Signalling system with ambient condition reference monitoring

摘要: A self-contained theft and vandalism deterrent system for equipment security includes sensors (12) detecting conditions to which an alarm (24, 26, 28, 50) is responsive. The analog signals from the are serially delivered by a multiplexer circuit (16) when they then directed network (20) conversion digital signals. micro processor (22) where evaluated determine if condition exists. sensing means include sound vibration detectors monitoring ambient envelope. built in reprogramming comparator circuits varying level at given will trigger response.