Communicate with USB port of computers!
If your computer don’t have a RS232 Port to connect with Controller,Maybe you need a USB to RS232 Converter.
Serial RS232 to USB adapter/converter. Use your serial devices with your USB equipped computer. Serial port connector is DB9.
Requirements:
Windows XP or Windows 98, Windows ME and Windows 2000, and Vista.
Package Content:
Hardware:USB-Serial(DB9)Cable
Software:USB-Serial driver on CD-ROM
Product Features:
USB Specification Rev1.1 and 2.0 Compliant
Weight : 0.10 lbs
PC RS232 Cable
PC RS232 Cable,Connect Kelly 
Controller RS-232 Converter to PC.
This is a standard RS232 cable.
Length:50 inches
Weight : 0.10 lbs