Modbus RTU 4 Way Relay Module DIY STM8S103 System 4 Road Input 485 Communication

4 channel relay output (a normally open, normally closed)
STM8S103F3 microcontroller
4 way optical coupling isolation
4 relay closed the LED light
Circular DC interface, and DC terminal interface.Convenient power connection (5 v or 12 v power supply voltage according to the voltage relay decision)
4 road input interface
All the RS485 communication interface.
A power indicator light
A user LED lights
Reset button

Modbus RTU 指令

波特率(Baud rate) ：9600  8 NONE 1


(No. 1 relay close)

01 06 00 01 01 00 d9 9a

(No. 1 relay open)

01 06 00 01 01 01 18 5a


(No. 2 relay close)

01 06 00 01 02 00 d9 6a

(No. 1 relay open)

01 06 00 01 02 01 18 aa


(No. 3 relay close)

01 06 00 01 03 00 d8 fa

(No. 1 relay open)

01 06 00 01 03 01 19 3a


(No. 4 relay close)

01 06 00 01 04 00 da ca

(No. 1 relay open)

01 06 00 01 04 01 1b 0a


(All put out)

01 06 00 01 00 00 d8 0a

(All light)

01 06 00 01 ff ff d9 ba

(Set the address)

01 06 00 02 00 XX 1b 0a

(Read the address)

00 03 00 02 00 XX 1b 0a