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USB to RS485 Converter, Mini Ultimate

  • Part: US485MIO


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This product has been discontinued and
replaced by part MWE820A which has
better performance and stability.

Small and convenient USB-RS485 Converter which is port powered so there is no need for any external power supply. It has a surge and static protection of up to 600W.

This USB-RS485 converter is build around the high performance and very reliable CP2102 chip from Silicon Labs, which makes it a bit higher priced but also a very reliable converter which is is optimized and fully compatible with all versions of Windows, Linux and Mac.

This converter 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 RS485 device directly to your computer's USB port, efficiently converting USB signals to half-duplex RS485 and vice versa.

This high performance USB-RS485 converter is powered from the USB port so no external power supply is needed.

The RS485 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 required.

It can be used in point to point or point to multipoint networks with up to 32 nodes. The estimated communication distance is up to 9800 FT (3km) at 4800bps, 6500 FT (2km) at 9600bps or 3200 FT (1km) at 115.2Kbps.

Overall features
  • USB port-powered USB-RS485 Converter
  • Indication lights for RX and TX
  • Output 1: RS485 2 wire half duplex
  • Up to 32 nodes in network configuration
  • Surge and static electrical protection up to 600W

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 US485MIO
Operating system
  • Windows 8.1 / 8 (32/64-bit), Windows 7 (32/64-bit), Vista (32/64-bit), XP, 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
Processor Silicon Labs CP2102
RS485 output power 4.40VDC (between Data and GND)
RS485 / RS422 Interface Screw terminal block
Fail-safe bias resistors Yes
Signals RS485, 2-wire half duplex: D+, D-, GND
Compatible with Modbus RTU/ASCII, BACnet
Bias resistors Yes
USB interface Standard Type B Female
Indication LEDs Power, Send and Receive
Baud rate 300 to 921600bps
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
Working temp -20 to 70C
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: 04/15/2013 by Jeffrey White
4 of 5 Stars4 of 5 Stars
This converter is working well with our pressure sensors. The small size and overall reliability is ...

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Date Added: 12/26/2009 by Paul Vodak
5 of 5 Stars5 of 5 Stars
I bought this mini adapter and the cable version, both works great with Windows Vista.

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Date Added: 12/26/2009 by Mark Bentzen
4 of 5 Stars4 of 5 Stars
Very satisfied with the product. Thanks a lot.

Read the Review
Date Added: 12/26/2009 by John Hansson
5 of 5 Stars5 of 5 Stars
Very convenient and effective small converter. Have been using it successfully with our company's pr...

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Quick Tip!

A USB-RS485 Converter with only one purpose.

This USB-RS485 Converter is designed around the high quality CP2102 processor ship from Silicon Labs. The advantage of this processor is that it is made in particular for converters like this USB-RS485 converter. This means that when you use this converter you no only have a high quality converter you also have a product which is actually designed for converting only USB to serial RS485 data.

Some processors are designed with not only RS485 conversion in mind but also RS422 and RS232 and can be used for several different applications, however most of them with less precision and reliability due to the multi-level design. With this USB-RS485 converter you get exactly what you need and nothing else, which is what makes this USB-RS485 converter highly reliable and gives you the results you need with an extremely low error rate.

For alternative serial solutions please see our selection of USB to RS485 converters.


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