| 摘要 |
<p>An audio/visual alarm system which includes multiple microprocessor-controlled alarm units 5, 9, 11, connected in a common loop 40 to a fire alarm control panel 25 and an interface control circuit 44. The interface control circuit 44 causes brief interruptions in power to the alarm units which synchronize operation of the alarm units and which can also be used as alarm control signals. The interface control circuit 44 allows for control of both audio and visual alarms using only the single common loop connection 40 between alarm units.</p> |
