Add or Remove Programs entry for FTDI USB Serial Converter Drivers. This is a driver pack that allows USB ports to be used to connect to Serial bus devices with a USB - Serial adapter cable.

This file describes all of the currently plugged in USB serial devices. usbserinfo:1.0 driver:v1.4 0: module:keyspan name:"Keyspan 1 port adapter" vendor:06cd product:0119 num_ports:1 port:1 ...

A simple converter can be sourced online, but the only thing he could find locally that was even close was a USB to RS-232 converter. He used that component to craft his own USB to RS-485 bridge.