Remote Terminal Unit (RTU)

A remote terminal unit is a microprocessor-based device that monitors field instruments and equipment at remote sites and communicates their status back to a central SCADA system. RTUs are built for harsh, distributed environments such as pipelines, water networks, and electrical substations.

RTUs collect analog and digital inputs from sensors, perform local control, and transmit data over long distances using radio, cellular, or serial links, often with low power consumption for solar-powered remote sites. They emphasise rugged construction, wide temperature tolerance, and resilient communications. RTUs matter because many industrial assets are spread across vast geographies where wiring everything back to a control room is impossible, so reliable remote telemetry and control depend on these field devices.