Alarm device
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United States of America Patent
Stats
-
Nov 6, 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
Provided is an alarm device capable of performing transmission and reception reliably while suppressing an amount of current consumption. An alarm device (100) includes: a fire detection circuit (7); a control circuit (1); and a transmitting/receiving circuit (5). The transmitting/receiving circuit (5) transmits the status signal to the another alarm device (100) with a transmission pattern formed by combining transmission periods and transmission suspension periods a predetermined number of times, and receives the status signal transmitted by the another alarm device (100) in an intermittent reception cycle. A time length of each of the transmission periods and the transmission suspension periods is set so that the another alarm device (100) that has failed to receive the status signal transmitted in a first intermittent reception cycle can receive the status signal in a second intermittent reception cycle and subsequent intermittent reception cycles.
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