Fire alarm system

A fire alarm system having a fire receiver to which a plurality of terminal devices are connected and arranged so that said fire receiver polls each of said terminal devices to transmit and receive a data signal, said fire alarm system being characterized in that:

• each of said fire receiver and said plural terminal devices comprises:
• a self-address memory, said self-address memory storing a self-address added for the purpose of mutual identification;
• a receiver address memory, said receiver address memory storing the addresses of other terminal devices and said fire receiver, which are the receivers of said signal;
• a data length calculator, said data length calculator calculating the length of said data signal to be transmitted to form data length signal;
• a signal group transmitter, said signal group transmitter transmitting a signal group formed by adding said self-address stored in said self-address memory, said address of said receivers stored in said receiver address memory and said data length signal formed by said data length calculator to said data signal;
• and
• a decoder, said decoder comparing an address signal of said receiver included in a received signal and said self-address stored in said self-address memory, decoding the content of each signal in said received signal group if said receiver address signal and said self-address coincide with each other, and determining the length of said data signal in accordance with said data length signal included in said signal group;
• wherein said terminal devices are transmitters to which detectors and devices to be controlled are connected;
• wherein each of said transmitters of said terminal devices includes:
• an information-receiver address memory, said information-receiver address memory storing the addresses of other transmitters that must be linkage-controlled if fire has been detected in accordance with a signal supplied from said detector connected to said transmitter;
• an indicator, said indicator giving information to said fire receiver by said signal group transmitter if fire has been detected in accordance with said signal supplied from said detector connected to said transmitter and for giving information to said other transmitters stored in said information-receiver address memory;
• a linkage-control memory, said linkage-controlled memory storing information regarding devices that must be linkage-controlled among said devices connected to said transmitter if fire has been detected in accordance with said signal supplied from said transmitter or a detector connected to one of said transmitter and the other transmitters;
• and
• a controller, said controller controlling corresponding devices in accordance with the content of said linkage-control storage region if fire has been detected in accordance with said signal supplied from said detector connected to said transmitter or if information has been given from said indicator of the other transmitter.