Modbus-TCP means that the Modbus protocol is used on top of Ethernet-TCP/IP. ![]() It provides client/server communication between devices connected on different types of buses or networks. Modbus is an application-layer messaging protocol, positioned at level 7 of the OSI model. Modbus is an open Master/Slave application protocol, that can be used on several different physical Layers. Modbus was originally developed by Modicon and today, it is managed by the Modbus-IDA User Organization.
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