Communications: electrical – Condition responsive indicating system – With particular system function
Patent
1981-11-12
1984-07-24
Trafton, David L.
Communications: electrical
Condition responsive indicating system
With particular system function
340518, 340539, 34082506, G08B 2900
Patent
active
044620225
ABSTRACT:
A wireless security system in which a sensor for detecting a security violation is provided with a radio frequency transmitter adapted to excite the receiver of a control unit at a different location, the transmitter of the sensor radiating a signal responsive to the occurrence of a security violation. The sensor also having means to periodically excite the transmitter after the lapse of a period of time to indicate that the sensor is in proper working order, that period varying randomly. The control unit is provided with a memory and stores responses to the random signals, and at intervals long with respect to the random periods, samples the memory. The control unit responds to the absense of a stored response from the transmissions of the sensor.
In a preferred construction, a plurality of sensors are employed with a single control unit, each of the sensors radiating a unique encoded signal. The control unit may thus determine by sampling which of the sensors has failed to radiate a signal received by the control unit during the sampling interval of the control unit.
REFERENCES:
patent: 3701019 (1972-10-01), Jackson
patent: 3792469 (1974-02-01), McLean et al.
patent: 3866217 (1975-02-01), Bennett
patent: 3902478 (1975-09-01), Konopasek et al.
patent: 3925763 (1975-12-01), Wadhwani et al.
patent: 4347501 (1982-08-01), Akerberg
A. R. F. Products, Inc.
Trafton David L.
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