Security equipment including trigger circuit

Details Security equipment including trigger circuit Security equipment including trigger circuit

1980-02-11

1982-01-12

Waring, Alvin H.

Communications: electrical

Condition responsive indicating system

With particular coupling link

340524, 340537, 340545, 307100, G08B 2500

Patent

active

043108350

ABSTRACT:
Security equipment comprises a plurality of normally-open or normally-closed switch contacts connected in a loop circuit to a central control circuit. Each pair of switch contacts has a respective resistor connected in parallel therewith and the control circuit is operable to detect changes in resistance due, for example, to an intruder operating one of the switches.

REFERENCES:
patent: 3588865 (1971-06-01), Hansen
patent: 3626403 (1971-12-01), Ive
patent: 4118700 (1978-10-01), Lenihan

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