How to make Labview driver for USB devices that do not provide remote control commands?

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Hi, everyone. I am using an NEC IRV-T0831C infrared camera to snap some experiment results. The manufactor provides a software (installed on a labtop) to control and read data from the camera through a USB port (there is only one USB port on the camera for data communication). However, the mannual and the manufactor do not provide any remote control command lists. That is, I could not remote control the camera through the conventionally way such as "VISA write" and "VISA read".

But as long as the software can control  the camera, I believe there must be some way to use Labview to fulfill the same remote control functions as the software does (at least theoretically). Could anyone help me about this issue, for example, how to listen to the USB port, receive the command from the labtop, and receive the response from the camera?

If this could be done, I could use the software provided by the manufactor to control the camera first, and at the same time, listen the USB port, and maybe possible to find out the useful command I wish to use.

Thank you!

[mkossmann]

You might  try USB sniffers like usbsnoop or usblyzer. But reengeering a unknown protocol is a difficult task.

Did you allready check if the manufactorers controlsoftware doesn't include an interface like Active-X, which makes this software remote controlable ? 

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I have tried to open the .exe file of the software through a "System exec .vi" way (and I do it successfully). However, this is almost the same as I directly use the software to control the device, which is rather time consuming (I have to click the mouse to snap the data, then to input the file name to save the data, and then to click mouse again to save the data to file). That's why I really want to know the control protocals of the device, so that I could carry an automatic measurement for real time (less than 0.2 seconds to snap one figure) monitoring. Frankly, it is weird that the manufacturer provides a control software, while do not provide any remote commands. 

Anyway, thank you for your help.