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USB to RS422 / RS485 Converter, Economy - DISCONTINUED

  • Model: XS850


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This product has been discontinued and replaced by part XS890

Low-cost standard USB to RS422 / RS485 adapter suitable for most older operating systems and applications, including industrial, commercial and any general office computer device.

This is a bi-directional, (meaning it communicates in both directions), basic and cost-effective converter that lets you connect any RS422 or RS485 device directly to your computer's USB port, efficiently converting USB signals to half-duplex RS485 signals and full-duplex RS422 signals and vice versa.
It is build around the PL-2303HX processor chip from Profilic which is a good all-round processor for general use with most older operating systems, however not recommended for complex systems and applications.

This USB to RS422 / RS485 adapter is powered from the USB port so no external power supply is needed. The RS422 / RS485 end is a standard 9-pin D-sub connector with a optional screw terminal board included for easy connection of cables or single wires.
Automatic send data control is enabled by default so no external flow or handshake control is needed.

Drivers for this USB to RS422 / RS485 adapter are fully compatible with Windows 98Se, ME, 2000, XP, Server 2003, Mac and older versions of Linux but has only limited compatibility with Windows 7 and Vista, (our Pro USB to RS422 / RS485 adapter is optimized and fully compatible with Windows Vista and Windows 7 and 8).

Overall features
  • Best for only older operating systems
  • Low-cost solution
  • USB port powered USB to RS485 converter
  • Terminal board included with each converter
  • Hexagonal nut stand-offs for connecting thumbscrews
  • Processor: Prolific PL2303HX

Useful optional accessories
(not included)

Null modem adapter
Null modem adapter

DB9 to RJ45 adapter
DB9 - RJ45 adapter

DB9 gender changer
Gender Changer

Part number XS850
Operating system
  • Windows 98, ME, 2000, XP32, Server 2003
    Since this is a low-cost adapter it has limited compatibility and is not recommended for Windows Vista, Windows 7 and it will not work with Windows 8
  • Mac OS X 8, 9, 10, 10.6
  • Linux
  • Windows CE 5.0
Processor Prolific PL2303HX
RS485 / RS422 Interface DB9 Male / included screw terminal header
USB interface Standard Type A Male
Indication LEDs No
Ports 1-port
Signals - RS485: D+, D-, GND
- RS422: TX+, RX-, TX+, RX-, GND
Power on pin 9 No
Baud rate 300bps to 115200bps
Parity None, Odd, Even, Mark, Space
Data Bits 5, 6, 7 or 8
Stop Bits One, one and a half, or two stop bits
TX / RX buffer size Configurable 512-byte bi-directional data buffer
- 256-byte outbound buffer and 256-byte inbound buffer; or
- 128-byte outbound buffer and 384-byte inbound buffer
Adjustable USB transfer sizes for TX and RX From 64 bytes to 4096 bytes
Flow Control None, Xon/Xoff, Hardware
COM port accessible by Included virtual COM port drivers
Electrostatic (ESD) protection 600W surge protection, 15KV static electricity protection
Current draw less than 100mA
Interface compliance USB1.1,2.0,3.0, EIA/TIA RS-232
Regulatory compliance FCC, CE and RoHS
Working temp -20°C to 60°C
Warranty 1 year limited warranty

For alternative USB to serial RS485 and RS422 solutions please see our full selection of USB to Serial RS485 converters

Read the Review
Date Added: 04/16/2010 by Mark Jensen
4 of 5 Stars!4 of 5 Stars!
Great device for a resonable price. It worked fine for me with Vista, even the description says that...

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Date Added: 01/04/2010 by Aaron Phillips
4 of 5 Stars!4 of 5 Stars!
good product, works fine with our equipment. Recommended.

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Date Added: 01/02/2010 by Bernt Andersson
4 of 5 Stars!4 of 5 Stars!
Drivers worked fine with XP. Good product considering the price.

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Date Added: 12/26/2009 by Mark Bentzen
5 of 5 Stars!5 of 5 Stars!
Easy to configure and connect. Have been using this successfully for several months without problems...

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Date Added: 12/26/2009 by
5 of 5 Stars!5 of 5 Stars!
Works perfectly with my device. Easy to setup and use. Thanks.

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