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Since this tutorial uses RS-485, it is recommended to first go through RS485 Serial Communication between Arduino Uno and Arduino Nano.

These LEDs and servo motor are connected with Slave Arduino and controlled by sending values using Master Modbus Software. Here we install Simply Modbus Master Software in PC and control two LEDs and Servo Motor by using RS-485 as transmission line. This tutorial is about using RS-485 Modbus communication with Arduino UNO as Slave.

Modbus RTU will be used in this tutorial. The only difference is that the bytes being transmitted over the wire are presented as binary with RTU and as readable ASCII with Modbus RTU. Modbus RTU and Modbus ASCII talks the same protocol. What is the difference between Modbus ASCII and Modbus RTU? Modbus has 255 function codes and there are mainly three popular versions of Modbus: And apart from this, the Modbus is also used in Healthcare, Transportation, Home Automation etc. Modbus are mostly used in PLCs (Programmable Logic Controllers). In this MAX485 Arduino project, we will use Arduino Uno as Slave for serial communication. In RS-485 Modbus network there is one Master and 127 Slaves each with unique address from 1 to 127. It is divided into two parts such as Modbus Master and Modbus Slave. It should be noted that Modbus is a software protocol and not a hardware protocol. RS-485 Modbus uses RS-485 for transmission lines. Modbus is a Serial Communication protocol which was discovered by Modicon in 1979 and it is used for transmitting data over serial lines between the industrial electronic devices.