The PC9 is a power/bus combiner unit which is designed for the 2Easy 2-wire system to supply power for the external door station, internal monitor and other accessories on the bus. It can operate as a normal power/bus combiner or auxiliary PSU and can support up to 4 monitors and 4 entry panels on a single user system. Features Easy plug-in bus connection Standard full-range AC output Supports up to 4 monitors and door stations Built-in power isolation Multi-current protection