Abstract: A fire alarming system includes a plurality of terminal devices including fire sensors, transmitters, manual boxes, and/or other devices to be controlled; and a receiving device to which the plurality of terminal devices are connected. A great number of terminal devices with a manual box are connected to the receiving device. When a plurality of manual boxes are activated at the same time, the terminal devices corresponding to the activated manual boxes can be called at the same time without encountering a collision among returning-back signals transmitted from these terminal devices. That is, when a plurality of manual boxes are activated at the same time, the signal of only one of the plurality of activated manual boxes can arrive at the receiving device.

Abstract: A fire alarming system includes a plurality of terminal devices including fire sensors, transmitters, manual boxs, and/or other devices to be controlled; and a receiving device to which the plurality of terminal devices are connected. A great number of terminal devices with a manual box are connected to the receiving device. When a plurality of manual boxs are activated at the same time, the terminal devices corresponding to the activated manual boxs can be called at the same time without encountering a collision among returning-back signals transmitted from these terminal devices. That is, when a plurality of manual boxs are activated at the same time, the signal of only one of the plurality of activated manual boxs can arrive at the receiving device.