disable the inactivity timeout, enter 00:00.
Note*: The default port number for Port 1 is 10001 and 10002 for
Port 2. However, port numbers may be set to a different value.

Connection Settings - UDP
To configure a channel’s UDP settings:
1. On the main menu, click Connection. The Connection Settings window for the selected
channel displays.
2. In the available fields, enter or modify the following information:
Figure 5-7. UDP Connection Settings
Connect Protocol
Connection Protocol Description
Protocol Select UDP from the drop-down menu.

Datagram Mode
Datagram Mode
Settings
Description
Datagram Type Configures the remote IP or network broadcast address and the
remote port. Enter 01 for directed or broadcast UDP. The default
setting is 00.
Accept Incoming Select Yes to accept incoming UDP datagrams.
Settings
Description
Local Port Enter the local port number.
Remote Port Enter the port number of the remote device.
Remote Host Enter the IP address of the remote device.
Use Broadcast Select to broadcast the UDP datagram. The default is not to
broadcast.
Note: Datagrams are sent as subnet-directed broadcasts.
Device Address Table The table is enabled when Datagram Type is set to FD. Enter values
between 1 and 255 to identify units on the local network of device
servers.
Note: Lantronix Tech Support supports Datagram type 01. Datagram
Type FD is for OEM use.

Apply Settings
1. To save and apply the configuration changes to the device server, click the Apply Settings
button.
Note: Clicking OK on each page does not change the configuration on the device.
Clicking the OK button tells the MatchPort what changes to use; the Apply Settings
makes the changes permanent and reboots the Micro125.
Figure 5-8. Applying Settings
Apply Defaults
1. Click the Apply Defaults button to set the device server back to the default settings. For
details see Default Settings on page 58.
2. Click Yes to set factory settings, or click No to cancel.
Figure 5-9. Applying Default Settings

6. Configuration via Telnet or Serial Port (Setup
Mode)
You must configure the unit so that it can communicate on a network with your serial device. As
an alternative to using a web browser, as described in the previous chapter, you can use the
following procedures remotely or locally:
 Use a Telnet connection to configure the unit over the network.
 Use a terminal or terminal emulation program to access the serial port locally.
The series of prompts at which you enter configuration settings is called Setup Mode.
Note: Detailed information about other setup methods is available from your Lantronix Sales
Associate.
The unit’s configuration is stored in nonvolatile memory and is retained without power. You can
change the configuration at any time. The unit performs a reset after the configuration has been
changed and stored.
This chapter tells you how to access Setup Mode and the general procedure for using it. To
complete the configuration, continue with Chapters 7 Setup Mode: Server Configuration, 8 Setup
Mode: Channel Configuration, and 9 Setup Mode: Advanced Settings.
Note: The menus in the configuration chapters show a typical device. Your device may have
different configuration options.
Accessing Setup Mode
Telnet Connection
To configure the unit over the network, establish a Telnet connection to port 9999.
Note: You can also use the DeviceInstaller application to access Telnet. Select the device from
the main window list, and click the Telnet Configuration tab. Skip steps 1 and 2.
To establish a Telnet connection:
1. From the Windows Start menu, click Run and type the following command, where x.x.x.x is
the IP address, and 9999 is the unit’s fixed network configuration port number:
Windows: telnet x.x.x.x 9999
UNIX: telnet x.x.x.x:9999
2. Click OK. The following information displays.
Figure 6-1. MAC Address
MAC address 12D4AE4A20AA
Software version V6.11.0.0 (150522) M125
Press Enter for Setup Mode

6: Configuration via Telnet or Serial Port (Setup Mode)
3. To enter Setup Mode, press Enter within 5 seconds. The configuration settings display,
followed by the Change Setup menu.
Figure 6-2. Setup Menu Options
Change Setup:
0 Server
1 Channel 1
2 Channel 2
5 Expert
6 Security
7 Defaults
8 Exit without save
9 Save and exit Your choice ? 0
4. Select an option on the menu by entering the number of the option in the Your choice ? field
and pressing Enter.
5. To enter a value for a parameter, type the value and press Enter, or to confirm a current
value, just press Enter.
6. When you are finished, save the new configuration (option 9). The unit reboots.
Serial Port Connection
To configure the unit through a serial connection:
1. Connect a console terminal or PC running a terminal emulation program to your unit's serial
port.
2. Set the terminal emulator serial port settings to 9600 baud, 8 bits, no parity, 1 stop bit, no flow
control.
Note: The Micro125 always uses these serial port settings on boot-up.
3. Reset the Micro125 unit by cycling the unit's power (turning the power off and back on).
Immediately upon resetting the device, enter three lowercase x characters (xxx).
Note: The easiest way to enter Setup Mode is to hold down the x key at the terminal (or
emulation) while resetting the unit. You must do this within three seconds of resetting the
Micro125.
At this point, the screen display is the same as when you use a Telnet connection. To continue,
go to step 4, above under the section, Telnet Connection.
Exiting Setup Mode
To exit setup mode, utilize one of the following two options:
 To save all changes and reboot the device, select option 9 Save and exit from the Change
Setup menu. All values are stored in nonvolatile memory.
 To exit the configuration mode without saving any changes or rebooting, select option 8 Exit
without save from the Change Setup menu.

7. Setup Mode: Server Configuration
This chapter explains how to configure the network settings.
Note: Current values appear in parentheses.
Server Configuration (Option 0)
The unit’s basic network parameters display when you select Server configuration (option 0).
The IP Address, Set Gateway IP Address, and Netmask fields display the current values.
IP Address : (172) .(019) .(203) .(007)
Set Gateway IP Address (Y) ?
Gateway IP addr (172) .(019) .(000) .(001)
Netmask: Number of Bits for Host Part (0=default) (16)
Set DNS Server IP addr (N) ?
Change Telnet/Web Manager password (N) ?
IP Address
If DHCP is not used to assign IP addresses, enter the IP address manually. The IP address must
be set to a unique value in the network. Enter each octet and press Enter between each section.
The current value displays in parentheses.
IP Address : (172) .(019) .(203) .(007)
If DHCP is used, the third octet of the IP address sets the BootP/DHCP/AutoIP options. The
following table shows the bits you can manually configure to force the Micro125 to disable AutoIP,
DHCP, or BootP. To disable an option, set the appropriate bit.
Table 7-1. BootP/DHCP/AutoIP options
Options Bit
AutoIP 0
DHCP 1
BootP 2
For example, if the third octet is 0.0.5.0, the AutoIP and BootP options are disabled; only DHCP is
enabled. (The value 5 results from adding the binary equivalents of 0 and 2.) This is the most
common setting when using DHCP.

