Intrusion alarm sensing unit
Number of patents in Portfolio can not be more than 2000
United States of America Patent
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Jun 1, 1993
Grant Date -
N/A
app pub date -
Nov 16, 1990
filing date -
Nov 16, 1990
priority date (Note) -
Expired
status (Latency Note)
Importance
Abstract
The present invention is directed to an intrusion detection system having two different types of motion sensors and processing of the signals produced by the motion sensors in a manner to provide a reliable indication of motion within the space being sensed. The intrusion detection system includes a microprocessor and produces an alarm signal if each sensor is activated within a predetermined time period of each other. The unit is also capable of producing what is referred to as a 'trouble' signal, based upon a certain number of unconfirmed event signals, i.e. a signal from only one sensor being received, within a predetermined time, indicating that one of the sensors is not operating properly. Once a certain number of unconfirmed event signals are received, the unit operates in one of at least two different default modes whereby a trouble signal or trouble signal and alarm signal are produced by means of a different logic processing step. The invention is also directed to an intrusion detection system having dual sensors where the user can automatically reset the unit should the system have gone into default mode operation. This is particularly useful in that it reduces service on the units and also provides an easy, convenient manner for the user to restore the device to normal operation when required.
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