Two-wire multi-zone alarm system

Details Two-wire multi-zone alarm system Two-wire multi-zone alarm system

1978-10-16

1982-11-16

Caldwell, Sr., John W.

Communications: electrical

Condition responsive indicating system

With particular system function

340505, 340506, 340511, 340537, G08B 2500, G08B 2600

Patent

active

043597211

ABSTRACT:
A multi-zone alarm system operative with a two-wire alarm loop and having a simple network at each alarm sensor for providing a coded signal indicative of sensor identity and relatively simple circuitry at a central location for interrogation of the remote sensors and determination of those sensors providing an alarm signal.

REFERENCES:
patent: 2556363 (1951-06-01), Lord et al.
patent: 3234534 (1966-02-01), Todman
patent: 3482243 (1969-12-01), Buchsbaum
patent: 3553674 (1971-01-01), Head
patent: 3644927 (1972-02-01), Green
patent: 3702473 (1972-11-01), Fink
patent: 3716834 (1973-02-01), Adams
patent: 4041455 (1977-08-01), Norberg

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