| 摘要 |
Provided is a fire alarm system including: a transmitter/receiver unit (4) for supplying a pulse voltage to power/signal lines (SG); a current value setting unit (5) for setting, as a current limiting value, an upper limit of a current output to the power/signal lines (SG) from the transmitter/receiver unit (4) when the pulse voltage is output; and a current control unit (6) for controlling the transmitter/receiver unit (4) to output a current having a value equal to or smaller than the current limiting value set by the current value setting unit (5). Accordingly, it is possible to prevent a malfunction from occurring in communications irrespective of a scale of the fire alarm system. |
