There are no command structures, whatever is sent to the Virtual COM Port is automatically converted to RS485 and vice versa. This is an USB to RS485 Converter Adapter module which supports WIN7, XP, Vista, Linux, Mac OS and provides an easy to use RS485 interface by means of using COM port in the computer. It is bidirectional and half duplex and has data transfer rate of 2.5 Mbps.
#Arduino modbus rtu serial
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 transfers data up to 1200-meter maximum.
#Arduino modbus rtu install
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?