SYSTEM AND METHOD FOR FAIL SAFE OPERATION OF LOW VOLTAGE OCCUPANCY SENSORS
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United States of America Patent
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Issued Date -
Feb 6, 2014
app pub date -
Aug 1, 2012
filing date -
Aug 1, 2012
priority date (Note) -
Abandoned
status (Latency Note)
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Abstract
A system and method are disclosed for providing fail-safe operation of an occupancy sensor so that a load associated with the sensor will be energized in the event that the sensor malfunctions. Short voltage pulses are applied to a signal line by an occupancy sensor. A load control device recognizes the pulses as an indication that the sensor is in a healthy condition. If the load control device does not recognize the voltage pulses, it assumes the sensor is faulty and energizes the load (light) associated with the monitored space. The voltage pulses are different from the normal signals sent by the sensor to the load control device that indicate an “occupied” condition of the space. Other embodiments are described and claimed.
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