Just to expand a bit on what Dennis said, if you're looking to control a specific instrument via GPIB, you might be able to find a driver for that instrument at
ni.com/idnet. If you do, download it, copy it to your instr.lib folder, and look for the VIs in the Instrument I/O palette. If you can't find a driver there, you could also look at the VISA examples in Example Finder and refer to your instrument documentation for GPIB commands to use. Good luck!
Chad B. »
National Instruments » ni.com