7: Setup Mode: Server Configuration
Set Gateway IP Address
The gateway address, or router, allows communication to other LAN segments. The gateway
address should be the IP address of the router connected to the same LAN segment as the unit.
The gateway address must be within the local network. The default is N (No), meaning the
gateway address has not been set. To set the gateway address, type Y and enter the address.
Set Gateway IP Address (Y) ?
Gateway IP addr (172) .(019) .(000) .(001)
Netmask: Number of Bits for Host Part
A netmask defines the number of bits taken from the IP address that are assigned for the host
part.
Netmask: Number of Bits for Host Part (0=default) (16)
Note: Class A: 24 bits; Class B: 16 bits; Class C: 8 bits
The unit prompts for the number of host bits to be entered, then calculates the netmask, which
appears in standard decimal-dot notation (for example, 255.255.255.0) when the saved
parameters display.
Table 7-2. Standard IP Network Netmasks
Network Class Host Bits Netmask
A 24 255.0.0.0
B 16 255.255.0.0
C 8 255.255.255.0
Set DNS Server IP Address
The DNS server allows the name of a remote machine to be resolved automatically. The default
is N (No), indicating the DNS server address has not been set. To set the DNS server address,
type Y. At the prompt, enter the DNS server address. If the device is DHCP enabled, the DHCP
server provides the DNS server IP address, which will override this configured value.
Note: This setting is applicable only in Manual Connection mode.
Set DNS Server IP addr (N) ?

7: Setup Mode: Server Configuration
Change Telnet/Web-Manager Password
Setting the Telnet/Web-Manager password prevents unauthorized access to the setup menu
through a Telnet connection to port 9999 or through web pages.
Please protect your device from unauthorized access and follow the instructions below:
 Always select Y to enable Telnet/Web Manager password
 Enable the enhanced password setting and create a strong 16-character password. For
details, see Security Settings (Option 6) on page 55.
Note: We do not recommend that you only use the 4-character basic password as it does
not offer sufficient security. Using no password is very dangerous.
Change Telnet/Web Manager password (N) ?
DHCP Name
If a DHCP server has automatically assigned the IP address and network settings, you can
discover the unit by using the DeviceInstaller network search feature.
There are three methods for assigning DHCP names to the unit.
Default DHCP Name: If you do not change the DHCP name, and you are using an IP of 0.0.0.0,
then the DHCP name defaults to CXXXXXX (XXXXXX is the last 6 digits of the MAC address
shown on the label on the bottom/side of the unit). For example, if the MAC address is 00-20-4A-
12-34-56, then the default DHCP name is C123456.
Custom DHCP Name: You can create your own DHCP name. If you are using an IP address of
0.0.0.0, then the last option in Server configuration is Change DHCP device name. This option
allows you to change the DHCP name to an alphanumeric name (LTX in our example).
Change DHCP device name (not set) ? (N) Y
Enter new DHCP device name : LTX
Numeric DHCP Name: You can change the DHCP name by specifying the last octet of the IP
address. When you use this method, the DHCP name is LTXYY where YY is what you chose for
the last octet of the IP address. If the IP address you specify is 0.0.0.12, then the DHCP name is
LTX12. This method only works with 2 digit numbers (01-99).
Enable DHCP FQDN Option
A fully qualified domain name (FQDN) is the complete domain name for your device in network.
The FQDN consists of two parts, the hostname and the domain name. For example, an FQDN for
your device might be myxport.lantronix.com. The hostname is myxport, and the host is located
within the domain lantronix.com. The option to enable DHCP FQDN becomes available if DHCP
is enabled.
Enable DHCP FQDN option : (N) ?

8. Setup Mode: Channel Configuration
This chapter explains how to configure the serial port. Two channels may be configured in
Micro125: Channel 1 and Channel 2.
Note: The directions for configuring Channel 1 provided below may also be used for Channel 2.
Setup Mode (Option 2)
Channels
Select Channel 1 (option 1) from the Change Setup menu to define how the serial port responds
to network and serial communications. The following sections describe the configurable
parameters within the Channel configuration menu.
Figure 8-1. Serial Port Parameters
Baudrate (9600) ?
I/F Mode (4C) ?
Flow (00) ?
Port No (10002) ?
ConnectMode (C0) ?
Send '+++' in Modem Mode (Y) ?
Show IP addr after 'RING' (Y) ?
Auto increment source port (N) ?
Remote IP Address : (000) .(000) .(000) .(000)
Remote Port (0) ?
DisConnMode (00) ?
FlushMode (00) ?
DisConnTime (00:00) ?:
SendChar 1 (00) ?
SendChar 2 (00) ?
Baudrate
The unit and attached serial device, such as a modem, must agree on a speed or baud rate to
use for the serial connection. Valid baud rates are 300, 600, 1200, 2400, 4800, 9600 (default),
19200, 38400, 57600, 115200, and 230400 bits per second. The current value is displayed in
parentheses. Entering a baud rate of 00 in channel settings in a telnet sessions disables the
serial port.
Baudrate (9600) ?

8: Setup Mode: Channel Configuration
I/F (Interface) Mode
The Interface (I/F) Mode is a bit-coded byte entered in hexadecimal notation.
I/F Mode (4C) ?
The following table displays available I/F Mode options:
Note: All bit positions in the table that are blank represent “don’t care” bits for that particular
option, which can be set to either a 0 or 1 value.
Table 8-1. Interface Mode Options
I/F Mode Option 7 6 5 4 3 2 1 0
RS-232C
(1)
0 0
7 Bit 1 0
8 Bit 1 1
No Parity 0 0
Even Parity 1 1
Odd Parity 0 1
1 stop bit 0 1
2 stop bits
(1)
1 1
(1) 2 stop bits are implemented by the software. This might influence performance.
The following table demonstrates how to build some common Interface Mode settings:
Table 8-2. Common Interface Mode Settings
Common I/F Mode Setting Binary Hex
RS-232C, 8-bit, No Parity, 1 stop bit 0100 1100 4C
RS-232C, 7-bit, Even Parity, 1 stop bit 0111 1000 78

I/F Mode
Additional settings for RS-422 4-wire and RS-485 2-wire are available on the
Micro125. However, this feature is only supported on channel 1.
Note: All bit positions in the table that are blank represent “don’t care” bits, for that particular
Table 8-3. Interface Mode Options
I/F Mode Option 7 6 5 4 3 2 1 0
RS-422 4-wire 0 1
RS-485 2-wire 1 1
Flow
Flow control sets the local handshaking method for stopping serial input/output.
Flow (00) ?
Use the following table to select flow control options:
Table 8-4. Flow Control Options
Flow Control Option Hex
No flow control 00
XON/XOFF flow control 01
Hardware handshake with RTS/CTS lines 02
XON/XOFF pass characters to host 05
Port Number
The setting represents the source port number in TCP connections. It is the number that identifies
the channel for remote initiating connections.
Port No (10001) ?
The default setting for Port 1 is 10001. The range is 1-65535, except for the following reserved
port numbers:
Table 8-5. Reserved Port Numbers
Port Numbers Reserved for
1 – 1024 Reserved (well known ports)
9999 Telnet setup
14000-14009 Reserved for Redirector
30704 Reserved (77F0h)
30718 Reserved (77FEh)
WARNING: We recommend that you not use the reserved port numbers for this
setting as incorrect operation may result.

