Two-wire multi-zone alarm system

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

1982-09-02

1985-01-01

Crosland, Donnie L.

Communications: electrical

Condition responsive indicating system

With particular system function

340505, 340506, 340511, 340537, 34082505, G08B 2500, G08B 2600

Patent

active

044918283

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: 3644927 (1972-02-01), Green
patent: 3702473 (1972-11-01), Fink
patent: 3716834 (1973-02-01), Adams
patent: 4077030 (1978-02-01), Helava
patent: 4118700 (1978-10-01), Lenihan

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