if you 'google' with the search phrase 'QMS200 labview' you will get 5 hits. The 3rd one leads you to the Stanford Research Systems homepage where a link to a LabVIEW driver for a High Pressure Gas Analyzer named is presented. This link is: http://www.srsys.com/downloads/programs/labview/srsQcmLv70.zip
Maybe that intrument is compatible (identical??) to yours??