Achim:
I don't recognize that error code, and I think I ought to know it if anyone does. 🙂
Generally the codes listed in visa.h (and any other header files in the \WinXX\include directory) should be the comprehensive list of error codes you can get. Other modules that you have installed, such as instrument drivers, may define their own error codes, and the headers for those modules should be in that same directory as visa.h.
If this error code is coming from an NI driver, it would be helpful if you could provide an NI Spy log that shows the function being called, its parameters, etc. If it's a fairly small log file, you can attach it here; otherwise, send it to NI technical support.
If the error code is coming from an instrument driver rather
than an NI driver, then obviously we may not be able to help you. But at least this can help you pinpoint where the problem originates. By the way, instrument drivers are supposed to return errors that start with BFFC (not BFFF), so this specific code does look more like a VISA error code. But like I said, this isn't an error that NI-VISA or any NI Passport returns.
Dan Mondrik
National Instruments
