Controlled Station
A Controlled Station is a station such as an outstation, a slave (such as Geo SCADA Expert), or a Remote Terminal Unit (RTU) that is monitored and/or controlled by a Controlling Station.
On a Geo SCADA Expert system that is running as an IEC 60870-5 slave, the Geo SCADA Expert server is a controlled station.
Through the Geo SCADA Expert documentation suite, a controlled station is referred to as an outstation.