Communications: electrical – Digital comparator systems
Patent
1974-10-24
1977-05-10
Yusko, Donald J.
Communications: electrical
Digital comparator systems
340274R, 340409, 340420, 179 2A, G08B 1900, H04Q 900
Patent
active
040231399
ABSTRACT:
A security control and alarm system includes a central station communicating with each of plural remote stations, or facilities, protected by the system. The remote stations may be multi-zone office buildings, shopping centers, or any of various specialized applications. The central station provides point-to-point monitoring of each protection sensor device at each remote station. Protection sensors of any desired type are encompassed by the system, including detectors for unauthorized entry, fire, smoke, mechanical equipment failure and the like. The central also provides remote control of various security functions including selective arming and disarming of the remote station, resetting of the alarm condition following an alarm activation, operating doors to permit access to authorized personnel, operating elevators to restricted, selected floors of a building, any of various other types of desired control functions. The system also may provide general remote control of non-security building functions. Communication between the central and remote is provided by an FSK-type multiplex mode of communication over standard voice grade telephone lines. Each person authorized to gain access to a remote, protected facility is provided a password. At the entrance of the facility, there is provided a telephone with a direct line connection to the central. An individual wishing to gain access must call and give the correct password to an operator at the central in response to which the operator issues a control to the remote facility for unlocking the entrance door. Elevator control is performed on the same basis. Parity check and general system test, in addition to various system operation monitoring and tamper detection means assure reliable operation of the system.
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