Coded security switch

Details Coded security switch Coded security switch

1980-05-02

1983-08-02

Crosland, Donnie L.

Communications: electrical

Condition responsive indicating system

With particular coupling link

340514, 340526, 340531, 340534, 34030915, G08B 108, H04Q 700

Patent

active

043969100

ABSTRACT:
For use in an alarm system, a security switch is provided, the transition state of which is detected by an associated circuit and a coded signal transmitted along a communication path indicative of the transition state, this coded signal being received and decoded to provide an output indication of the switch state.

REFERENCES:
patent: 3848231 (1974-11-01), Wootton
patent: 3906348 (1975-09-01), Willmott
patent: 4095211 (1978-06-01), Shaughnessy
patent: 4109239 (1978-08-01), Davis
patent: 4191948 (1980-03-01), Stockdale
patent: 4207559 (1980-06-01), Meyer
patent: 4257038 (1981-03-01), Rounds et al.

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