Hello,
You should be able to use the Help documentation to write an application to communicate with your USB device.
Please navigate to Start > Programs > National Instruments > VISA > Documentation > NI-VISA Help
Type USB into the search field the first two topics should get you up and running.
For USB RAW Bulk transfer use the VISA Read and Write, you can follow the template set out
in the general VISA Examples folder (Start > Programs > National Instruments > VISA > Examples > C > General).
Christian A
National Instruments
Applications Engineer