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I've noticed that this driver does not do well with various settings on the scanner. I feel like if your settings are not exactly the same as those on the scanner for which this driver was written, you're going to encounter errors.

The main thing I've noticed about this driver is that it does not handle all of the errors and warnings that the scanner produces. I figured this out because warning_register_2_masks (ldmrsmsgs.py line 130) does not account for all 11 possible warning messages. If a warning is received that is not handled, it throws an unknown exception. This could be what you're seeing. I didn't check the other warning and error registers, but I feel as if those could also have a problem.