The Modbus protocol is the oldest and most widespread serial fieldbus. International in the RTU version.īorn back in 1979 within Modicon (now a brand of Schneider Electric) the Modbus protocol is still one of the most popular serial communication systems between PLC, DCS, controllers, sensors, actuators, field devices and interfaces. Because it is open source and royalty-free, it is widely used by manufacturers to connect software and electronic devices. Modbus is a de facto standard for industrial communication protocols.
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