Alarm systems
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United States of America Patent
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-
Mar 27, 1990
Grant Date -
N/A
app pub date -
Jun 17, 1988
filing date -
Dec 17, 1985
priority date (Note) -
Expired
status (Latency Note)
Importance
Abstract
A detector for an alarm system receives a disturbance signal and transmits an alarm signal to a remote station. A group of such detectors can be connected in circuit to operate a common alarm. The detector has means (6, 26, 33) for suppressing a first disturbance signal so that only a second and subsequent ones trigger the alarm. There are also means (8, 30) whereby a disturbance signal only of a given length can pass to trigger the alarm. With another facility (38, 43) the detector registers whether it is the first or a subsequent one in a group to be disturbed. The detector is largely embodied on a integrated circuit chip and all these facilities are selectable by making or omitting simple pin connections.
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