Four wire multi-satellite intrusion alarm control system with tamper switch

摘要: An intrusion alarm system has a number of satellites each connected to master by an unshielded cable having only four conductors, namely two power drive signal conductor which supplies the satellite transmitter and control circuit, conductor. When is detected satellite, its circuit transmits high level on also enables, but does not operate, speaker in satellite. The rocker switch investigator turns off when he arrives at supervised premises. This that caused responds sounding speaker, enabling determination where occurred. may be placed walk test position, tested, then returned initial supervisory position applying reset restore circuits all their normal condition. A tamper operates if tampered with causes transmission signal, different from master.