Keiner,
Can you provide more information on this issue? Or you can create a service request at http://www.ni.com/ask and choose either phone or e-mail.
At what point is it crashing? Does it happen at the same point/time each time you run the application. What version of LabVIEW are you using? Are you using VISA? Which version? Or are you using the old serial VIs? Are you using RS-232 or RS-485? Thank you.
Randy Hoskin
Applications Engineer
National Instruments
http://www.ni.com/ask