Modbus is used in monitoring to communicate between intelligent devices, sensors or instruments and to monitor field devices using computer and HMI. Modbus is an open protocol, meaning that it’s free for manufacturers to communicate between electronics devices. In simple terms, it is a method used for transmitting information over serial lines between electronic devices. Modbus is a serial communication protocol developed by Modicon in 1979. Let us start with some basics understanding of Modbus Protocol: What is Modbus Protocol? In this user guide, we will explore some basic concept of Modbus protocol, Interfacing of RS485 Module with ESP32 board, MAX485 TTL To RS485 Module and finally will prepare simple code to read the data over ESP32 serial port using SoftwareSerial Library. This tutorial, we will learn how to handle Modbus RTU RS485 Protocol with ESP32 board using Arduino IDE.
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