Dsa244 B Um

Display Programmer’s Guide 07 Feb 07

Alphanumeric Display
Programmer’s Guide
This document describes the programming of the
alphanumeric displays with graphics capabilities.
The first commands discussed are the text
commands starting with simply writing text to the
display then progressing through scrolling the
display, setting the text and back ground colors,
finishing with writing display information to DA-244 DA-248 DA478A
memory and reading the information back to the Width 32 64 40
display. The second section of the document [Pixels]
covers the graphics commands used on the Height 8 8 7
display. [Pixels]
Text 20 64 20
Connection and Communication Display Characters Characters Characters
The displays are to be driven from an RS422 Buffer
source with both transmit (TX) and receive (RX) Text 15 Text 63 Text 15 Text
connections. An example is using the Alzatex Storage plus plus plus
PS422A1 to drive the display and an RS232 Buffer 1 Control 1 Control 1 Control
interface such as a hyperterminal to drive the Graphics
PS422A1. Power is provided to the display from Buffer 8 x 32 8 x 64 7 x 40
the RS422 connection. Do not connect power to [Pixels]
the power jack in the back of the display.
Displays can be daisy-chained together to form a
system of displays all controlled by the same Text Commands
serial port.
Commands are common to all three
configurations. Commands are in capital (upper
General Configurations. case) letters and are in many cases preceded by
There are three configurations of these displays; the quote character (“).
the DA-244, the DA-248, and the DA-478A.
The DA-244 Display is 8 pixels by 32 pixels. Command DSPxxxx
The DA-248 is 8 pixels by 64 pixels. The DA-
The command DSP will write characters to all
478A is 7 pixels by 40 pixels.
displays at one time. In a single display
configuration there is no difference between this
command and the command to direct characters
to a specific address to display (The “Ln
command). The exception is if the address in the
“Ln command is not the address of the display.

Command “Lnxxxx
Command “Lnxxxx will write up to 20 characters
to one of 32 display addresses n (n has potential
values of 0-9, A-O {note, capital letters only},
and the characters : ; < = > ? @). For example to
write “Hello” to address 2 use the command:
“L2Hello
In a single display system this is identical to the
DSP command, except that the DSP will force a
display even if the intended address s is not the
address of the display.

Version=1 1 www.alzatex.com


The default address of a display is zero (“0”) but Command RLY01P1
can be changed with the configuration button. This command is used to operate an external
Refer to the Configuration Button for instructions device by closing a switch to ground. The switch
about setting the display’s address. will handle up to a maximum 0.25 Amperes at
12V or the power supply value. This is used to
drive a relay to activate a higher current device
Command “Cn such as a beeper, a siren, or a light.
Contact Alzatex, Inc. for further information.
This command is used to control scrolling
through the display. There are four versions of
this command; “C@, “CA, “CB, “CC. Command “KPz
This command is used to write from the text
“C@ sets to “NO SCROLLING” where the display to memory or read from memory to the
characters appear stationary on the screen. If the text display. Thus this command has two
display was scrolling the “C@ command stops ‘personalities’. There are 15 memory locations.
scrolling and puts the left most characters of the The memories are designated A through O or a
text into the display through o. In write mode the command is “KPa,
the lower case letter indicating that this is a write
“CA is called smooth scrolling. In this mode the to memory A. Reading from the same address
entire display buffer contents continue to scroll the command is “KPA, where the upper case
through the display in a continuous cycle. The letter indicates that this is a read. These
entire memory contents are scrolled through and commands are only used to store and recall text
finally off the screen, leaving a clear screen, in the EEPROM. Graphics are not stored.
before the new pass is started.
In addition, the memories of each display are
“CB scrolls through all the text and scrolls the independent of any other displays daisy chained
final characters off the end of the screen leaving together. The “KPA command on a daisy chain
a blank screen when the scrolling is completed. will display the contents of memory on each
It then reloads the display from the start of the display in the chain. But, the contents of memory
buffer, then pauses before starting to scroll again. A will be the information loaded into that
specific memory. At the factory, the memories
“CC scrolls through part of the text buffer and are preloaded with a capital letter that is the same
scrolls until the screen is filled with the last as the memory designation. For example,
characters in the memory. memory A is loaded with an “A”. In a similar
manner the write command “KPa will write the
Command RLY@ display of each unit on a daisy chain to the
memory A of each unit.
This command is used to set display text color
and background color. One issue to be aware of
Command “KPn can also be accessed through the
is that if the text color is the same as the
six pin connector RJ11. The RJ11 port has four
background color the text will be
lines that can be closed to ground (there are
indistinguishable. This is best avoided by
pullup resistors in the display).
setting the background color first and then the
character colors.
The connector pins on the RJ11 are assigned as
follows:
Setting Background Colors:
RLY@1 – Sets the background to green. Pin 6 is D4, the MSB
RLY@2 - Sets the background to yellow. Pin 5 is D2, the next bit
RLY@< - Sets the background to red. Pin 4 is ground
RLY@8 – Clears the background. Pin 3 is D1, the next bit
Pin 2 is a Voltage out 11V to 15V DC and
Setting Character Colors: less than 0.5 Amp.
RLY@A – Sets the characters to green. Pin 1 is D3, is the LSB
RLY@B – Sets the characters to yellow.
RLY@D – Sets the characters to red.



