INTERCOM SYSTEM, INTERCOM MASTER UNIT, AND FIRE ALARM

摘要

PROBLEM TO BE SOLVED: To provide an intercom system in which a warning sound is output also from a fire alarm, intercom master unit and fire alarm used therefor. SOLUTION: An intercom system A comprises an intercom master unit 1 which calls an intercom slave unit 4, a fire alarm master unit 2 which detects occurrence of fire and issues an alarm, and a plurality of fire alarm slave units 3. The intercom master unit 1 includes a control I/F command transmitting/receiving circuit 15 which receives a fire detecting signal from the fire alarm master unit 2 or from any fire alarm slave unit 3 and transmits a warning sound signal to the fire alarm master unit 2 and the fire alarm slave units 3, and each of the fire alarm master unit 2 and the fire alarm slave units 3 includes a data transmitting/receiving circuit 20 which transmits a fire detecting signal to the intercom master unit 1 and receives the warning sound signal from the intercom master unit 1. When the warning sound signal is received from the intercom master unit 1, each of the fire alarm master unit 2 and the fire alarm slave units 3 then outputs the warning sound via a speaker 24, respectively. COPYRIGHT: (C)2008,JPO&INPIT