StarTech 1 Port USB - RS422/RS485 Serial Adapter

"Add an R422/485 serial port to your laptop or desktop computer through USB
The ICUSB422IS 1 Port Metal Industrial USB to RS422/RS485 Serial Adapter w/ Isolation connects to a computer using USB and allows you to connect any RS-422 or RS-485 serial device via the provided DB9 port or hard-wired to the terminal block. The USB to serial adapter features circuit isolation to ensure that sensitive controls and devices will not be damaged while connected, making it a viable solution for connecting costly industrial serial devices. The RS422/485 Converter receives full power via the host USB connection, and provides power to the attached serial device without requiring an external power adapter. Designed to provide a durable serial solution, the USB to RS422/485 Converter is ruggedly constructed and can be mounted nearly anywhere. Backed by a StarTech.com 2-year warranty and free lifetime technical support."
" * Rugged, USB Bus powered enclosure requiring no external power adapter for simple integration into harsh industrial environments
* Supports RS-485 and RS-422 serial interfaces via DB9 or Terminal Block connections for versatile connection options
* Circuit isolation provides electrical protection for sensitive, and often expensive industrial equipment"