Wired data communications network
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United States of America Patent
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Aug 29, 2017
Grant Date -
Aug 6, 2015
app pub date -
Mar 13, 2013
filing date -
Sep 19, 2012
priority date (Note) -
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status (Latency Note)
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Abstract
A wired data communications network for use in a building for the detection of fire or intrusion, the network including a control unit connected by cable to a series of uniquely addressable transducers for the transmission and reception of data in a polling signal. Each transducer has a memory for control data and for its own unique address and responds to a predetermined start voltage pulse in the polling signal to clear its memory and then responds to control data and address data in the polling signal to store the control data when the address matches its own address and transmit data to the control unit representative of its own status. At least one of the transducers determines whether the control data is extended data and, if so, stores the extended control data and the further control data, and performs the said transmission of data to the control unit and any other process dictated by the extended control data.
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