Fire alarm system

Abstract

A fire alarm system exhibiting satisfactory reliability and capable of easily and assuredly setting address and various discrimination values to terminal units. The fire alarm system has a setting unit including a first command unit, a first discrimination unit for discriminating whether or not a transmitted set value transmitted by the first command unit and a set value received from a detector coincide with each other, a second command unit for transmitting the set value to the detector when the received set value and the transmitted set value coincide with each other, and a second discrimination unit for discriminating whether or not the received set value and the set value transmitted from the first or the second command unit coincide with each other. The fire alarm system further includes the fire detector having a first response unit for transmitting, to the setting unit, a first response signal and the received set value when the output from the first command unit has been received, a second response unit for transmitting a second response signal and the received set value when the set value received when the output from the second command unit has been received and the set value received by the first response unit coincide with each other, and a writing unit for storing a result of discrimination in an EEPROM when the two set values received by the second response unit coincide with each other.