| 摘要 |
A separation type detector includes at least one pair of transmission and reception units connected through a transmission line, detects environmental abnormality according to changes in pulse beams or ultrasonic waves transmitted from the transmission unit and received by the reception unit, and sends an abnormal signal to a central monitor through the transmission line. The transmission and reception units respectively include transmission circuits assigned with an identical address. The pair of transmission and reception units are synchronously operated in response to a command from a central monitor.
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