The most commonly used Modbus communication protocols are :. Modbus communication protocol exist for serial port as well as Ethernet port. Modbus uses a common language for devices and equipment to communicate with one and another. Modbus is the communication protocol first published by Modicon in 1979, incorporated for the industrial automation systems and to use with its Modicon Programmable Logic Controllers (PLCs). Modbus protocol is one of the oldest and the most popular communication protocol used in the field of industrial automation. Today we’ll discuss about Modbus TCP/IP, also known as Modbus-TCP is simply the Modbus RTU protocol with a TCP interface that runs on Ethernet.
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