to support programming a TCS:BUS system, display :BUS protocols using numeric codes, evaluate and check :BUS protocols, change parameters for outdoor stations and indoor stations, carry out basic functions on the TCS:BUS, activate and deactivate call suppression, display the current :BUS voltage, program and delete bell buttons, test voice connections, - from the service device to the outdoor station, - from the service device to the indoor station, check the :BUS installation in service mode, activate and deactivate a programming lock, supports error analysis, color: gray, 3-wire technology required, input current (3-wire) = I(a) = 0.4 mA, I(P) = 10 mA at rest, max. input current: I(Pmax) = 13 mA, permissible ambient temperature: 0 degrees C to 40 degrees C, dimensions: H 20 mm x W 50 mm x D 50 mm