Multiple sensor intrusion alarm system

Details Multiple sensor intrusion alarm system Multiple sensor intrusion alarm system

1977-07-27

1980-06-03

Caldwell, Sr., John W.

Communications: electrical

Condition responsive indicating system

With particular system function

340152T, 340183, 340518, 340521, 340527, 340534, 367 93, G08C 1512, G08B 1900, H03K 1320, H04Q 300

Patent

active

042064490

ABSTRACT:
A multiple sensor intrusion alarm system including a central controller which communicates with a plurality of sensors over a single, interconnecting cable. The controller periodically polls each of the sensors, and in response to this polling signal, each sensor returns a signal indicating its status. The absence of a return signal from a particular sensor indicates to the controller that the sensor is malfunctioning or has been tampered with. In a preferred embodiment, the interconnecting cable is a single, two-conductor cable. The controller may also be connected to an alarm panel or remote monitoring station to indicate the presence of an alarm condition.

REFERENCES:
patent: 3178515 (1965-04-01), Bramer et al.
patent: 3611361 (1971-10-01), Gallichotte et al.
patent: 3634824 (1972-01-01), Zinn et al.
patent: 3653041 (1972-03-01), McGrath et al.
patent: 3735396 (1973-05-01), Getchell
patent: 3927404 (1975-12-01), Cooper
patent: 3986182 (1976-10-01), Hackett
patent: 4067008 (1978-01-01), Sprowls
patent: 4077030 (1978-02-01), Helavz

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