FIRE ALARM DEVICE

PURPOSE:To attain centralized monitoring based upon a poling system by connecting a central monitoring device, a transmission line and a fire sensor to an alarm device, concentrically monitoring a sensing variable by the monitoring device, and when an operation input is inputted from the monitoring device, turning on or off a sensing variable display lamp. CONSTITUTION:A central processing unit (CPU) 10 arranged in the central monitoring device 1 executes a processing program stored in a storage device 11. In said constitution, the CPU 10 outputs a signal to a transmission line 14 through an interface 13 and successively and circularly accesses respective fire detectors 2 to request return data. When a return data exists, the data are received by the line 14, a signal is outputted to an alarm display part 16 through an interface 13 and the generating place and state of a fire are display to inform the fire. After completing a series of operation, the succeeding address is waited to start the accessing operation of the sensors 2. At the time of receiving an access signal from the device 1, each sensor 2 analyzes the data of the access signal.