[Elecraft] KIO2 RS-232 to USB?

[K2bew]

My computer does not have a 9 pin serial port. I have a 9 pin to USB
prolific cable/adapter that I use to connect my Ten-Tec RX320, that also
has a 9 pin serial port, to the computers USB.
The manual for the KIO2  says you can use a 24 pin to 9 pin adapter, but it
does not mention connecting to USB. Since the cable is so specialized for
the KIO2 to K2 can I connect it with the 9pin to USB prolific cable? I
don't want to short anything out etc...

Thanks and 73,
Tom Bewick, k2bew