The essence of both Modbus RTU and Modbus TCP/IP protocols is the MODBUS protocol, which relies on MODBUS register addresses to exchange data; But the hardware interfaces used are different. Modbus RTU generally uses serial port RS232C or RS485/422, while Modbus TCP generally uses Ethernet port.
Modbus protocol and Modbus TCP/IP protocol are different in function, transmission and application.
1、 Different functions
1. Modbus RTU protocol: The Modbus RTU protocol enables communication between controllers, as well as between controllers and other devices via a network.
2. Modbus TCP/IP protocol: The Modbus TCP/IP protocol provides services between the transport layer and the network layer.
2、 Transmission is different
1. Modbus RTU protocol: The short transmission distance and slow speed of Modbus RTU protocol limit its application.
2. Modbus TCP/IP protocol: The Modbus TCP/IP protocol has a long transmission distance and fast transmission speed, making it widely applicable.
3、 Different applications
1. Modbus RTU protocol: The Modbus RTU protocol is mainly used in electrical automation and process control, and generally uses RS-232 or RS-485 communication interfaces.
2. Modbus TCP/IP protocol: The Modbus TCP/IP protocol is mainly applied in the internet or intranet.
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