| 摘要 |
<p>A system for testing a remotely located sensing unit (10) includes a photosensor (20a) located within the sensing unit (10). A control beam of incident electromagnetic energy (8a) can be provided from a remotely located portable source such as a flashlight (8). Directing the beam of radiant energy from the flashlight against the sensor (20a) in the unit causes the unit to initiate a test sequence. The unit can be equipped with a photo-detector (88) to terminate an alarm generated in response to a sensed condition. The unit (96) can include a sonic detector. Control circuitry (98c) in the unit (96) can decode a sensed encoded incident beam (100) to minimize false tests or to provide multiple remotely initiated functions.</p> |
