Supervised wireless security system

Details Supervised wireless security system Supervised wireless security system

1984-02-16

1987-04-28

Crosland, Donnie L.

Communications: electrical

Condition responsive indicating system

With particular coupling link

340531, 340346, 455 56, G08B 108

Patent

active

046618040

ABSTRACT:
Apparatus and method for communication by use of a single FM radio frequency, from a plurality of transmitters to a central receiver in a security alarm system or similar system. A transmitter's radio frequency signal is modulated in wide frequency swings to transmit digitally encoded address, subaddress, and sensor status information in a very brief format. The receiver automatically tracks the rapidly varying frequency of the transmitted signal. A transmission is provided periodically from each transmitter, but a very low duty cycle is used to avoid interference among the transmitters. Address and subaddress data identify each transmission and a maintenance warning is provided by the receiver-decoder unit to identify any transmitter which fails to report within a predetermined time. Each significant sensor change initiates a transmission from the related transmitter. Low duty cycle and low transmitter power requirements provide long transmitter battery life.

REFERENCES:
patent: 4095211 (1978-06-01), Shaughnessy
patent: 4109239 (1978-08-01), Davis
patent: 4442426 (1984-04-01), Heuschmann et al.
patent: 4462022 (1984-07-01), Stolarczyk

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