Without a header file you are in a world of hurt. Try to contact the manufacturer for that information. Perhaps they can give you an uncompiled example program.
Once you get the information, look in the Using External Code in LabVIEW manual found on the LabVIEW bookshelf (open LabVIEW >> help >> search LabVIEW bookshelf). If you have LabVIEW 7.0 there is a shipping example (open LabVIEW >> help >> find example) that will be very useful called Call dll . It is found in the communicating with external applications >> using external code >> integrating dlls.
