Abstract: An intrusion alarm system is described which includes multiple-input intruder sensing circuits, the outputs of which are fed via separate logic NAND circuits, to bistable latch circuits which then supply signals to an alarm latch circuit. One of the bistable latch circuits is coupled to the alarm latch via an entry delay timer, and all latches incorporate noise suppression circuitry. The intrusion system has a remote arming and resetting circuit which provides automatic testing of on-board status monitor lamps. This intrusion system is interconnected to an adjust fire/emergency sensing and control unit.