The switch closures activate a “KP{Upper Case
letter} where the binary code indicates the letter.
Hexadecimal 0 (0000 binary or all switches
open) is no change or no action. A switch setting
of 0001 or 1 Hex is equivalent to “KPA, 0010 is
equivalent to “KPB and so forth up to a 1111
which is equivalent to “KPO.

The following command sets are reserved for
future use:
“KPP “KPp
“KPQ “KPq
“KPR “KPr
“KPS “KPs
“KPT “KPt
“KPU “KPu
“KPV “KPv
“KPW “KPw

The procedure for using the”KPx command is to
setup the display buffer Text with the DSP
command or the “Lnxxx command, then set the
text color and/or background color(s) with the
RLY@ command. Then, if desired, set the
scrolling command. The last step is to save the
display buffer into memory, for example memory
A, using the “KPa. Once one or more displays
are saved each can be recalled using the
command “KPA.



Graphics Commands: A second example is a 4 wide by 6 high graphic
using the command:
The following three commands deal with placing
"G0406fa5e6d9fa5e6
graphics onto the display. These commands are
“X, “G, and “B. One issue to keep in mind is
that there are two graphic buffers driving the
display and it might be necessary to execute the
command twice or write the image twice to get
the desired buffer to display.

Command “G
This command is used to load in graphics display
into the memory. The “G command uses only
legal ASCII characters. These cannot be stored
into EEPROM.
The command format is:
“Gxxyyabcdabcdabcd
Where xx is the width across
(in multiples of 2 pixels only)
yy is the height down (up to 8 on
a single line display)
abcd is the Hex code for the colors
This would read as 2 Reds(F), 2 Yellows(A), 2
Each letter (a, b, c, or d) is
Greens(5), Yellow Red pair(E), Yellow Green
the code for two pixels.
pair(6), Green Red pair(D), Green Yellow
the settings of the individual pixels is set two at a
pair(9) then repeat (Arrow points to repeat start)
time or bytewise. The color coding is:
00 – blank
If the screen becomes garbled use the DSP
01 – Green
command with no text to clear the screen
10 – Yellow
followed by a “G0707000000000000000
11- Red
(lots of zeros) command executed twice to clear
For example, the easiest command to start with
the graphics buffers.
is:
“G02026D
This would match the above form as: Command “X
“Gxxyyab This command controls the position of the
This gives a two pixel wide and two pixel high graphics and is used in combination with the “G
pattern where the hexadecimal 6 decomposes and the “B commands.
into 01 and 10 in binary which is a Yellow pixel The format is
and a Green pixel. Below this the hex D which
decodes to a 11 and 01 which turns on a Green “Xxxyy
pixel and a Red Pixel. Where xx is the right offset from the upper left
corner and yy is the downward offset from the
upper left corner. These values are in
hexadecimal. For example, to put the display in
the third position down the command would be:
“X0002
The limit on xx is 32,40, 64, or 128 depending
on how many units are linked together.
The limit on yy is 8 for a single line display or 16
for a double line. In reality, the yy limit is 06
because a 08 would cause the display to wrap
around.



