USB RS485 Converter - Mini PRO


Model: MWE820A
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This USB to RS485 / RS422 converter is similar to our XS885, the main difference is that the serial processor chip in this converter is a Silicon Labs CP2102 converter chip whereas the XS885 has a FTDI chip. Both processor chips are of equally high quality and performance however some customers prefer one over the other due to slight differences in the driver software features or application compatibility.

Another difference between this converter and the XS885 is that this converter has a light duty housing, made of fully transparent plastic which makes it ideal for laboratory, office and most consumer applications and projects.

As with the FTDI drivers, the Silicon Labs drivers also create a virtual COM port in your operating system's Device Manager which can be used as if it was a standard built-in serial COM port. The software drivers are compatible with all versions of Windows, Linux and Mac.

This converter is also electrically protected against static electricity, high voltage spikes and other high voltage spikes which potentially may damage your equipment and cause data loss or communications errors. The electrostatic protection is achieved by four high-speed TVS's (Transient Voltage Suppressors), one for each data line.

Overall features
  • Compatible with all version of Windows, Linux and Mac
  • Light duty commercial grade
  • RS485 and RS422 capabilities
  • Port powered from USB port
  • Baud rate: 300bps to 921.600bps, auto tuning
  • Indication lights for Power, RX and TX
  • Surge / static electrical protection up to 2500 Vrms/600W
  • 2 feet USB extension cable included
  • FCC, RoHS, CE certified

Model number MWE820A
Recommended operating system
  • Windows 10 32/64, Windows 8 32/64-bit, Windows 7 32/64-bit, Server 2008 32/64, Server 2008 R2, Vista 32/64-bit, XP, 2000, ME, 98
  • Linux
  • Mac OS 8, OS 9, OS X
Processor Silicon Labs CP2102
Baud rate 300-921.600bps, auto detection
Power Port powered from USB port
RS232 interface Terminal header
USB interface Male type A
Output voltage 4.7VDC (between D+ and GND)
Parity None, Odd, Even, Mark, Space
Data bits 7, 8
Stop Bits 1, 2
Flow Control None, Xon/Xoff, Hardware
Indication LEDs TX, RX and Power
Buffer size 576 Byte receive buffer; 640 byte transmit buffer
Serial signals RS422: TX-, TX+, RX-, RX+, GND (full duplex)
RS485: D-, D+ GND (half duplex)
USB signals VCC, DATA+, DATA-, GND, FG
Flow control Automatic. No IRQ Conflicts, no IRQs, IO or DMA required
Current draw
Less than100mA
ESD electrostatic protection 15KV / 600W/ms
Compliance EIA/TIA RS-232C, USB: v1.0, 1.1, 2.0
Operating humidity 5% To 95% - No Condensation
Operating Temp. -20° to 70°C
Certifications CE, FCC, RoHS
Warranty 2-year Limited Warranty
ECCN 4A994.a
Schedule B 8471.80.1000
HTS 8517.18.0050

For alternative solutions please see our selection of other USB to RS485 / RS422 converters

Useful accessories
serial accessories

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