Remote terminal unit

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A remote terminal unit (RTU) is a microprocessor-controlled electronic device that interfaces objects in the physical world to a distributed control system or SCADA (supervisory control and data acquisition) system by transmitting telemetry data to a master system, and by using messages from the master supervisory system to control connected objects.^[1] Other terms that may be used for RTU are remote telemetry unit and remote telecontrol unit.