I'm passing this info along for those who may have a K2 and find this useful.

FTDI makes a USB to RS-232 Cable Part Number: USB-RS232-WE-1800-BT-0.0
The cable has a USB plug on one end and is terminated in wires on the other end.
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Here is the Pin-out to make a USB to K2 Cable

Color - Signal - Notes
Yellow - RXD - Pin 2 on 9 Pin Connector - RS-232 Data In From K2
Orange - TXD - Pin 3 on 9 Pin Connector - RS-232 Data Out To K2
Black - Gnd - Pin 5 on 9 Pin Connector - Ground
Green - RTS - Tied to CTS Line
Brown - CTS - Tied to RTC Line
Red - Power - Unused - 0.0v
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