RTU (Remote Terminal Unit) is an electronic device that includes the microprocessor control system, provides the communication between the physical field equipment and the SCADA system, transmits the signals and information from the field to the central control system and carries the commands from the center to the field.
RTU can communicate with smart devices through many different physical communication channels and supports many communication protocols. RTU models known in the market can communicate via RS232, RS485, RS422 or Ethernet using different protocols such as Modbus, Profibus, IEC 60870-5-101/103/104, DNP3, IEC 60870-6-ICCP, IEC 61850.
Devices of ABB, GE, Siemens, Sprecher, SEL, WAGO, MOXA, Fultek, Adventech and many more are available. The model to be used varies according to the project and its structure.