Use Port 0 for the outgoing local port to change with each connection. The port range is 50,000 to
59,999. Each subsequent connection increments the number by 1 (it wraps back around to
50,000).
Only use this automatic port increment feature to initiate a connection using TCP. Set the port to
a non-zero value when the unit is in a passive mode or when using UDP instead of TCP.
Connect Mode
Connect Mode defines how the unit makes a connection, and how it reacts to incoming
connections over the network.
ConnectMode (C0) ?
Enter Connect Mode options in hexadecimal notation.
Table 8-6. Connect Mode Options
Connect Mode Option 7 6 5 4 3 2 1 0
a) Incoming Connection
Never accept incoming 0 0 0
Accept with active Modem Control In 0 1 0
Always Accept 1 1 0
b) Response
Nothing (quiet) 0
Character response (C=connect,
D=disconnect, N=unreachable)
1
c) Active Startup
No active startup 0 0 0 0
With any character 0 0 0 1
With active Modem Control In 0 0 1 0
With a specific start character 0 0 1 1
Manual connection 0 1 0 0
Autostart 0 1 0 1
Hostlist 0 0 1 0
d) Datagram Type
Directed UDP 1 1 0 0
e) Modem Mode
No Echo 0 0 1 1

Connect Mode Option 7 6 5 4 3 2 1 0
Data Echo & Modem Response
(Numeric)
0 1 1 1 1
Data Echo & Modem Response
(Verbose)
0 1 1 1 0
Modem Response Only (Numeric) 0 0 1 1 1 1
Modem Response Only (Verbose) 0 0 1 1 1 0
a) Incoming Connection
Incoming Connection Mode Description
Never Accept Incoming Rejects all external connection attempts.
Accept with active Modem
Control In
Accepts external connection requests only when the Modem
Control In input is asserted. Cannot be used with Modem Mode.
Always Accept Accepts any incoming connection when a connection is not
already established. Default setting.
b) Response
Response Mode Description
Character Response A single character is transmitted to the serial port when there is a
change in connection state:
C = connected, D = disconnected, N = host unreachable.
The IP address of the host connecting to the CoBos device will
be provided when you use verbose mode.
This option is overridden when the Active Start Modem Mode
or Active Start Host List is in effect. Default setting is Nothing
(quiet).
c) Active Startup
Active Startup Mode Description
No Active Startup Does not attempt to initiate a connection under any
circumstance. Default setting.
With Any Character Attempts to connect when any character is received from the
serial port.
With active Modem Control
In
Attempts to connect when the Modem Control In input changes
from not asserted to asserted.
With a Specific Start
Character
Attempts to connect when it receives a specific start character
from the serial port. The default start character is carriage return.

Table 8-7. Manual Connection Address Example
Command String Result if remote IP is 129.1.2.3 and remote port is 1234
C121.2.4.5/1
Complete override; connection is started with host 121.2.4.5,
port 1
C5 Connects to 129.1.2.5, port 1234
C28.10/12 Connects to 129.1.28.10, port 12
C0.0.0.0/0 Enters Monitor Mode
Cwww.lantronix.com/80 Tries to connect to the Lantronix web server if the
<hostname:domain> (www.lantronix.com) is configured in the
DNS server database.
Autostart (Automatic
Connection)
If you enable Autostart, the unit automatically connects to the
remote IP address & remote port specified when the firmware
starts.
Hostlist If you enable this option, the device server scrolls through the
hostlist until it connects to a device listed in the hostlist table.
Once it connects, the unit stops trying to connect to any others.
If this connection fails, the unit continues to scroll through the
table until it is able to connect to another IP in the hostlist.
Hostlist supports a minimum of 1 and a maximum of 12 entries.
Each entry contains the IP address and the port number.
The hostlist is disabled for Manual and Modem Modes. The unit
does not accept a data connection from a remote device when
the hostlist option is enabled.
Figure 8-2. Hostlist Option
Baudrate (9600) ?
I/F Mode (4C) ?
Flow (00) ?
Port No (10001) ?
ConnectMode (25) ?
Hostlist :
01. IP : 172.019.000.001 Port : 00023
02. IP : 172.019.000.002 Port : 03001
03. IP : 172.019.000.003 Port : 10001
Change Hostlist ? (N) ? Y
01. IP address : (172) .(019) .(000) .(001) Port : (23) ?
02. IP address : (172) .(019) .(000) .(002) Port : (3001) ?
03. IP address : (172) .(019) .(000) .(003) Port : (10001) ?
04. IP address : (000) .(000) .(000) .(000)
Hostlist :
01. IP : 172.019.000.001 Port : 00023
02. IP : 172.019.000.002 Port : 03001
03. IP : 172.019.000.003 Port : 10001
DisConnMode (00) ?
FlushMode (00) ?
SendChar 1 (00) ?
SendChar 2 (00) ?

To enable the hostlist:
1. Enter a Connect Mode of 0x20 (2X), where X is any digit. The menu shows you a list of
current entries already defined in the product.
2. To delete, modify, or add an entry, select Yes. If you enter an IP address of 0.0.0.0, that entry
and all others after it are deleted.
3. After completing the hostlist, repeat the previous step if necessary to edit the hostlist again.
4. For Retrycounter, enter the number of times the Lantronix unit should try to make a good
network connection to a hostlist entry that it has successfully ARPed. The range is 1-15, with
the default set to 3.
5. For Retrytimeout, enter the number of seconds the unit should wait before failing an
attempted connection. The time is stored as units of milliseconds in the range of 10-65535.
The default is 250.
d) Datagram Type
Datagram Type Description
Directed UDP When selecting this option, you are prompted for the Datagram type. Enter 01
for directed or broadcast UDP. Datagrams of type 01 can be sent as a
broadcast by enabling the Send as Broadcast option. The default is not to
broadcast. When the UDP option is in effect, the unit never attempts to initiate
a TCP connection because it uses UDP datagrams to send and receive data.
e) Modem Mode
In Modem (Emulation) Mode, the unit presents a modem interface to the attached serial device. It
accepts AT-style modem commands and handles the modem signals correctly.
Normally, there is a modem connected to a local PC and a modem connected to a remote
machine. A user must dial from the local PC to the remote machine, accumulating phone charges
for each connection. Modem Mode allows you to replace modems with Micro125 units, and to use
an Ethernet connection instead of a phone call. By not having to change communications
applications, you avoid potentially expensive phone calls.
To select Modem Mode, set the Connect Mode to C6 (no echo), D6 (echo with full verbose), D7
(echo with numeric response), CF (modem responses only, numeric response), or CE (modem
responses only, full verbose).
Note: If the unit is in Modem Mode, and the serial port is idle, the unit can still accept network
TCP connections to the serial port if Connect Mode is set to C6 (no echo), D6 (echo with full
verbose), D7 (echo with numeric response, CF (modem responses only, numeric response), or
CE (modem responses only, full verbose).
Table 8-8. Modem Modes
Modem Mode Description
Without Echo In Modem Mode, echo refers to the echo of all of the characters
entered in command mode; it does not mean to echo data that is
transferred. Quiet Mode (without echo) refers to the modem not
sending an answer to the commands received (or displaying what was
typed).

