| 摘要 |
PROBLEM TO BE SOLVED: To provide a fire detector whose manufacturing cost can be reduced by making the power circuit compatible with all types of fire detectors to unify manufacture lines of the fire detectors. SOLUTION: A power circuit 11 is provided with two terminals L and C to which signal lines on which power supply from a fire receiver is performed are connected, fire signal terminals FIRE1 to FIRE3 to which fire signals from the fire detection circuits 10A to 10C are inputted, confirmation lamp terminals L1 to L4, a diode bridge DB for nonpolarizing the polarity of the terminals L and C, a constant voltage circuit 13 for converting the power supply from the signal line into a prescribed constant voltage and outputting the constant voltage, a constant voltage output terminal V for outputting constant voltage to the circuits 10A to 10C, a reception circuit 16 for receiving a monitoring/ control signal from the fire receiver, a return circuit 17 for returning a return signal to the fire receiver, terminals SIG and RET for connecting the circuit 10A to 10C to the return circuit 17 and the reception circuit 16, and first to third switching circuits 12, 14 and 15.
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