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CTB16PC Port 1 blinking intermittently


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On one of my pc16's, which is connected to my PC's USBRS485 with about 125' of cat5e, every minute or two the decoration attached to port 1 will flash on for a second then turn off.  The PC is a stripped down show PC running 4.3.14 with the Control Panel running 24/7.

It appears that if I disconnect the cable from the USB adapter, the problem goes away.  I have a spare 485B, do I need to use that to get the distance?  Also, would a terminator help the issue?

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