Data transmission method for a multi-protocol handheld field maintenance tool
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United States of America Patent
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Apr 11, 2006
Grant Date -
Apr 15, 2004
app pub date -
May 16, 2003
filing date -
Mar 12, 2002
priority date (Note) -
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status (Latency Note)
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Abstract
A method for preventing unsafe transmission on an incompatible network with a multi-protocol intrinsically safe handheld field maintenance tool as provided. The method preferably includes checking voltage levels on two sets of network connections when a network connection is detected or indicated on one set. If incompatible voltage levels are detected, the field technician is warned. If voltage levels are appropriate on a selected set of network terminals, the method continues by listening for network traffic of the selected network type. In this manner, a multi-protocol intrinsically safe handheld field maintenance tool is operable with multiple process control communication protocols while minimizing the risk of incompatible data/signal transmission upon process communication loops.
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