Alarm system
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United States of America Patent
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Mar 20, 2007
Issued Date -
N/A
app pub date -
Dec 21, 2005
filing date -
Sep 19, 2002
priority date (Note) -
Expired
status (Latency Note)
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Abstract
A transmitter comprises a signaling history information transmission unit. After the transmitter generates a detection signal, the signaling history information transmission unit sends corresponding signaling history information to a regular signal transmission unit. From this regular signal transmission unit, the signaling history information and a regular signal are transmitted to a receiver. The signaling history information contains a count value which is updated at every transmission of the information. Even if the transmitter generates a detection signal during a communication failure, the receiver can identify a time when the transmitter generated the detection signal, based on a received count value.
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