Fire alarm system

Details Fire alarm system Fire alarm system

1983-10-27

1985-06-25

Crosland, Donnie L.

Communications: electrical

Condition responsive indicating system

With particular system function

340505, 340507, 340511, G08B 2600

Patent

active

045257000

ABSTRACT:
A fire alarm system has a main unit and a plurality of sensor terminals in accordance with a polling system. The plurality of sensor terminals are divided into a plurality of groups. When a given sensor terminal of a given group is accessed and transmits digital data as response data indicating a smoke concentration or a temperature to the main unit, and the response data exceeds a first reference value thereby indicating that a fire has broken out, the main unit accesses other sensor terminals of the given group. If some of the response data therefrom exceed a second reference value which is equal to or smaller than the first reference value, the main unit counts the number of such sensor terminals. When the number exceeds a predetermined number, the main unit displays information indicating the existence of a fire.

REFERENCES:
patent: 4100542 (1978-07-01), Gallant et al.
patent: 4222041 (1980-09-01), Von Tomkewitsch et al.

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