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Ahh... We ran into this issue with a similar PS-Series Toledo scale a while back. As I recall, it was a setting that had to be changed on the scale so that it sent the data in the format that our shipping application was looking for.
That may (or may not be) your issue here. Have you looked over any of the Mettler-Toledo troubleshooting documentation? Let me see... Try to check the 'Proto' setting depicted on page 37 of this guide: http://us.mt.com/us/en/home/supportive_content/product_documentation/operating_instructions/PS_Man_Genl/_jcr_content/download/file/file.res/64067860%20PS%20scales%20Operation%20and%20Technical%20Manual.pdf
I'm assuming it needs to be set to Fedex. There are probably some other settings you'll want to confirm there as well, as the FedEx software may be expecting a different baud rate and different data bit/parity/stop bit settings than what the defaults are.
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Failing that, are you able to switch it over to serial instead of USB? Page 53 describes a good way to test the serial communication using terminal emulation software like HyperTerminal/PuTTY, etc.