Security system with monitoring and warning circuits

Details Security system with monitoring and warning circuits Security system with monitoring and warning circuits

1985-04-22

1987-05-12

Crosland, Donnie L.

Communications: electrical

Condition responsive indicating system

With particular system function

340505, 340508, 340517, 340518, 340692, 340384E, G08B 2900

Patent

active

046653830

ABSTRACT:
A central protection system suitable for the protection of a building from fire and other hazards includes a set of environmental sensors and circuitry for interrogating the sensors. The system also includes communication and control lines, as well as monitoring circuitry having individual channels coupled to respective ones of the communication and control lines. An inaudible pilot tone of subsonic frequency may be coupled to a communication line, and the corresponding channel of the monitoring circuit includes a detector of the pilot tone. A circuit for the generation of evacuation signals and fire brigade signals is composed of two sections coupled in tandem, and includes sequencing circuitry for the recycling of tones produced by the respective sections.

REFERENCES:
patent: 3906491 (1975-09-01), Gosswiller et al.
patent: 3921168 (1975-11-01), Dunbar
patent: 4064507 (1977-12-01), Schmitz
patent: 4067008 (1978-01-01), Sprowls
patent: 4100543 (1978-07-01), Stockdale et al.
patent: 4141006 (1979-02-01), Braxton
patent: 4206450 (1980-06-01), Harden et al.
patent: 4229734 (1980-10-01), Schultz
patent: 4342985 (1982-08-01), Desjardins
patent: 4361832 (1982-11-01), Cole

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