I was not able to get the Prolific chip in my Medical device's cable to work, I tried older drivers and everything, Nothing worked, it simply would not connect.
They sent me (Free of charge) a new cable with an FTDI chip and WHAM, connected.
I spent a good week trying to get that old cable to work, Multiple calls to customer assistance, New Driver CD with teh proper drivers, and everything.. Downloaded and installed older versions of the drivers, everything, Nothing worked.
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