| 摘要 |
PCT No. PCT/JP93/00124 Sec. 371 Date Oct. 4, 1993 Sec. 102(e) Date Oct. 4, 1993 PCT Filed Feb. 2, 1993 PCT Pub. No. WO92/14196 PCT Pub. Date Aug. 20, 1992.A fire alarm system has address numbers that are given to terminal devices, such as transmitters, analog fire detectors and addressable fire detectors, and are given to the fire receiver similarly to the foregoing terminal devices. A signal to be transmitted from the fire receiver is given the address of the fire receiver as the sender address as well as the addresses of the terminal devices which are the information receivers, and a signal to be transmitted from the terminal device is given the address of the receiver of the signal as well as the self-address. As a result, information can be directly transmitted to the terminal devices, and therefore, the load of the fire receiver can be reduced. When the fire receiver and the terminal device transmit the data signal, a data length signal denoting the length of the data to be transmitted is calculated, and the data length signal is transmitted together with the data signal. As a result, the portion for receiving the signal group is enabled to discriminate and receive the data signal, the length of which has been instructed by the data length signal.
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