Communications: electrical – Condition responsive indicating system – With particular system function
Patent
1984-04-19
1985-11-05
Crosland, Donnie L.
Communications: electrical
Condition responsive indicating system
With particular system function
340518, 34082554, 343 68R, G08B 2600
Patent
active
045517100
ABSTRACT:
In an alarm system a central signal station periodically transmits interrogation signals, preferably in the form of infrared radiation packets to remotely located detectors which transmit a response signal back to the central signal station after differing time delays that are characteristic for the individual detectors and which permit the localization of the source of the response signal. In an alarm state, the detectors respond to every interrogation signal, in the normal operational state to only every m.sup.th interrogation signal, i.e. less often, and in a state of diminishing battery potential to only every small p.sup.th interrogation signal, i.e. even less often. The state of the individual detectors is determined from the frequency with which the response signals are transmitted back by the detectors, that is the ratio of the response signals to the interrogation signals.
REFERENCES:
patent: 3508260 (1970-04-01), Stein
patent: 3623003 (1971-11-01), Hewitt
patent: 4056815 (1977-11-01), Anderson
patent: 4232308 (1980-11-01), Lee et al.
patent: 4423410 (1983-12-01), Galvin et al.
patent: 4477809 (1984-10-01), Bose
World Intellectual Property Organization: (Inventor: Hackett, Kenneth), International Publication No. WO 82/00910-Publication Date 3-18-82.
Guttinger Hannes
Pfister Gustav
Troup Alan P.
Cerberus AG
Crosland Donnie L.
Kleeman Werner W.
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