DEVICE FOR FIRE ALARM Russian patent published in 1995 - IPC

FIELD: fire alarm devices. SUBSTANCE: device has receiving board, two-wire line with connected address units which are by-passed by output contacts of fire indicators. In addition device has generator of reset pulses, clock, comparison unit and counter. output of reset pulse generator is connected to inhibition input of clock and zero-set input of counter, output of clock is connected to counting input of counter and one input of comparison unit, another output of clock is connected to another input of comparison unit and to a wire of two-wire line, outputs of counter are connected to information inputs of indication unit and output of comparison unit is connected to permit input of indication unit. Each address unit has reset pulse generator, counter, address decoder and unit for controlled loading, output of reset pulse generator is connected to zero-set input of counter which outputs are connected to controlled input of controlled loading through address decoder. EFFECT: increased functional reliability. 1 dwg