RTU and Substation automation

Remote Terminal Unit (RTU) lies between the substation and the network controlling center(NCC). Basically RTU interfaces the devices in the physical world to the SCADA. An RTU can be interfaced with the Central Station with different communication media (usually serial (RS232, RS485, RS422) or Ethernet). RTU can support standard protocols (Modbus, IEC 60870-5-101/103/104, DNP3, ICCP, etc.) to interface any third party software.