1747-pic
The 1747-PIC will only work with a physical 9-pin serial port and is not reliable on WindowsXP.
You will want to purchase a 1747-UIC. It is a USB to DH485 converter. It will use any of the common serial cables used for DH485 including: 1761-CBL-PM02, 2711-NC13 and 1747-CP3. It also supports RJ45 connections using a 1747-C13 cable.