BKNE 230 – 24RB is used for controlling one Belimo 24V smoke control damper actuator (BE24..-ST, BLE24-ST). The unit is connected to the Ringbus master controller via the 4 wire Ringbus communication. The Belimo ST actuators are equipped with plug connectors that can be plugged directly into BKNE 230-24RB unit. The actuator is isolated from mains by a transformer. Each unit has a predefined address and therefore has not to be addressed during the system commissioning. BKNE 230-24RB unit is able to work without 230 V, but then it is only sending data about actuator position to Ringbus master controller and is not able to turn on/off the actuators. Using test pushbutton, user is able to test the damper.