SLAVE MACHINE AND MASTER MACHINE OF AUTOMATIC FIRE ALARM SYSTEM, AND AUTOMATIC FIRE ALARM SYSTEM USING THEM

摘要

PROBLEM TO BE SOLVED: To prevent a state where voltage between a pair of electric wires deteriorates from continuing beyond a time slot, even when a plurality of slave machines of an automatic fire alarm system transmit a signal for giving a notification on occurrence of fire.SOLUTION: A slave machine 1 of an automatic fire alarm system A1 includes a transmission unit 101 and a control unit 4. The transmission unit 101 is electrically connected to a pair of electric wires 51, 52 to which voltage is applied, and decreases voltage between the pair of electric wires 51, 52 to transmit fire alarm for notifying an occurrence of fire. The control unit 4 controls the transmission unit 101. The control unit 4 starts transmission of the fire alarm and ends transmission of the fire alarm, at the same time slot determined on the basis of identification information.SELECTED DRAWING: Figure 2