Hello:
There is an example that communicates with a GPIB instrument using LabVIEW. In LabVIEW go to the Help menu >> Examples.. >> I/O >> GPIB you will see a couple, try tweaking those examples. The developer zone has lots of examples too, ni.com >> NI Developer Zone > Development Library > Instrument Connectivity > GPIB. The GPIB support page is also a good resource. To find it go to ni.com >> Support >> GPIB (option 2) >> "Communicating with GPIB Instruments" (option 2) are good links.
Make sure you are using the correct driver version for your GPIB board. http://www.ni.com/support/gpib/versions.htm shows you the one you need. Hope this helps. If you have any questions, please let us know.
-NI Support.