Deat M. Lang,
I search about the problem that you posted.
On our web site, I found some informations and some helps about that:
The first thing is a page which explain the supported function of your device:
http://digital.ni.com/public.nsf/allkb/E1A44077DA6C819186257288006B76D7?OpenDocument
The next one is a Forum with some explanations about how to use the function:
http://forums.ni.com/ni/board/message?board.id=170&message.id=278249&requireLogin=False
Can you please send me more informations about the program, the driver and the versions that you use?
Have a nice day.
Matthieu