It is bidirectional and half duplex and has data transfer rate of 2.5 Mbps. 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. RS-485 Module can be connected to any microcontroller having serial port. It provides a Half-Duplex communication when using two wires and Full-Duplex requires 4 fours wires. 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. So, let’s begin by a short introduction about the RS-485 and Modbus. Here MODBUS Slave Software installed computer will be used as MODBUS Master. In continuation with that article today Arduino will be used MODBUS Master and communicate with MODBUS slave. In the previous tutorial we learned about Modbus RS-485 Serial Communication with Arduino as Slave.
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