The communication between the Arduino UNO and the Modbus Master Software is accomplished by using the RS-485 module.
Arduino Modbus Master Examples Software Protocol AndIt should be noted that Modbus is a software protocol and not a hardware protocol.
It is divided into two parts such as Modbus Master and Modbus Slave. In RS-485 Modbus network there is one Master and 127 Slaves each with unique address from 1 to 127. And apart from this, the Modbus is also used in Healthcare, Transportation, Home Automation etc. Modbus has 255 function codes and there are mainly three popular versions of Modbus. ![]() Arduino Modbus Master Examples Install Simply ModbusHere we install Simply Modbus Master Software in PC and control two LEDs and Servo Motor by using RS-485 as transmission line. These LEDs and servo motor are connected with Slave Arduino and controlled by sending values using Master Modbus Software. Since this tutorial uses RS-485, it is recommended to first go through RS485 Serial Communication between Arduino Uno and Arduino Nano. RS485 can also be used with other controllers for serial communication. It uses a technique called differential signal to transfer binary data from one device to another. It provides a Half-Duplex communication when using two wires and Full-Duplex requires 4 fours wires. For using RS-485 module with microcontrollers, a module called 5V MAX485 TTL to RS485 which is based on Maxim MAX485 IC is needed as it allows serial communication over long distance of 1200 meters. It is bidirectional and half duplex and has data transfer rate of 2.5 Mbps. This module requires a voltage of 5V. ![]() The Baud rate range is 75 bps to 115200 bps, maximum up to 6 Mbps. In this tutorial a software called Simply Modbus Software is used. Arduino Modbus Master Examples Download The SimplyYou can download the Simply Modbus Master from the given link and learn more about it by referring Software Manual. When the master requests data, the first byte it sends is the Slave address. This way each slave knows after the first byte whether or not to ignore the message. This number tells the slave which table to access and whether to read from or write to the table. It is two bytes added to the end of every Modbus message for error detection. Also, Arduino UNO is attached with two LEDs and one Servo Motor.
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