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.

This board convert USB to RS485 and TTL on the same board. Thereby allowing the control of both RS485 and TTL based motors at one time. It can be used to control Robotis TTL and RS485 based motors at ...

The repository provides a driver for setting up a mass flow controller of the SFC6XXX family or a gas flow sensor of the SFM6XXX family to run on a Raspberry Pi over UART using the SHDLC protocol.