FIRE ALARM FACILITY

PROBLEM TO BE SOLVED: To provide a fire alarm facility including an external testing device which is capable of easily identifying a test object device.SOLUTION: A fire alarm facility comprises: sensors D for detecting a change in environment based on a fire phenomenon and transmitting/receiving wireless signals; a fire receiver A for monitoring and controlling the sensors D; and one or multiple relaying devices that are interposed between the sensor D and the fire receiver A and configure multiple communication layers to relay the wireless signals. The fire alarm facility includes an external testing device E that determines the sensor D or the relaying device to be a control object device and controls it. The external testing device E transmits a signal for determining the control object device to the sensor D or the relaying device, and when the sensor D or the relaying device receives the signal for determining the control object device, the sensor D or the relaying device transmits a response signal including its own device ID to the external testing device E. When the external testing device E receives the response signal, the external testing device E determines the sensor D or the relaying device of the maximum signal level to be the control object device.