Data Echo & Modem
Response
Full Verbose: The unit echoes modem commands and responds to a
command with a message string shown in the table below.
Numeric Response: The unit echoes modem commands and
responds to a command with a numeric response.
Modem Responses
Only
Full Verbose: The unit does not echo modem commands and
responds to a command with a message string shown in the table
below.
Numeric Response: The unit does not echo modem commands and
responds to a command with a numeric response.
Table 8-9. Modem Mode Messages
Message Meaning
Full Verbose
OK Command was executed without error.
CONNECT A network connection has been established.
NO CARRIER A network connection has been closed.
RING n.n.n.n.
A remote device, having IP address n.n.n.n, is connecting to this
device.
Numeric Response
0 OK
1 Connected
2 Ring
3 No Carrier
4 Error
Received commands must begin with the two-character sequence AT and be terminated with a
carriage return character.
The unit ignores any character sequence received not starting with AT, and only recognizes and
processes single AT-style commands. The unit treats compound AT commands as unrecognized
commands.
If the Full Verbose option is in effect, the unit responds to an unrecognized command string that
is otherwise formatted correctly (begins with AT and ends with carriage return) with the "OK"
message and takes no further action.
If the Numeric Response option is in effect, the unit responds to an unrecognized command
string that is otherwise formatted correctly with the "OK" message and takes no further action.
When an active connection is in effect, the unit transfers data and does not process commands
received from the serial interface.
When a connection is terminated or lost, the unit reverts to command mode.
When an active connection is in effect, the unit terminates the connection if it receives the
following sequence from the attached serial device:
 No serial data is received for one second.
 The character sequence +++ is received, with no more than one second between each two
characters.

 No serial data is received for one second after the last + character. At this time, the unit
responds affirmatively per the selected echo/response mode.
 The character string ATH is received, terminated with a carriage return. The unit responds
affirmatively according to the selected echo/response mode and drops the network
connection. The serial interface reverts to accepting command strings.
If this sequence is not followed, the unit remains in data transfer mode.
Table 8-10. Modem Mode Commands
Modem Mode
Command
Function
ATDTx.x.x.x,pppp,
ATDTx.x.x.x/pppp, or
ATDTx.x.x.x:pppp
Makes a connection to an IP address (x.x.x.x) and a remote port
number (pppp).
ATDTx.x.x.x
Makes a connection to an IP address (x.x.x.x) and the remote port
number defined within the unit.
ATD0.0.0.0
Forces the unit into Monitor Mode if a remote IP address and port
number are defined within the unit.
ATD or ATDT
Forces the unit into Monitor Mode if a remote IP address and port
number are not defined within the unit.
ATDx.x.x.x
Makes a connection to an IP address (x.x.x.x) and the remote port
number defined within the unit.
ATH Hangs up the connection (Entered as +++ATH ).
ATS0=n
Enables or disables connections from the network going to the serial
port.
n=0 disables the ability to make a connection from the network to the
serial port.
n=1-9 enables the ability to make a connection from the network to
the serial port.
n>1-9 is invalid.
ATEn
Enables or disables character echo and responses.
n=0 disables character echo and responses.
n=1 enables character echo and responses.
ATVn
Enables numeric response or full verbose.
n=0 enables numeric response.
n=1 enables full verbose.
Note: The unit recognizes these AT commands as single commands such as ATE0 or ATV1; it
does not recognize compound commands such as ATE0V.
Send the Escape Sequence (+++) in Modem Mode
Disable or enable the Micro125’s ability to send the escape sequence. The default is Y (Yes)
(send the escape sequence).

Show IP addr after 'RING'
Show IP addr after 'RING' (Y) ?
Disable or enable the Micro125's ability to show the IP address after RING in Modem Mode. The
default is Y (Yes), to show the IP address.
Auto Increment Source Port
Y (Yes) auto increment the source port. The Micro125 increments the port number used with
each new connection.
Remote IP Address
This is the destination IP address used with an outgoing connection.
Remote IP Address : (000) .(000) .(000) .(000)
Note: This option does not display when Hostlist is enabled from the ConnectMode prompt (see
Connect Mode on page 44 for more information).
Remote Port
You must set the remote TCP port number for the unit to make outgoing connections. This
parameter defines the port number on the target host to which a connection is attempted.
Remote Port (0) ?
To connect an ASCII terminal to a host using the unit for login purposes, use the remote port
number 23 (Internet standard port number for Telnet services).
Note: This option does not display when Hostlist is enabled from the ConnectMode prompt (see
Connect Mode on page 44 for more information).
DisConnMode
This setting determines the conditions under which the unit will cause a network connection to
terminate.
DisConnMode (00) ?
Notes:
 In DisConnMode (Disconnect Mode), Modem Control In drop either drops the connection or
is ignored.
 All bit positions in the table that are blank represent “don’t care” bits, for that particular option,
which can be set to either a 0 or 1 value.
Table 8-11. Disconnect Mode Options
Disconnect Mode Option 7 6 5 4 3 2 1 0
Disconnect when Modem Control In is not asserted
(6)
1
Ignore Modem Control In 0

Disconnect Mode Option 7 6 5 4 3 2 1 0
Telnet Com Port Cntrl and terminal type setup
(1)
1
Channel (port) password
(2)
1
Hard disconnect
(3)
0
Disable hard disconnect 1
State LED off with connection
(4)
1
Disconnect with EOT (^D)
(5)
1
(1) The Telnet Com Port Control feature is used in conjunction with Com Port Redirector. The unit sends the
Terminal Type upon an outgoing connection.
(2) A password is required for a connection to the serial port from the network.
(3) The TCP connection closes even if the remote site does not acknowledge the disconnection.
(4) When there is a network connection to or from the serial port, the state LED turns off instead of blinking.
(5) When Ctrl+D or Hex 04 is detected, the connection is dropped. Both Telnet Com Port Cntrl and
Disconnect with EOT must be enabled for Disconnect with EOT to function properly. Ctrl+D is only
detected going from the serial port to the network.
(6) When Modem Control In transitions from a high state to a low state, the network connection to or from the
serial port drops.
Flush Mode (Buffer Flushing)
Using this parameter, you can control line handling and network buffers with connection startup
and disconnect.
FlushMode (00) ?
You can also select between two different packing algorithms.
Table 8-12. Flush Mode Options
Function 7 6 5 4 3 2 1 0
Input Buffer (Serial to Network)
Clear with a connection initiated from the device to the network 1
Clear with a connection initiated from the network to the device 1
Clear when the network connection to or from the device
is disconnected
1
Output Buffer (Network to Serial)
Clear with a connection initiated from the device to the network 1
Clear with a connection initiated from the network to the device 1
Clear when the network connection to or from the device
is disconnected
1
Alternate Packing Algorithm (Pack Control)
Enable 1

Pack Control
The packing algorithms define how and when packets are sent to the network. The standard
algorithm is optimized for applications in which the unit is used in a local environment, allowing for
very small delays for single characters, while keeping the packet count low. The alternate packing
algorithm minimizes the packet count on the network and is especially useful in applications in a
routed Wide Area Network (WAN). Adjusting parameters in this mode can economize the network
data stream.
Pack control settings are enabled in Flush Mode. Set this value to 00 if you do not need specific
functions.
Table 8-13. Pack Control Options
Option 7 6 5 4 3 2 1 0
Packing Interval
Interval: 12ms 0 0
Interval: 52ms 0 1
Interval: 250ms 1 0
Interval: 5sec 1 1
Trailing Characters
None 0 0
One 0 1
Two 1 0
Send Characters
2-Byte Send Character Sequence 1
Send Immediately After Send chars 1
Packing Interval
Packing Interval defines how long the unit should wait before sending accumulated characters.
This wait period is between successive network segments containing data. For alternate packing,
the default interval is 12 ms.
Trailing Characters
In some applications, CRC, Checksum, or other trailing characters follow the end-of-sequence
character; this option helps to adapt frame transmission to the frame boundary.

