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Testimonials
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The U12 has been an absolutely essential piece of hardware in my experimental projects. It's performed exceptionally well and I've recommended the device to several of my colleagues.
—Brendon, Electrical Engineer
#1
Because of how Windows controls handles for USB devices using the WinUSB driver, only one program can have one of those USB devices open for communicating at a time. That is why LabView must be closed before another application can speak to the device. The same would be true for any two programs (or even two copies of the same program).
The close function should allow you to get around that, but it shouldn't be necessary.
Generally, if you need more than one application to communicate with the LabJack, we recommend that you create a 3rd program that handles all the communication (and is always open) and then have the other two programs communicate with that one to pass data back and forth.
You don't need to pass anything to the close() function.