Circuitry for burglar alarm annunciator

Details Circuitry for burglar alarm annunciator Circuitry for burglar alarm annunciator

1980-04-10

1981-05-26

Caldwell, Sr., John W.

Communications: electrical

Condition responsive indicating system

With particular system function

340506, 340508, 340513, 340524, G08B 2900

Patent

active

042701210

ABSTRACT:
An annunciator system includes circuitry which, upon depressing of a momentary switch isolating the annunciator system from closed loop inputs of an electronic burglar alarm sensing unit, identifies the status of each access switch in a closed loop circuit containing the plurality of access switches. The annunciator system also indicates the integrity of electrical connections to the respective access switches and to an audible alarm unit.

REFERENCES:
patent: 3686667 (1972-08-01), Schulz
patent: 3689906 (1972-09-01), Levy
patent: 3924256 (1975-12-01), Cohen

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