Supervised wireless security system
Number of patents in Portfolio can not be more than 2000
United States of America Patent
Stats
-
Apr 28, 1987
Issued Date -
N/A
app pub date -
Feb 16, 1984
filing date -
Sep 30, 1982
priority date (Note) -
Expired
status (Latency Note)
Importance
Abstract
Apparatus and method for communication by use of a single FM radio frequency, from a plurality of transmitters to a central receiver in a security alarm system or similar system. A transmitter's radio frequency signal is modulated in wide frequency swings to transmit digitally encoded address, subaddress, and sensor status information in a very brief format. The receiver automatically tracks the rapidly varying frequency of the transmitted signal. A transmission is provided periodically from each transmitter, but a very low duty cycle is used to avoid interference among the transmitters. Address and subaddress data identify each transmission and a maintenance warning is provided by the receiver-decoder unit to identify any transmitter which fails to report within a predetermined time. Each significant sensor change initiates a transmission from the related transmitter. Low duty cycle and low transmitter power requirements provide long transmitter battery life.
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