Jose,
There is a KnowledgeBase entry that talks about using NI-VISA 2.5 to communicate with an HPIB board through LabVIEW 6. Unfortunately, this is only possible in Windows. For HP-UX I'm afraid your only option is to use a Call Library Node in your LabVIEW program to make direct calls to the HPIB driver. If you can obtain documentation on the HPIB shared libraries that come with the board, it is viable for you to communicate directly through a Call Library Node.
I hope this suggestion points you in the right direction. Have a good day.
Sincerely,
Darren Nattinger
Applications Engineer
National Instruments
