Hi, I'm sure you're gonna need this kind of info (instrument driver) : http://zone.ni.com/idnet97.nsf/9b2b33e1993d877786256436006ec498/B7C4A636069D1A3686256A720030005C?OpenDocument
You'll probably have to replace all the commands already used by the ones your instrument can understand and answer to. Which LV Version do you use ? Serial or GPIB communication ? Could you send the previous application (if it's not too big) so that we can help you a bit more on what you should do ? Hope this helps already ! Julien