Send Characters
 If 2-Byte Send Character Sequence is enabled, the unit interprets the sendchars as a 2-
byte sequence; if this option is not enabled, the unit interprets them independently.
 If Send Immediately After Characters is not set, any characters already in the serial buffer
are included in the transmission after a "transmit" condition is found. If this option is set, the
unit sends immediately after recognizing the transmit condition (sendchar or timeout).
Note: A transmission might occur if status information needs to be exchanged or an
acknowledgment needs to be sent.
DisConnTime (Inactivity Timeout)
Use this parameter to set an inactivity timeout. The unit drops the the TCP connection to port
10001/10002* if there is no activity on the serial line before the set time expires. Enter time in the
format mm:ss, where m is the number of minutes and s is the number of seconds.
Note*: The default port number for Port 1 is 10001 and 10002 for Port 2. However, port
numbers may be set to a different value.
To disable the inactivity timeout, enter 00:00. Range is 0 (disabled) to 5999 seconds (99 minutes,
59 seconds). Default is 0.
Send Characters
Enter up to two characters in hexadecimal representation in sendchar.
SendChar 1 (00) ?
SendChar 2 (00) ?
If the unit receives a character on the serial line that matches one of these characters, it sends
the character immediately, along with any awaiting characters, to the TCP connection. This action
minimizes the response time for specific protocol characters on the serial line (for example, ETX,
EOT). Setting the first sendchar to 00 disables the recognition of the characters. Alternatively, the
unit can interpret two characters as a sequence (see Pack Control on page 52).
Telnet Terminal Type
This parameter displays only if you enabled the terminal type option in Disconnect Mode. With
this option enabled, you can use the terminal name for the Telnet terminal type. Enter only one
name.
With terminal type option enabled, the unit also reacts to the EOR (end of record) and binary
options, useful for applications like terminal emulation to IBM hosts.
Channel (Port) Password
This parameter appears only if the channel (port) password option is enabled in Disconnect
Mode. With this option enabled, you can set a password on the serial port.

9. Setup Mode: Advanced Settings
Expert Settings (Option 5)
Note: You can change the Enable alternate MAC setting using telnet or serial connections only. It
is not available through the Web-Manager.
CAUTION: Only an expert should change these parameters. You must definitely know the
consequences the changes might have.
Figure 9-1. Expert Settings
TCP Keepalive time in s (1s - 65s; 0s=disable): (45) ?
ARP Cache timeout in s (0s - 600s) : (600) ?
Disable Monitor Mode @ bootup (N) ?
HTTP Port Number : (80) ?
MTU Size (512 - 1400): (1400) ?
TCP Re-transmission Timeout (500 - 4000) (ms): (500) ?
Enable alternate MAC (N) ?
Ethernet connection type: (0) ?
The default settings are listed below:
Table 9-1. Expert Settings: Default Values
Device Details Settings Description
TCP Keepalive time in s
(1s – 65s; 0s=disable)
45
ARP Cache timeout in s (1s – 600s) 600
Disable Monitor Mode @ bootup No
HTTP Port Number (1-65535) 80
MTU Size (512 – 1400) 0 (resulting in an operational value of 1400)
TCP Re-Transmission Timeout (500-4000) 500 (msec)
Alternate MAC Disabled
Ethernet connection type Auto-negotiate
TCP Keepalive Time in Seconds
This option allows you to change how many seconds the unit waits during a silent connection
before attempting to see if the currently connected network device is still on the network. If the
unit gets no response, it drops that connection.
TCP Keepalive : 45s
ARP Cache Timeout in Seconds
Whenever the unit communicates with another device on the network, it adds an entry into its
ARP table. The ARP Cache timeout option allows you to define how many seconds (1-600) the
unit will wait before timing out this table.

9: Setup Mode: Advanced Settings
ARP cache timeout: 600s
Monitor Mode at Bootup
This option allows you to disable all entries into Monitor Mode during startup, except for the ‘xxx’
sequence. This prevents entry using yyy, zzz, xx1, and yy1 key sequences (only during the
bootup sequence). The default for Monitor Mode at bootup is N (No). (See 11: Monitor Mode.)
Monitor Mode @ bootup : enabled
HTTP Port Number
This option allows the configuration of the web server port number. The valid range is 1-
65535. The default HTTP port number is 80.
HTTP Port Number : 80
MTU Size
The Maximum Transmission Unit (MTU) is the largest physical packet size a network can transmit
for TCP and UDP. Enter between 512 and 1400 bytes. The default is 1400 bytes.
MTU Size: 1400
TCP Re-transmission Timeout
This feature allows the configuration of the desired TCP re-transmission timeout value. If the
ACK is not received for a packet sent from the Micro125 device, then the unit will retransmit the
data. The valid range is 500-4000 msec.
TCP Re-transmission timeout: 500 ms
If necessary, enable the alternate MAC address (if specified in the OEM setup record).
Enable alternate MAC (N) ? _
Ethernet Connection Type
The Micro125 allows for the Ethernet speed and duplex to be manually configured. Enter 0 for
auto-negotiation (default). To select the speed and duplex, enter one of the following: 2
(10Mbit/half duplex), 3 (10Mbit/full duplex), 4 (100Mbit/half duplex), or 5 (100Mbit/full duplex).
Ethernet connection type: auto-negotiate
Security Settings (Option 6)
Note: You can change security settings by means of Telnet or serial connections only, not on the
Web-Manager. We recommend that you set security over the dedicated network or over the serial
setup to prevent eavesdropping.
CAUTION: Disabling both Telnet Setup and Port 77FE will prevent users from
accessing the setup menu from the network. Disabling Port 77FE also disables the
Web from configuring the device.
Select 6 to configure security settings.

