You need write arduino code communicate with the modbus device

Arduino MODBUS RS485 Setup- Modb Poll/Slave (Homework)

Your question:

Wiring:

1. Connect RS485 to Arduino: Connect the A+ and B- terminals of your MODBUS RS485 device to the RS485 module. Connect the GND terminal of your RS485 device to the GND of the Arduino.

MODBUS RS485 Device

A+ --------------- A+ on RS485 Module

Coding:

Next, you'll need to write Arduino code to communicate with the MODBUS device. To do this, you can use a MODBUS library like "ModbusMaster" available on the Arduino platform. Here are the general steps:

2. Write Arduino Code:

#include <ModbusMaster.h>

}

void loop() {

// Data received, process it

int value1 = node.getResponseBuffer(0); // Get the first register value

Serial.print("Value 1: ");

Serial.println(value1);

}

This code initializes communication with the MODBUS device, reads two holding registers, and performs actions based on the received values. You can modify the code to suit your specific requirements.