Signalling unit interrogating groups of signal sources - cyclically receives binary signals from address sender controlled by clock pulse

摘要

The signalling unit calls addresses of signal sources by a clock pulse controlled address sender through interrogation and signalling lines. Signal sources deliver, when the address coincides, a binary signal to the signalling line. Interrogation lines consist of a bus line common to several groups of signal sources. Each group of sources is connected by a singalling line to a single receiver which selects individual binary signals from the simultaneously received line signals. The system is so controlled by clock pulse that the binary signals from signal sources are cyclically received.