Figure 9-2. Security Settings
Disable SNMP (N) ?
SNMP Community Name (public):
Disable Telnet Setup (N) ?
Disable TFTP Firmware Update (N) ?
Disable Port 77FEh (N) ?
77FEh Access Mode (0=Read & Write, 1=Read Only): (0) ?
Disable Web Server (N) ?
Disable Web Setup (N) ?
Disable ECHO ports (Y) ?
Enable Encryption (N) ?
Enable Enhanced Password (N) ?
Disable SNMP
This setting allows you to disable the SNMP protocol on the unit for security reasons.
Disable SNMP (N) ?
SNMP Community Name
The SNMP Community Name is a required field for NMS to read or write to a device. Enter a
string of 1 to 13 characters.
SNMP Community Name (public):
The default entry is public. The current value is displayed in parentheses.
Disable Telnet Setup
Note: If you choose to disable this option, keep in mind that disabling both Telnet Setup and Port
77FE will prevent users from accessing the setup menu from the network.
This setting defaults to the N (No) option. The Y (Yes) option disables access to Setup Mode by
Telnet (port 9999). It only allows access locally using the web pages and the serial port of the
unit.
Disable Telnet Setup (N) ?
Disable TFTP Firmware Upgrade
This setting defaults to the N (No) option. The Y (Yes) option disables the use of TFTP to perform
network firmware upgrades. With this option, you can download firmware upgrades over the serial
port using the DeviceInstaller application’s Recover Firmware procedure. (See 10: Firmware
Upgrades.)
Disable TFTP Firmware Update (N) ?

Disable Port 77FE (Hex)
If you choose to disable this option, keep in mind that disabling both the Telnet Setup and Port
77FE will prevent users from accessing the setup menu from the network. Port 77FE is a setting
that allows DeviceInstaller, WebManager, and custom programs to configure the unit remotely.
You may wish to disable this capability for security purposes.
Disable Port 77FEh (N) ?
Note: The default setting is the N (No) option, which enables remote configuration. You can
configure the unit by using the DeviceInstaller utility, web pages, Telnet, or serial configuration.
The Y (Yes) option disables remote configuration and web sites. The Y (Yes) option also disables
many of the GUI tools for configuring the unit, including the embedded WebManager tool.
77FEh Access Mode
Configuring this setting is available if port 77FE is enabled. This option will not be listed if port
77FE is disabled.
Set 0 for Read & Write mode, and 1 for Read Only mode. Default value of this setting is Read-
Write(0).
If access mode is Read-only, then read operation can be done through port 77FE, if Read-Write
access is selected, then both read and write of data can be done through port 77FE.
77FEh Access Mode (0=Read & Write, 1=Read Only): (0) ? _
Disable Web Server
This setting defaults to the N (option). The Y (Yes) option disables the web server.
Disable Web Server (N) ?
Disable Web Setup
The Y (Yes) option disables configuration using the Web-Manager. This setting defaults to the N
(option).
Disable Web Setup (N) ?
Disable ECHO Ports
This setting controls whether port 7 echoes characters it receives.
Disable ECHO ports (Y) ?
Enable Encryption
Rijndael is the block cipher algorithm chosen by the National Institute of Science and Technology
(NIST) as the Advanced Encryption Standard (AES) to be used by the US government. The
Micro125 supports 128-, 192-, and 256-bit encryption key lengths.
Note: Configuring encryption should be done through a local connection to the serial port of the
Micro125, or via a secured network connection. Initial configuration information, including the
encryption key, is sent in clear text over the network.

To configure AES encryption on the Micro125:
Enable Encryption (N) Y
Key length in bits (0): 128
Change Keys (N) Y
Enter Keys: **-**-**-**-**-**-**-**-**-**-**-**-**-**-**-**-
1. When prompted to enable encryption, select Y.
2. When prompted, enter the encryption key length. The Micro125 supports 128-, 192-, and
256-bit encryption key lengths.
3. When prompted to change keys, select Y.
4. At the Enter Keys prompt, enter your encryption key. The encryption keys are entered in
hexadecimal. The hexadecimal values are echoed as asterisks to prevent onlookers from
seeing the key. Hexadecimal values are 0-9 and A-F.
 For a 128-bit key length, enter 32 hexadecimal characters.
 For a 192-bit key length, enter 48 hexadecimal characters.
 For a 256-bit key length, enter 64 hexadecimal characters
5. Continue pressing Enter until you return to the Change Setup menu.
6. From the Change Setup menu, select option 9 to save and exit.
Encryption only applies to the port selected for data tunneling (default 10001), regardless of
whether you are using TCP or UDP.
Generally, one of these situations applies:
 Encrypted Micro125-to-Micro125 communication. Be sure to configure both Micro125 devices
with the same encryption key.
 Third-party application to Micro125-encrypted communication: Micro125 uses standard AES
encryption protocols. To communicate successfully, products and applications on the peer
side must use the same protocols and the same encryption key as the Micro125.
 Lantronix Secure Com Port Redirector provides an encrypted connection from Windows-
based applications to the Micro125. Information about SCPR is available on our web site,
www.lantronix.com/device-networking/utilities-tools/scpr. A 30-day trial version of SCPR is
available.
Note: Developers can license the Lantronix Encryption Library Suite.
See www.lantronix.com/device-networking/utilities-tools.
Enable Enhanced Password
The Enhanced Password setting allows you to set a password of up to 16 characters for
protecting Telnet and Web Page access. We recommend that you select the Y (Yes) option and
enable the enhanced password setting.
Avoid using either the 4 character basic password setting or no password at all as they are not
secure options.
Enable Enhanced Password (N) ?

Default Settings (Option 7)
Select 7 to reset the unit’s channel configuration and expert settings to the default settings. The
server configuration settings for IP address, gateway IP address, and netmask remain
unchanged. The specific settings that this option changes are listed below:
Channel 1 and Channel 2 Configuration Defaults
Channel Setting Default Configuration
Baudrate 9600
I/F Mode 4C (1 stop bit, no parity, 8 bit, RS-232C)
Flow 00 (no flow control)
Port number 10001 (channel 1)
10002 (channel 2)
Connect Mode C0 (always accept incoming connection; no active
connection startup)
Send '+++' in Modem Mode Enabled
Show IP addr after 'RING' Enabled
Auto increment source port Disable
Hostlist retry counter 3
Hostlist retry timeout 250 (msec)
Start character for serial channel 1 0x0D (CR)
All other parameters 0
Expert Settings Defaults
Expert Setting Default Configuration
TCP Keepalive time in s 45
ARP Cache timeout in s 600
Disable Monitor Mode @ bootup No
HTTP Port Number 80
MTU Size 0 (resulting in an operational value of 1400)
TCP Re-Transmission Timeout
(500-4000)
500 (ms)
Alternate MAC Disabled ( for OEM use only)
Ethernet Connection Type 0 (auto-negotiate)
Security Settings Defaults
Security Setting Default Configuration
Disable SNMP No
SNMP community name public

Security Setting Default Configuration
Disable Telnet setup No
Disable TFTP Firmware Update No
Disable Port 77FEh No
Disable Web Server No
Disable Web Setup No
Disable ECHO ports Yes
Enable Encryption No
Enable Enhanced Password No

