| 摘要 |
An alarm or security system (10) employs sensors (12) interspersed throughout a building (B). Groups of the sensors are connected to respective control panels (P1-Pn) which are interconnected with each other for communications therebetween. Each control panel operates audio annunciators (20) for sounding an audio alarm when a sensor goes into alarm, as well as visual indicators (22) for providing a visual indication of an alarm condition. A method of synchronizing the sounding of the audio alarm and providing the visual indication includes designating one control panel a master panel (M) and the other panels as slave panels (S). The master panel generates a command signal for activating the audio annunciators and visual indicators to produce an audible alarm and a flashing light each of which separately indicates an alarm situation within the building. This signal is transmitted from the master panel to each slave panel for all of the panels to simultaneously activate the audio annunciators and visual indicators controlled by the respective panels so audio and visual alarms occur at simultaneously throughout the building.
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