Importance

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Abstract

A fully integrated alarm, communication, and building management system has a central control station and a plurality of remotely located sensing and controlling devices. Each remote device has an individual digital address, which is a parallel address present on a plurality of parallel lines. The parallel address is converted to a serial address and sent to the various remote locations where it is then reconverted to a parallel address and decoded to determine the specific device being interrogated. A multiple amplifier system is provided at the central control unit and provides communication capability involving remotely located loudspeakers and microphones. The amplifiers are provided in a dual channel arrangement so as to provide a fail-safe arrangement and a failure detector is located in each channel such that if a selected amplifier channel fails, the back-up or redundant channel is immediately switched into use. A number of controlling devices or actuating devices may be employed which operate in conjunction with the sensing devices and a programmable read only memory, or a programmable multiplexer, located at the central control unit. Each remotely located controlling or actuating device also has associated with it an individual parallel digital address and upon the occurrence of a signal from a sensing unit indicating a condition other than a normal condition and a specific address programmed into the programmable read only memory or the multiplexer a command signal will be issued to the remotely located actuating or controlling device causing such device to operate in a predetermined manner.

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First Claim