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.

Serial data converters are used to interconnect two different serial standards, such as RS232 to RS422, USB to RS232, etc. Interfaces, features, and environmental parameters are important ...

Did it have a little adapter in the box? There was a time when if you bought a USB mouse, in the box was ... it may well have come with an adapter for a 9-pin RS232 serial port.

The DSX-USB Communications Interface is a simple yet rugged USB converter. This port powered device connects to any 2.0 USB Port through the supplied cable. The module provides an RS-232 output ...