Also note that the “X setting applies to BOTH
buffers. The X and Y parameters can use ASCII as
follows. Each takes the ASCII character, then
The effect of adding the “X command to move strips off left three (MSB) bits and uses the
the image down and left is shown in the remaining bits for the width. For example a
following example of the sequence: capital A has an ASCII code of 41. After
“X0202 removing the three most significant bits that
“G02026D leaves a binary 00001 or 1 wide or high.

Setting the pixel color works in a similar manner,
without dropping the three MSBs. For example
the character { has an ASCII binary of 01111011
or 7B in hex. This would turn on four pixels as
Green, Red, Yellow, Red.

Another example would be the command:
“BHDUUUUUUUU
Would turn an eight wide, four high area green.
(U in ASCII is 55 or 01010101, or four pixels of
green.)

Test and Configuration Button
Functions

The CONFIG button is located on the rear of the
unit near the connectors.
- To activate the
Note that the four colored pixels are moved down test/configuration mode hold
two and right two. the button down for three
seconds.
To move the graphics origin back to the upper - First to appear is the
left corner use the command Diagnostic Mode. If you
“X0000 continue to click, you will
followed by the appropriate “G command continue to cycle through the
set up modes.
Command “B - By pausing at a set up mode
This command is used to load in binary. If the for 3 seconds you then can
communication port can handle binary this is the choose the various values of
most efficient way to transmit the data. The that mode.
format is: - To exit the configuration
“Bxylhlhlhlhlh mode, either
Where: - perform any other operation or
x = the image width in a binary number of pixels - press and hold the mode button for 3
(in multiples of 4 pixels) seconds.
y = the image height in a binary number of pixels
(up to 8 on a single line display) Diagnostic Mode:
lhlhlh = The data to be displayed. Press and hold the CONFIG button for three
There are two bits per pixel as follows: seconds to enter the diagnostic test mode. One of
00 – blank four different displays will appear.
01 – Green
10 – Yellow
11 - Red



- First momentary press, 3 = Unused.
the Red-Green bi-color X will be displayed.
- Second momentary press, Setting the Unit Address:
All green LEDs will be displayed. For use with the "Lnxxxxx command.
- Third momentary press, - Press and hold the CONFIG button for 3
All yellow LEDs will be displayed. seconds.
- Fourth momentary press, -Press the CONFIG button four times to cycle
All red LEDs will be displayed. through the selections until the message.
- Fifth momentary press, "Addr 0" is displayed .
Repeat above sequence. - Wait 3 seconds.
- Press the CONFIG button to cycle through
Automatic sequencing of the test displays. each of the unit addresses.
- Press and hold the CONFIG button for - The unit addresses available are:
3 seconds, then release. 00-0F = 0123 4567 89:; <=>?
After one second, the display will automatically 10-1F = @ABC DEFG HIJK LMNO
cycle to the
next test display each second. Setting the baud rate:
-The sequence is: - Press and hold the CONFIG button for
Red-Green X; All green, All Yellow, All 3 seconds.
red; ...repeat... - Press the CONFIG button five times to cycle
through the selections until the message
Display the version number. "Baud 1" is displayed.
- Press and hold the CONFIG button for - Wait 3 seconds.
3 seconds. - Press the CONFIG button to cycle through each
- Press the CONFIG button one time to cycle of the baud rates.
through the selections until the message The baud rates for different settings are:
"Ver02", will be displayed. 0 = 1,200 Baud
1 = 2,400 Baud– the default value
Setting the Mode. 2 = 4,800 Baud
- Press and hold the CONFIG button for 3 = 9,600 Baud
3 seconds. 4 = 19,200 Baud
- Press the CONFIG button two times to cycle 5 = 38,400 Baud
through the selections until the message 6 = 56,800 Baud
"Mode 0" will be displayed. 7 = 115,200 Baud
- Wait 3 seconds.
- Press the CONFIG button to cycle through each
of the modes.
- NOTE: This setting is not implemented.

Setting the Beep Mode.
Beep Mode is not implemented.
- Press and hold the CONFIG button for
3 seconds.
- Press the CONFIG button three times to cycle
through the selections until the message
"Beep 1" will be displayed.
- Wait 3 seconds.
- Press the CONFIG button to
cycle through each of the beeper modes.
NOTE: This setting is not implemented.
The beeper modes are:
0 = Off.
1 = Beep on timer zero.
2 = Beep relay activated while
the timer is running.


Dsa244 B Um

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