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I believe the older models are serial, not USB, so you would have to get a USB to serial adapter and then the standard suuntu serial cable.
If you can't find a second-hand one, you could try one of these third-party cables. I bought mine from ebay (user 'itisnotmagic'); it's well built and does exactly what it should do.
I couldn't find "itisnotmagic" on ebay. Do you have a link to one of these guys? Unfortunately, the one you gave me is in "England".