Might be an issue with port settings. I had a rough time of it with my notebook and had to adjust port settings for it to work with the USB adapter.
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Dutchman:I just bought the USB version. Dive Manager 2.3.0 / 6-15-06.
I have not yet been able to get the unit to recognize that the computer has been connected. It 'sees' my computer but it just will not connect for download. I also have done all the above. Real disappointing.