Selective clearing of latched circuits
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United States of America Patent
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-
Aug 28, 1990
Grant Date -
N/A
app pub date -
Apr 29, 1988
filing date -
Apr 29, 1988
priority date (Note) -
Expired
status (Latency Note)
Importance
Abstract
An alarm system includes a controller and a plurality of transponders having different addresses. Certain of the transponders include switch means for monitoring conditions, and latch circuits to retain memory of the switch conditions. The controller includes means for positive recognition of a latched alarm or trouble condition in any transponder, before the clear-alarm signal or clear-trouble signal is sent from the controller to restore the alarm circuits to their original states. This insures that an alarm or trouble condition at a transponder is not 'missed' by inadvertent clearing before a positive recognition is registered in the controller.
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