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Title: BASICS OF USING MODBUS IN MONITORING AND CONTROL
Author: Tushar Shah and Elias Davis
Source: 2019 Appalachian Gas Measurement Short Course
Year Published: 2019
Abstract: The MODBUS is a common industrial communication protocol. It is widely available either as a standard or an option in an industrial control and monitoring equipment e.g. Remote Terminal units (RTUs), Programable Logic Controllers (PLCs), Flow Computers, Volume Correctors, Pressure Recorders, Ultrasonic Meters, Coriolis Meters, Chromatographs, Valve controllers, Odorizers, Supervisory control and data acquisition (SCADA) systems etc. Originally, MODBUS serial communication protocol was published in 1979 for use with its PLCs by Modicon (now Schneider Electric). It has become a de facto standard communication protocol for industrial electronic devices. Since 2004, the development and update of MODBUS protocol is managed by the Modbus organization. Over the years the protocol has evolved, including the latest variation allowing communication over an ethernet network. Modbus is a simple protocol however, it can get confusing as there are different avors of MODBUS available i.e. MODBUS ASCII, MODBUS RTU, MODBUS TCP, MODBUS Plus, Extended MODBUS etc.

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