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> Plus Mini
USB-COM Plus Mini ISO (655)

Main Features

  • USB 2.0 to 1 x RS232/422/485
  • High-Speed serial ports 921.6kbps
  • Driver for Windows, Linux, Mac OS X
  • LEDs for Power and TxD/RxD activity
  • ESD protection on USB and serial ports
  • 2.5kV electrical isolation (ISO version only)
  • Small metal housing and Bus powered
  • DIN-Rail and wall mountable
  • Wide range of operating temperatures

VScom USB-COM Plus Mini, a single port USB-to-Serial adapter for RS232/422/485 New


USB-COM Plus Mini

Quick Link: | Main Features | More Pictures | Overview | USB Interface | Serial Interface | Software | Power Requirement | Housing and Mounting | Environmental Data | Standards and Certifications | MTBF (Mean Time Between Failures) | Warranty | Ordering Information | Options | Packaging | Download |


  More Pictures

VScom USB-COM Plus Mini, a single port USB-to-Serial adapter for RS232/422/485     
Click on the thumbnails to enlarge them …

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USB-COM Plus Mini provides easy serial port expansion over USB 2.0 connecting to high speed RS232 or RS422/485 devices. The device is fully ESD and surge protected, bus powered and accommodated in a tiny metal case. Furthermore, it can operate across a large range of temperature levels to cope with harsh operating conditions. The ISO version is 2.5kV electrically isolated to withstand unbalanced ground loops that arise in hazardous industrial environment. Lastly, both DIN-Rail and wall-mounting options are available.

Flexible Three-Way Serial Ports

The serial port allows different operating modes — which are easily configured using the bottom DIP switch — to fully support RS232, RS422 and RS485 protocols. The differential line termination for RS485 (120Ω) is automatically controlled by choosing the appropriate operating mode. High/Low biasing resistors are not needed; as such, hassle-free usage is guaranteed for the user.
Com Port drivers are available for Windows, Linux and Mac OS X. A configuration tool allows easy access to special Windows driver options.

High Speed and Isolation

USB 2.0 full speed connection allows serial data rates of up to 3Mbps for RS422/485 and 921.6kbps for RS232. Every non-standard bitrate (e.g. 500kbps) can easily be set up in the range of up to 960 kbps.
The USB-COM Plus Mini is fully ESD and surge protected at the USB and serial port interfaces. Additionally, the serial port are 2.5kV electrically isolated (ISO-version only), making it ideal for deployment in hazardous industrial environments.

  USB Interface


USB 2.0 Full Speed, USB 1.1 compliant


USB type B



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  Serial Interface

No. of Ports/Type

1 x RS232/422/485 configured by DIP switch


DB-9 male


  • 16kV ESD surge protection
  • 2.5kV Electrical isolation on ISO version

Operating Modes

  • RS232
  • RS422 full duplex              (120Ω on/off)
  • RS485 4 wire, full duplex    (120Ω on/off)
  • RS485 2 wire, half duplex   (120Ω on/off)


One DIP switch sets the operating mode and RS422/485 termination
No High/Low biasing resistors needed

Signals non-ISO

  • RS232: TxD, RxD, RTS, CTS, DTR, DSR, DCD, RI, GND
  • RS422: Tx+/-, Rx+/-, GND
  • RS485 4-wire: Tx+/-, Rx+/-, GND
  • RS485 2-wire: Data+/-, GND

Signals ISO

  • RS232: TxD, RxD, RTS, CTS, GND
  • RS422: Tx+/-, Rx+/-, GND
  • RS485 4-wire: Tx+/-, Rx+/-, GND
  • RS485 2-wire: Data+/-, GND
All signals isolated for 2.5kV

RS485 Data Direction Control

ARTc (Automatic Receive Transmit control)

Data Bits

7, 8

Stop Bits

1, 2


None, Even, Odd, Mark, Space

Flow Control



  • RS232: 180bps - 921.6/1000kbps
  • RS422: up to 3Mbps
  • RS485: up to 3Mbps


bicolour TxD/RxD for each port

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  • Windows 2000 to Windows 10 (x86 and x64)
  • Windows Server 2000 to 2016 (x86 and x64)
  • Linux (Kernel 3.4 and later built-in)
  • Mac OS X


The driver is already installed (Linux), or installs by automatic Download after Device connection (Windows).

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  Power Requirement

Input Voltage

5V (USB)

Power Consumption

max 85mA, 420mW


USB Type B, bus powered, no external supply

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  Housing and Mounting


0.8mm sheet metal


150g, w/h box 0.3kg


50×72×22 mm³ (W×L×H) Case
72×72×22 mm³ (W×L×H) with mounting wings


85×122×55 mm³


  • DIN-Rail (optional)
  • Wall mount

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  Environmental Data

Operating Temp

−25°C - 75°C

Storage Temp

−30°C – 85°C

Ambient Humidity

5-95% non condensing

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  Standards and Certifications




  • EN 55022 Class B
  • 47 CFR FCC Part 15 Subpart B

EMS (EN 55024)

  • EN 61000-4-3: Radiated RFI
  • EN 61000-4-4: Electrical Fast Transient
  • EN 61000-4-5: Surge
  • EN 61000-4-6: Induced RFI
  • EN 61000-4-8: Power Frequency Magnetic Field
  • EN 61000-4-11: Power supply dips


EN 61000-4-2 4kV contact 8kV air for

  • Serial Port
  • USB

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  MTBF (Mean Time Between Failures)


available soon


Telcordia (Bellcore) Standard; RelCalc. 5.0 BELL-7

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Warranty Period

2 years

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  Ordering Information


USB-COM Plus Mini (1x RS232/422/485, non-isolated)


USB-COM Plus Mini ISO (1x RS232/422/485, isolated)

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DK 35A DIN-Rail mounting kit


DB9F-to-TB/10 for RS422/485 free wiring option


DB9F-to-RJ45 for changing from DB9 to CAT5 wiring
(Optimised for RS422/485 operating modes)


RJ45-to-DB9M for changing back from CAT5 to DB9 wiring
(Required to match the DB9 pinout at USB-COM Plus Mini)


Serial Null-Modem adapter 9PF-9PF, change male to female

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Packing list

  • USB-COM Plus Mini device
  • USB 2.0 High-Speed cable
  • 4 rubber feet for table mode

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 (v2.12.36.4 July 2021)
 (v2.08.30 July 2013)
 (Windows 2000 to 10)
 (Easy configuration and more)
 (Edition July 2017)
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* Specifications are subject to change without notice.
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