Fire alarm system.

摘要

An object is to provide a fire alarm system adaptable to a large-size fire alarm system and capable of causing a receiving portion thereof to quickly detect fire information from a terminal unit or the like if the terminal unit or the like has been operated. In a fire alarm system in which terminal units, such as fire detectors, are connected to the receiving portion, an address is given to the terminal unit and which detects a terminal unit the status of which has been changed, wherein system polling or the like for a specific terminal unit, such as a transmitter, among the terminal units is performed prior to performing system polling of other terminal units.