LabView MAX finds the GPIB instrument but Instrument I/O Assistant inside a vi does not

[lec]

Using MAX I can communicate with the HP3457 Meter through the USB to GPIB Convertor purchased from NI. (# GPIB-USB-B). Then when I go into a vi and call Instrument I/O Assistant it cannot find the instrument. I'm using Win2000 and LabView 8.0. This has already stumped 2 LabView experts. Any ideas?
Thank you.

[Dennis_Knutson]

Can you verify that NI-VISA is installed? MAX uses ibrd and ibwrt for GPIB communication but the Instrument I/O Assistant relies on VISA. MAX has a software section that lists everything installed.

[Robert M]

I have a couple of things for you to try.

First, place a "VISA Resource Name" I/O node on the front panel of a blank VI.  Does the alias for your instrument show up in the drop down menu?  If so, can you use a VISA read and VISA write to talk to the instrument?  This will help isolate whether the problem is with VISA in LabVIEW or with the IIOA.

You can also try following the instructions in KnowledgeBase 3JND42HY: "Instrument I/O Assistant Not Installed Properly" Error to reinstall the IIOA.

What version of NI-VISA do you have installed?  As the KB recommends, you can try upgrading to the latest version, 3.5.