Alarm system and alarm device
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United States of America Patent
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-
Sep 18, 2012
Grant Date -
Jun 10, 2010
app pub date -
Dec 2, 2009
filing date -
Dec 5, 2008
priority date (Note) -
Expired
status (Latency Note)
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Abstract
An alarm system and an alarm device that are capable of enhancing a fail-safe function. A fire alarm device (A) operating as a master unit transmits a switching request signal to fire alarm devices operating as slave units at a predetermined timing. The switching request signal contains at least an own address and an address of a fire alarm device (B) that is to operate as the master unit next (S20). Upon reception of the switching request signal, among the fire alarm devices operating as the slave units, the fire alarm device (B) that is to operate as the master unit next judges whether or not switching is possible based on switching availability judgment information for judging whether or not switching to the master unit is possible (S30), and, when it is judged that switching is possible, starts operating as the master unit (S31).
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