USB to RS485 | RS422 Optically Isolated Industrial Serial Adapter


Optically Isolated Industrial USB to RS485 / RS422 serial adapter that is designed with DB-9, RJ45, and Terminal Screw Output interfaces. Used in serial applications such as serial printers, scanners, GPS, and consumer equipment.


USB to RS485 | RS422 Optically Isolated Industrial Serial Adapter image

FTDI is supported by Windows 10

USB to RS485 / RS422 Optically Isolated Industrial Serial Adapter converts between USB and other serial device signals. Some USB to serial adapter converter designs have special conversion features associated with the technology, the US-422i USB to RS485 adapter is compatible with RS422 signals.

The USB to RS422 serial adapter standard is an older communication protocol but is still utilized by many modern serial devices. It is often used for personal and office USB to serial adapter devices and recently, industrial applications. Most new computers do not have a COM port so a USB serial adapter is often used to connect many types of devices.

USB to RS485 Optically Isolated Industrial Serial Adapter circuit board image

The US-422i USB to RS485 serial adapter is a very useful device for connecting equipment such as serial adapter printers, scanners, scales and GPS devices, but also most serial business and consumer equipment requiring a USB interface. This is a RS485 and RS422 standards compliant adapter.

Many new USB to RS485 serial adapter devices today are designed with multiple variations of serial protocols which makes it very convenient since you then can use it for both RS422 and RS485 products.

The USB to serial adapter protocol itself has been used for many years and is very reliable. The USB to serial adapter is usually used in industrial environments, labs, office, and business; it is also commonly used as a consumer product for connecting USB serial products to personal computers.

USB to RS422 Optically Isolated Industrial Serial Adapter image

Features & Specifications:

  • Power 5VDC provided by USB cable
  • Installation DIN mounts (not included) or screws
  • Interfaces DB9, RJ45, screw terminal header
  • Housing Aluminum
  • Indication lights RX, TX and Power
  • USB interface compatible with USB 1.1 and 2.0
  • Baud rate  300bps – 1Mbps
  • Optical Isolation 2500Vrms / 500VDC isolation
  • ESD protection  15KV / 600W
  • Operating Temp. -40 to 85C

OS Support:

  • Win98, Me, XP, 2000, 2003, CE, Vista, 7, 8, and Windows 10
  • Linux
  • Mac OS 10.X


  • 97mm x 64mm x 26mm

Package Contents:

  • USB RS485 – RS422 Isolated Converter Unit
  • USB Type A to Type B Connection Cable
  • Latest FTDI Driver (available for download)
  • US-422i Product Manual

Additional information

Weight .5 lbs
Package Dimensions 6 x 4.5 x 1 in


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Cable Length


Supported OS

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1 year from date of purchase.

Drivers & Manuals

Latest FTDI Driver Download Button Latest FTDI Driver
Download Product Manual US-422i Product Manual


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