AUTOMATIC FIRE ALARM SYSTEM PROVIDED WITH MUTUAL REGION ACOUSTIC RINGING FUNCTION

摘要

PROBLEM TO BE SOLVED: To provide two fire receivers for mutually ringing region acoustics with a successive ringing function and to make the method of display or operation to respective two fire receivers easy to comprehend. SOLUTION: Two fire receivers 1 (#A and #B) mutually connect mutual ringing terminals SB and SBc and representative fire relay terminals Fa and Fc and the respective two fire receivers 1 (#A and #B) are provided with a mutual ringing signal receiving circuit 10 and a representative fire relay contact (r). When a fire sensor S is operated and a fire signal is received, a region acoustic device B is ringed and the representative fire relay contact (r) is closed. When the mutual ringing signal receiving circuit 10 detects a signal input, on the other hand, the region acoustic device B is ringed.