10. Firmware Upgrades
Obtaining Firmware
You can obtain the most up-to-date firmware and release notes for the unit from the Lantronix
web site (www.lantronix.com/support/downloads) or by using anonymous FTP
(ftp.lantronix.com/pub).
Reloading Firmware
There are several ways to update the unit's internal operational code (*.ROM): using the
DeviceInstaller utility (the preferred way), using TFTP, or using the serial port. You can also
update the unit's internal Web interface (*.COB) using TFTP or the DeviceInstaller application.
Here are typical names for those files. Check the Lantronix web site for the latest versions and
release notes.
Table 10-1. Firmware Files
ROM File COB
m125e_61100.rom m125_webm_2007.cob
Please refer to the DeviceInstaller online Help for information about reloading firmware using the
DeviceInstaller application. The other methods are discussed below.
Using TFTP: Graphical User Interface
To download new firmware from a computer:
1. Use a TFTP client to put a binary file to the unit (*.ROM to upgrade the unit's internal
operational code and *.COB to upgrade its internal web interface).
Note: TFTP requires the .rom (binary) version of the unit's internal operational code.
2. In the TFTP server field, enter the IP address of the unit being upgraded.
3. Select Upload operation and Binary format.
4. Enter the full path of the firmware file in the Local file name field.
5. In the Remote file name field, enter the current internal operational code or WEB1 to WEB6
for the internal web interface.

10: Firmware Upgrades
Figure 10-1. TFTP Window
6. Click the Upload Now button to transfer the file to the unit. The unit performs a power reset
after the firmware has been loaded and stored.
Using TFTP: Command Line Interface
To download new firmware from a computer:
7. Enter the following from a TFTP command line interface:
tftp –i <ip address> put <local filename> <destination file name>
The following examples demonstrate the TFTP command sequence to download the .rom file and
the .cob file:
tftp –i 192.168.1.111 put m125e_61100.rom 5M
tftp –i 192.168.1.111 put m125_webm_2007.cob WEB1
Recovering the Firmware Using the Serial Port and the
DeviceInstaller Application
If for some reason the firmware is damaged, you can recover the firmware file by using the
DeviceInstaller utility to download the *.ROM file over the serial port.
To recover firmware:
1. Start DeviceInstaller. If your PC has more than one network adapter, a message displays.
Select an adapter and click OK.
2. From the Tools menu, select Advanced/Recover Firmware. The Serial Port Firmware
Upgrade window displays.
3. For Port on PC, enter the COM port on the PC that is connected to the serial port of the
Lantronix unit.
Note: Make sure the Micro125 on which you are recovering firmware is connected to this
selected port on your PC.
4. For Device Model, be sure the appropriate Micro125 device is selected.
5. For Firmware File, click the Browse button and go to the location where the firmware file
resides.

10: Firmware Upgrades
6. Click OK to download the file.
7. When prompted, reset the device. Status messages and a progress bar at the bottom of the
screen show the progress of the file transfer. When the file transfer completes, the message
“Successful, Click OK to Close” appears.
8. Click the OK button to complete this procedure.
Note: For more information, see Recovering Firmware in the DeviceInstaller online Help.

11. Monitor Mode
Monitor Mode is a command-line interface used for diagnostic purposes.
There are two ways to enter Monitor Mode: locally using the serial port or remotely using the
network.
Entering Monitor Mode Using the Serial Port
To enter Monitor Mode locally:
1. Follow the same steps used for setting the serial configuration parameters
(see Serial Port on page 37).
2. Instead of typing three x keys, however:
3. Type zzz (or xx1) to enter Monitor Mode with network connections.
4. Type yyy (or yy1) to enter Monitor Mode without network connections.
A 0> prompt indicates that you have successfully entered Monitor Mode.
Entering Monitor Mode Using the Network Port
To enter Monitor Mode using a Telnet connection:
5. Establish a Telnet session to the configuration port (9999). The following message appears:
MAC address 12D4AE4A20AA
Software version V6.11.0.0 (150522) M125
Press Enter for Setup Mode
6. Type M (upper case).
A 0> prompt indicates that you have successfully entered Monitor Mode.
Monitor Mode Commands
The following commands are available in Monitor Mode. Many commands have an IP address as
an optional parameter (xxx.xxx.xxx.xxx). If you enter the IP address, the command is applied to
another unit with that IP address. If you do not enter the IP address, the command is executed
locally.
Note: All commands must be in capital letters. Responses to some of the commands are in Intel
Hex format.

11: Monitor Mode
Table 11-1. Monitor Mode Commands
Command Command Name Function
VS x.x.x.x Version Queries software header record (16 bytes) of unit with
IP address x.x.x.x.
GC x.x.x.x Get Configuration Gets configuration of unit with IP address x.x.x.x as
hex records (120 bytes).
SC x.x.x.x Send Configuration Sets configuration of unit with IP address x.x.x.x from
hex records.
PI x.x.x.x Ping Pings unit with IP address x.x.x.x to check device
status.
AT ARP Table Shows the unit’s ARP table entries.
TT TCP Connection Table Shows all incoming and outgoing TCP connections.
NC Network Connection Shows the unit’s IP address, gateway, subnet mask,
and DNS server.
RS Reset Resets the unit’s power.
QU Quit Exits diagnostics mode.
G0, G1,
....,Ge, Gf
Get configuration from
memory page
Gets a memory page of configuration information
from the device.
S0, S1,...,Se,
Sf
Set configuration to
memory page
Sets a memory page of configuration information on
the device.
GM Get MAC address Shows the unit's 6-byte MAC address.
SS Set Security record Sets the Security record without the encryption key
and length parameters. The entire record must still be
written, but the encryption-specific bytes do not need
to be provided (they can be null since they are not
overwritten).
SA Scan Initiates a wireless scan if the wireless interface is
enabled. Reports any stations found, including
BSSID, SSID, and RSSI. If SA is followed by a string,
the string is used to filter SSIDs before reporting. If
the BSS does not broadcast its SSID, only the BSSID
and RSSI are returned.
NS Network Status Reports the network interfaces’ statuses. Includes
potentially negotiated parameters like speed/duplex
for Ethernet or BSSID, encryption, authentication for
wireless interfaces.
co Set IP address,
hostbits, gateway ,
and DNS server IP
Example:
co 192.168.0.10 8 192.168.0.1 10001 192.168.1.10
with
192.168.0.10 = IP address of the Micro125
8 = number of hostbits
192.168.0.1 = gateway IP address
10001 = port number of the Micro125
192.168.1.10 = IP address of the DNS Server
The Micro125 stores the setup and performs a reset.
It sends an X before the reset if the command was
OK.
VN Query full firmware
version
This command queries and displays full firmware
version in readable string format.

