What is Modbus Protocol?

Modbus Protocol is a messaging structure developed by Modicon in 1979.

It is used to establish client-server communication between intelligent devices.

Modbus has become a standard communication protocol and is now a commonly available means of connecting industrial electronic device. It is popular in industrial environments because it is openly published and royalty-free.

There are mainly three variants of Modbus protocols:

Modbus RTU (Remote Terminal Unit) – used in serial communication, and is the most common implementation available for Modbus.

Modbus ASCII – used in serial communication and makes use of ASCII characters for protocol communication.

Modbus TCP/IP or Modbus TCP – a Modbus variant used for communications over TCP/IP networks, connecting over port 502.

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What is Modbus Protocol?

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