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It's supposedly fixed in VISA 15.0 but I haven't had a chance to test it.
The user reported that the manufacturer-supplied application also does not work. Have you tried swapping out the USB to Serial converter?
Bill
(Mid-Level minion.) My support system ensures that I don't look totally incompetent. Proud to say that I've progressed beyond knowing just enough to be dangerous. I now know enough to know that I have no clue about anything at all. Humble author of the CLAD Nugget.
If you can't get the manufacturer's software to work, then that is proof this isn't even a LabVIEW problem. You need to go back to the mfgr and work with them until you can get their software to work. Maybe the problem isn't even the USB/serial adapter, but their device is broken.