Communications: electrical – Condition responsive indicating system – Specific condition
Patent
1995-09-15
1998-05-12
Hofsass, Jeffery
Communications: electrical
Condition responsive indicating system
Specific condition
340628, 250574, 356438, G08B 1710
Patent
active
057512167
ABSTRACT:
A projected beam-type smoke detector and receiving unit includes in its light receiver data output unit 118 for outputting serially status information and status signal output units 85, 86 for sending the status information to the receiving unit, and in its receiving unit 30 data examining unit 113 for examining sequentially the status information. The light receiver 31 also includes a pulse generator unit 82 for generating pulses having different pulselengths according to the type of alarm information, and photoelectric converter units 83, 84 for sending to the receiving unit 120 the pulses of different pulselengths generated by the pulse generator unit 82. The receiving unit 120 includes a pulselength determining unit 108 for determining the type of alarm information from the pulselength of the pulse sent by the projected beam-type smoke detector and display units 110, 111 for displaying the alarm information type determined by the pulselength determining unit 108. As a result, the alarm and status information is conducted by single lines. Simple and low-cost design is thus implemented into the projected beam-type smoke detector and receiving unit.
REFERENCES:
patent: 4015135 (1977-03-01), Tipton, Jr.
patent: 4126396 (1978-11-01), Hartmann et al.
patent: 4827247 (1989-05-01), Giffone
patent: 5477218 (1995-12-01), Manmoto et al.
Hochiki Kabushiki Kaisha
Hofsass Jeffery
Wu Daniel J.
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