Household alarm system

Details Household alarm system Household alarm system

1989-04-06

1991-02-26

Crosland, Donnie L.

Communications: electrical

Condition responsive indicating system

With particular system function

340507, 340531, 340532, 340533, 340538, 340539, G08B 2900

Patent

active

049965174

ABSTRACT:
An alarm system providing external alarm signals for a structure. The alarm system includes transmitters for generating coded radio trigger signals. An alarm controller located in the interior of the structure is responsive to the coded radio trigger signals for generating alarm actuation signals. The alarm actuation signals are transmitted to alarm signal generators located on the exterior of the structure. Transmission lines for the alarm actuation signals are connected between the alarm controller and the alarm signals generators. Integrity determination of the transmission lines is provided by detection of a break in a current loop provided by a ground line and a ground sense line connected between the controller and the alarm signal generators along side the transmission lines.

REFERENCES:
patent: 3624635 (1971-11-01), Less
patent: 3833895 (1974-09-01), Fecteau
patent: 3863236 (1975-01-01), Clardy
patent: 3925763 (1975-12-01), Wadhwani et al.
patent: 4241332 (1980-12-01), Farque
patent: 4288784 (1981-09-01), Fusco
patent: 4730184 (1988-03-01), Bach

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