Problem of installing USB device

[Dennis_Knutson]

What I want to emphasize is that if you use a driver provided by the vendor, you will be communicating through USB. A vendor will usually provide a dll or sometimes an ActiveX component that you can use. The dll can be interfaced with LabVIEW's Call Library Function Node. If there is no dll, then, and only then should you try the VISA wizard. And when you use VISA, then you need to get details from the vendor on how to use USB RAW to communicate. It is much more than sending the same commands that you would use for serial. You need to know information such as endpoints and pipes. Have they provided this to you?

[flypeng]

I think the dll vedor offer is for the driver of window, without any other file, such as manual or header, it may not suit the labview, so the labview always crashes when call this dll.I am trying to ask the vendor for more information about this dll. Actually I am very new to Labview, thank you for your help, I think I have found the right track for the problem.