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What does it mean by COM1 on the HMIGTU is isolated?

Issue:
What does it mean by COM1 on the HMIGTU is isolated?

Product Line:
HMIG3U, HMIG5U, isolation

Environment:


Cause:


Resolution:
The isolation of the HMIGTU COM1 is isolating the SG (signal ground) from the FG (field ground).  This prevent noise and ground loops in the communications. 
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