Hi,
Error 0xBFFF072 is not a valid VISA error. I assume you meant 0xBFFF0072, which means:
"VISA: (Hex 0xBFFF0072) The resource is valid, but VISA cannot currently access it."
Check this knowledge base article for more details:
Error When Opening a VISA Session on a COM Port in MAXHope this helps.
DiegoF
National Instruments.