Communications: electrical – Condition responsive indicating system – With particular coupling link
Patent
1984-05-17
1985-11-26
Crosland, Donnie L.
Communications: electrical
Condition responsive indicating system
With particular coupling link
340505, 340514, 340518, 340310R, 340584, 340628, G08B 108
Patent
active
045556954
ABSTRACT:
A fire alarm system having a plurality of fire detectors connected in parallel with each other to a pair of power/signal lines leading to a central signal station and adapted to respond to the signal station with a detection signal in the mode of current and controlling the signalling between the fire detectors and the signal station. The detection of a fire is accomplished by computing a difference between a steady-state current flowing through the signal lines and a detection current which are detected in an analog amounts. Each of the fire detectors is called by a simple calling clock pulse whose transmitting timing is controlled by a microcomputer of the central signal station to transmit a detection data. The generation timing of the calling clock pulses is freely selectable to effect a desired control of the fire detectors.
REFERENCES:
patent: 4161727 (1979-07-01), Thilo et al.
patent: 4162489 (1979-07-01), Thilo et al.
patent: 4206449 (1980-06-01), Galvin et al.
patent: 4287515 (1981-09-01), Raber et al.
patent: 4404548 (1983-09-01), Muller et al.
patent: 4491828 (1985-01-01), Galvin et al.
patent: 4491830 (1985-01-01), Miyabe
Machida Haruchika
Yuchi Sadataka
Crosland Donnie L.
Hochiki Kabushiki Kaisha
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