Can have a maximum of 32 devices connected to RS-485 protocol. The main advantage of RS-485 over RS-232 is the multiple slave with single Master while RS-232 supports only single slave. It transfers data up to 1200-meter maximum. It also provides maximum data transfer distance compared to RS-232 protocol. RS-485 supports higher data transfer rate of 30Mbps maximum. It provides a Half-Duplex communication when using two wires and Full-Duplex requires 4 fours wires. So what is this differential signal transfer method?ĭifferential signal method works by creating a differential voltage by using a positive and negative 5V. It uses a technique called differential signal to transfer binary data from one device to another. 
RS-485 is an asynchronous serial communication protocol which doesn’t not require clock. Also learn more about various Serial Communication protocols here. Let’s begin by exploring some background about the RS-485 and Modbus.
Serial Communication Between STM32F103C8 and Arduino UNO using RS-485. RS-485 Serial Communication between Raspberry Pi & Arduino UNO. RS485 can also be used with other controllers for serial communication: 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?
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