Fire alarm system
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United States of America Patent
Stats
-
Nov 26, 1985
Grant Date -
N/A
app pub date -
May 17, 1984
filing date -
May 19, 1983
priority date (Note) -
Expired
status (Latency Note)
Importance
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.
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