| 摘要 |
<p><P>PROBLEM TO BE SOLVED: To obtain an alarm system capable of determining by a master whether or not a slave interconnected with the master is able to receive interconnected signals transferred from the master, lowering power consumption, and beginning signal transfer according to the timing being set. <P>SOLUTION: A control circuit of a slave transmits interconnected signals giving noticing of an abnormal situation to all other fire alarms from a transmit-receive circuit according to a predetermined transmission pattern that includes a transmission time period of repeated signal transmission. A control circuit of a master receives interconnected signals transmitted from the slave by an intermittent receiving operation and sounds its own alarm; thereafter receives response signals only during a predetermined time period, the response signals being transmitted from other slaves other than the above-mentioned slave at the timings according to each address and indicating interconnected signal receptions; and transfers the interconnected signals to all slaves other than the above-mentioned slave, from which the master have not received the response signals. <P>COPYRIGHT: (C)2013,JPO&INPIT</p> |
