Controlling 8 Channel Relay Board Using Modbus Protocol and Arduino Uno As Slave

by rupjit81 in Circuits > Arduino

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Controlling 8 Channel Relay Board Using Modbus Protocol and Arduino Uno As Slave

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In this design Im going to show how to control 8 channel relay board using Modbus protocol. Im using Arduino Uno as a slave device in this project.

PC based software Modbus Poll is the master and it is giving command to the Arduino uno. Arduino Uno will process the command and trigger the relay.

Supplies

  1. Arduino uno 1 pc
  2. 8 channel relay board 1 pc
  3. Vero board 1 pc
  4. Jumper wires
  5. Modbus Poll software Download (modbustools.com)

Modbus write command implementation on relay board controlled by Arduino Uno
Modbus write command on relay board controlled by Arduino Uno
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Modbus Poll software is the Modbus master in this project. This is installed in a PC. This software transmits Modbus frame to control the Arduino Uno. The Arduino Uno being a slave device verifies the address, task and gives command to the relay board.

This is a tested project.

Software, circuit diagram, photos and videos are attached.

Downloads

modbus_write01_sketch_jul22a.ino