![]() 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?
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