Patent ID: 7504788

Claim:
A device with at least one controllable divider element which is driven by a drive assembly retained within a track, and by an electric motor which is controllable by a central control unit and a local control unit, each of which has a central or local processor and exchanges data through an electric line provided in the track, the line functioning as the power supply for the electric motor, wherein provided in the central control unit is a first direct voltage which is connectable through a central switch to the power supply line, the switch being actuatable by a central sending unit as a function of the data to be transmitted from the central control unit to the local control unit; and that provided in the local control unit is local receiving unit which is capable of detecting changes in the voltage applied to the power supply line, which changes are convertible by a local processor into appropriate data, the processor being connected to a first local switch by which the voltage applied to the power supply line is connectable to the electric motor.