11: Monitor Mode
Command Command Name Function
WC Flash write count This command shows serial flash write counts, valid
on serial flash products.
Note: Entering any of the commands listed above generates one of the following command
response codes:
Table 11-2. Command Response Codes
Response Meaning
0> OK; no error
1> No answer from remote device
2> Cannot reach remote device or no answer
8> Wrong parameter(s)
9> Invalid command

12. Troubleshooting
This chapter discusses how you can diagnose and fix errors quickly without having to contact a
dealer or Lantronix. It helps to connect a terminal to the serial port while diagnosing an error to
view summary messages that may display. When troubleshooting, always ensure that the
physical connections (power cable, network cable, and serial cable) are secure.
Note: Some unexplained errors might be caused by duplicate IP addresses on the network. Make
sure that your unit's IP address is unique.
When troubleshooting the following problems, make sure that the Micro125 is powered up.
Confirm that you are using a good network connection.
Problems and Error Messages
Problem/Message Reason Solution
When you issue the ARP –S
command in Windows, the
"ARP entry addition failed: 5"
message displays.
Your currently logged-in user
does not have the correct rights
to use this command on this
PC.
Have someone from your IT
department log you in with
sufficient rights.
When you attempt to assign an
IP address to the unit by the
ARP method, the "Press Enter
to go into Setup Mode" error
"(described below) message
displays. Now when you Telnet
to the device server, the
connection fails.
When you Telnet to port 1 on
the device server, you are only
assigning a temporary IP
address. When you Telnet into
port 9999 and do not press
Enter quickly, the device server
reboots, causing it to lose the IP
address.
Telnet back to Port 1. Wait for it
to fail, then Telnet to port 9999
again. Make sure you press
Enter quickly.
When you Telnet to port 9999,
the "Press Enter to go into
Setup Mode" message displays.
However, nothing happens
when you press Enter, or your
connection is closed.
You did not press Enter quickly
enough. You only have 5
seconds to press Enter before
the connection is closed.
Telnet to port 9999 again, but
press Enter as soon as you see
the "Press Enter to go into
Setup Mode" message.
When you Telnet to port 1 to
assign an IP address to the
device server, the Telnet
window does not respond for a
long time.
You may have entered the
Ethernet address incorrectly
with the ARP command.
Confirm that the Ethernet
address that you entered with
the ARP command is correct.
The Ethernet address may only
include numbers 0-9 and letters
A-F. In Windows and usually in
Unix, the segments of the
Ethernet address are separated
by dashes. In some forms of
Unix, the Ethernet address is
segmented with colons.
The IP address you are trying to
assign is not on your logical
subnet.
Confirm that your PC has an IP
address and that it is in the
same logical subnet that you
are trying to assign to the
device server.

12: Troubleshooting
The device server may not be
plugged into the network
properly.
Make sure that the Link LED is
lit. If the Link LED is not lit, then
the device server is not properly
plugged into the network.
When you try to assign an IP
with the DeviceInstaller
application, you get the
following :
"No response from device!
Verify the IP, Hardware
Address and Network Class.
Please try again."
The cause is most likely one of
the following:
The hardware address you
specified is incorrect.
The IP address you are trying to
assign is not a valid IP for your
logical subnet.
You did not choose the correct
subnet mask.
Double-check the parameters
that you specified.
Note: You cannot assign an IP
address to a device server
through a router.
The device server is not
communicating with the serial
device to which it is attached.
The most likely reason is the
wrong serial settings were
chosen.
The serial settings for the serial
device and the device server
must match. The default serial
settings for the device server
are RS-232, 9600 baud, 8
character bits, no parity, 1 stop
bit, no flow control.
When you try to enter the setup
mode on the device server
using the serial port, you get no
response.
The issue is most likely
something covered in the
previous problem, or possibly,
you have Caps Lock on.
Double-check everything in the
problem above. Confirm that
Caps Lock is not on.
You can ping the device server,
but not Telnet to the device
server on port 9999.
There may be an IP address
conflict on your network
You are not Telneting to port
9999.
The Telnet configuration port
(9999) is disabled within the
device server security settings.
Turn the device server off and
then issue the following
commands at the DOS prompt
of your computer:
ARP -D X.X.X.X (X.X.X.X is the
IP of the device server).
PING X.X.X.X (X.X.X.X is the IP
of the device server).
If you get a response, then
there is a duplicate IP address
on the network. If you do not
get a response, use the serial
port to verify that Telnet is not
disabled.

12: Troubleshooting
The device server appears to
be set up correctly, but you are
not communicating with your
device attached to the device
server across the network.
If you are sure that the serial
port setting is correct, then you
may not be connecting to the
correct socket of the device
server.
Another possibility is that the
device server is not set up
correctly to make a good socket
connection to the network.
You can check to see whether
there is a socket connection to
or from the device server by
looking at the Status LED.
If the Status LED is blinking
consistently, then there is a
good socket connection.
If the Status LED is solid green,
then the socket connection
does not exist. Use the
Connect Mode option C0 for
making a connection to the
device server from the network.
Use Connect Mode option C1
or C5 for a connection to the
network from the device server.
See the full list of Connect
Mode options in Connect Mode
on page 44.
When connecting to the Web-
Manager within the device
server, the "No Connection With
The Device Server" message
displays.
Your computer is not able to
connect to port 30718 (77FEh)
on the device server.
Make sure that port 30718
(77FEh) is not blocked with any
router that you are using on the
network. Also, make sure that
port 77FEh is not disabled
within the Security settings of
the device server.

A: Lantronix Technical Support
Lantronix offers many resources to support our customers and products at
http://www.lantronix.com/support. For instance, ask a question, find firmware downloads, access
the FTP site and search through tutorials, FAQs, bulletins, warranty information, extended
support services, and product documentation.
To contact technical support or sales, look up your local office at
http://www.lantronix.com/about/contact.html. When you report a problem, please provide the
following information:
 Your name, company name, address, and phone number
 Lantronix product and model number
 Lantronix MAC number or serial number
 Firmware version and current configuration
 Description of the problem
 Status of the unit when the problem occurred (please try to include information on user and
network activity at the time of the problem).

B: Binary to Hexadecimal Conversions
Many of the unit’s configuration procedures require assembling a series of options (represented
as bits) into a complete command (represented as a byte). Convert the resulting binary value to a
hexadecimal representation.
Converting Binary to Hexadecimal
Following are two simple ways to convert binary numbers to hexadecimals.
Conversion Table
Hexadecimal digits have values ranging from 0 to F, which are represented as 0-9, A (for 10), B
(for 11), etc. To convert a binary value (for example, 0100 1100) to a hexadecimal representation,
the upper and lower four bits are treated separately, resulting in a two-digit hexadecimal number
(in this case, 4C). Use the following table to convert values from binary to hexadecimal.
Decimal Binary Hex
0 0000 0
1 0001 1
2 0010 2
3 0011 3
4 0100 4
5 0101 5
6 0110 6
7 0111 7
8 1000 8
9 1001 9
10 1010 A
11 1011 B
12 1100 C
13 1101 D
14 1110 E
15 1111 F

B: Binary to Hexadecimal Conversions
Scientific Calculator
Another simple way to convert binary to hexadecimals is to use a scientific calculator, such as the
one available on Windows operating systems. For example:
1. On the Windows Start menu, click ProgramsAccessoriesCalculator.
2. On the View menu, select Scientific. The scientific calculator displays.
3. Select Bin (Binary), and type the number to convert.
4. Click Hex. The hexadecimal value displays.

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