Wireless alarm system

Details Wireless alarm system Wireless alarm system

1979-06-21

1980-11-04

Waring, Alvin H.

Communications: electrical

Condition responsive indicating system

With particular coupling link

340636, G08B 100

Patent

active

042323088

ABSTRACT:
A radio receiver equipped central control unit continuously monitors at least one battery-powered remote transmitter activated in response to predetermined alarm conditions, such as open doors and windows, fire, smoke, low transmitter battery voltage, and the like. In its activated condition, the transmitter is cycled to radiate a one-second duration radio frequency signal every 30 seconds, such cycling being established by transmitter timer circuitry series-inserted between the transmitter and its battery power source. The transmitted signal is received by the central control unit which, in response to the received signal, selects and activates one or more alarm indicators for a predetermined time period. Such selection and activation of particular alarm indicators and the duration of their activation are determined by switching and timing circuitry series-inserted between the central control unit's radio frequency receiver and the various alarm indicators.

REFERENCES:
patent: 4056815 (1977-11-01), Anderson
patent: 4141010 (1979-02-01), Umpleby et al.

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