专利名称：Alarm apparatus发明人：Priest, Eric申请号：EP99304994.9申请日：19990625公开号：EP0967585B1公开日：20040303
摘要：An alarm apparatus using a single pair of signal wires (20) coupled to detectorunits (30) and alarm output units (40). Voltage on the signal wires (20) is reversed toindicate an alarm condition and periodically dipped to a third voltage level to decouplethe alarm output units (40) enabling the detector units (30) to be monitored in the alarmstate.
申请人：PROTEC FIRE DETECTION PLC
地址：GB
国籍：GB
代理机构：Robinson, Ian Michael
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