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USB to RS485 / RS422 Converter, Mini PRO

  • Model: MWE820A
  • In Stock


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Mini USB to RS-485 / RS-422 converter similar to part US485MIO, however this converter also offers RS422 communication.

This surge and static protected USB to RS-485 / RS-422 converter is powered from the USB port so there is no need for an external power supply.
It is designed around the high performance and very reliable CP2102 chip from Silicon Labs, so it is compatible with all verisons of Windows, Mac and Linux.

This particular USB to RS-485 / USB to RS-422 adapter is suitable for most applications, including industrial, commercial and any general office computer device. It is a bi-directional, (meaning it communicates in both directions), reliable and cost-effective converter that easily lets you connect any RS-485 or RS-422 device directly to your computer's USB port, efficiently converting USB signals to half-duplex RS-485 or full-duplex RS-422 and vice versa.

The RS-485 / RS-422 end is a standard 4-screw terminal header for easy connection of single wires.
Automatic send data control is enabled by default so no external flow or handshake control is needed.

Point to point or point to multipoint networks with up to 32 nodes can be used with this converter.
The typical communication distance is up to 9800 FT (3km) at 4800bps and 6500 FT (2km) at 9600bps.

Overall features
  • USB port-powered converter
  • Supports RS485 and RS422
  • 2 feet USB extension cable included
  • Indication lights for RX and TX
  • Up to 32 nodes in network configuration
  • Protected against electrostatic voltages

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 MWE820A
Operating system
  • Windows 11, 10, Windows 8.1 / 8 (32/64-bit), Windows 7 (32/64-bit), Vista (32/64-bit), XP 32/64, Server 2003, 2000, ME, 98Se (all WHQL compliant)
  • Linux 2.6.x, 3.x.x
  • Mac OS X 10.4, 10.5, 10.6, 10.7 and 10.8.
  • Windows CE 5.0, 6.0
  • Android 4.2
Processor Silicon Labs CP2102
RS485 transceiver VP3082 (SN65HVD3082EDR)
RS485 output power 4.7VDC (between D+ and GND)
RS485 / RS422 Interface Screw terminal block
Fail-safe bias resistors Yes
Signals RS485, 2-wire half duplex: D+, D-, GND
RS422, 4-wire full duplex: TX+, TX-, RX+, RX-, GND
Compatible with Modbus RTU/ASCII, BACnet
Bias resistors Yes
USB interface Standard type A male
Indication LEDs Power, Send and Receive
Baud rate 300 to 115200bps
Parity None, Odd, Even, Mark, Space
Data Bits 5, 6, 7, 8
Stop Bits 1, 1.5, 2
TX / RX buffer size 640 byte transmit buffer, 576 byte receive buffer
Flow Control Hardware or Xon / Xoff
COM port accessible by Included virtual COM port drivers
Special features - Event character support
- Line break transmission
- Automatic Send Control
Electrostatic (ESD) protection 15KV/ 600W/ms high voltage protection
Current draw Static: less than 80mA. Dynamic average: less than 150mA
Dimensions 65 x 22 x 12mm
Interface compliance USB1.1, 2.0, 3.0, EIA/TIA RS-232
Regulatory compliance FCC, CE and RoHS
Operating temp -4°F to 158°F (-20°C to 70°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: 11/23/2014 by Ron Julian
4 of 5 Stars!4 of 5 Stars!
works! .. and thanks for the speedy shipping..

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Date Added: 04/13/2013 by Chris Hauser
5 of 5 Stars!5 of 5 Stars!
Nice little converter, works without problems with our temp controllers. Would have been nice with a...

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Date Added: 07/14/2011 by David Smith
5 of 5 Stars!5 of 5 Stars!
absolutely satisfied! this little rs485 converter might be a little pricy but its well worth it. As ...

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Date Added: 07/12/2010 by Mike Johnson
5 of 5 Stars!5 of 5 Stars!
works fine with windows 7. definately a useful little adapter considering the price

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Date Added: 01/03/2010 by Jack Zane
4 of 5 Stars!4 of 5 Stars!
Very convenient and small converter. Works fine with my application.

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