| http://www.w3.org/ns/prov#value | - Find out if the usb adapter works with the old or new serial standard (the old is rs-232 needing +/- 12v for high/ low signals and the new is eia-232 which uses 5v/0v for high/low - your rs232 shifter changes the old standard to the new.) It may be something else but there is a chance that this is where youre problem lies.
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