Intrinsically safe multi-drop communications link
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United States of America Patent
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-
Sep 1, 1987
Grant Date -
N/A
app pub date -
Oct 2, 1985
filing date -
Oct 2, 1985
priority date (Note) -
Expired
status (Latency Note)
Importance
Abstract
A multi-drop communication link, consisting of a master and a plurality of slaves is intrinsically safe for use in a hazardous environment. Slaves are in parallel and communicate with the master through transmit and receive shunt-diode safety barriers. An opto-coupler interface is provided between each slave and the transmit and receive circuits communicating with the master. The opto-couplers comprise infrared emitter-detector pairs which can be spaced apart by an intrinsically safe distance.
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