Bus operating module for connecting external devices, such as key switches or fingerprint readers, for arming/disarming on the System 9000 bus. Occupies an address in the system. Supplies a power supply of 12V DC, max. 50mA for external devices. Switching signal optionally NO or NC. Can be installed in a flush-mounted box or in the 9000BD1 mounting box. Power supply via bus, quiescent current consumption: 5mA, I-calc =5mA, dimensions: 16 x 30 x 11mm.