Savin P7026 Manual do Utilizador descarregar pdf (Página 71)

PET-70216/ET-7026 User Manual, version 1.0.1 beta1, Page: 71

4.1. What is Modbus TCP/IP?

Modbus is a communication protocol developed by Modicon in 1979.

Different versions of Modbus used today include Modbus RTU (based on serial

communication like RS485 and RS232), Modbus ASCII and Modbus TCP, which is

the Modbus RTU protocol embedded into TCP packets.

Modbus TCP is an internet protocol. The protocol embeds a Modbus frame into a

TCP frame so that a connection oriented approach is obtained thereby making it

reliable. The master query‟s the slave and the slave responds with the reply. The

protocol is open and hence highly scalable.

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Savin P7026 Manual do Utilizador Página 71