Patent ID: 6738238
Filing Date: 2004-05-18
Classification: G05B,G08B

Abstract:
A fire safety system comprising:a control panel comprised of one or more controllers for controlling a plurality of devices, a pair of lines operably connected to said control panel and said devices for communicating signals between said control panel and said devices; at least one rectifier circuit operatively connected between said lines and at least one device, wherein said at least one rectifier circuit is comprised of at least a first transistor and a second transistor, each said transistor providing the circuit with a low-impedance ground path when said transistor is turned on, said transistors further providing the circuit with a polarity insensitive output; and a sensing circuit operatively connected between each said at least one rectifier circuit and each said at least one device, each said at least one device provided with a device controller, wherein at least one of said sensing circuit and said device controller extract one or more signals from said at least one rectifier circuit to be received by said at least one device.