BLIIOT Industrial Ethernet Remote I/O Module Application 20--How to Write to Multiple DO Outputs of I/O Module at the same time

Write to multiple DO outputs of this device at the same time

Master Send Data Format:

Receiver Return Data Format:

Example: Simultaneously close the 16 DOs of this device, then:

Server send: 01 0F 00 00 00 10 02 55 AA 5D 0F

01= Device address;

0F= Write multiple holding coils;

00 00=DO register starting address;

00 10 = Control 16 DOs of this device at the same time;

00 00=Number of data sent;

55 AA= DO status data sent, each bit represents a DO status, 0 represents open, 1 represents closed; the first byte 55H is converted into binary: 0101 0101, corresponding to DO1-DO8 status from low to high ; The second byte AAH is converted into binary system: 1010 1010, corresponding to the state of DO9-DO16 from low to high. The details are as follows:

5D 0F = CRC verify.

Device answer: 01 0F 00 00 00 10 54 07

01= Device address;

05= Write a single holding coil;

00 00= DO1 register starting address;

00 10 = 16 DO performed actions.

54 07 = CRC verify.

More information about Ethernet Remote I/O module: https://www.bliiot.com/modbus-tcp-io-modules-p00254p1.html