Modbus is an automation protocol originally specified for serial networks such as RS-485 (Modbus RTU). It has since been adapted for Ethernet networks (Modbus TCP). Overview

Modbus is an open, serial communications protocol based on the master/slave architecture. Since it is extremely easy to implement on all kinds of serial interfaces, it has gained wide acceptance. Due to its open standards Modbus TCP is common for the use of Ethernet in the fields of automation. Modbus TCP has a so called “Well known port (Port 502)”, which makes it routable via the Internet. RT-Labs Modbus stack M-Bus supports both the traditional serial RTU variant, as well as the Ethernet based TCP variant.

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