Startech USB-C to RS-232 Serial DB9 Adapter Cable, M/M w/ COM Retention

MX72211 USB-C to RS-232 Serial DB9 Adapter Cable, M/M w/ COM Retention
MX72211 USB-C to RS-232 Serial DB9 Adapter Cable, M/M w/ COM Retention MX72211 USB-C to RS-232 Serial DB9 Adapter Cable, M/M w/ COM Retention

Product Info

USB-C to Serial Adapter with COM Retention

Add a serial port with this USB C to serial with COM port retention

This USB-C™ to serial adapter lets you connect your USB-C™ devices to your legacy serial equipment. It converts a USB-C™ port on your laptop or computer into an RS232 DB9 serial port with COM port retention. This gives you a cost-saving and convenient way to connect to serial devices such as point-of-sale terminals, serial modems, industrial equipment, and a wide variety of other RS232 peripherals.

  • USB-C™ to straight-through RS232 DB9 serial adapter
  • High-speed 921.6Kbps Baud Rate
  • COM port assignments maintained across reboot
  • Supports remote wake up and power management control
  • Compatible with Windows®, macOS® and Linux®
  • Provides dual buffers for upstream and downstream data transfer
  • USB-powered: No external power adapter required
  • Perfect for IT Administrators looking to add legacy functionality to newer notebooks, PCs and servers that lack an integrated RS232 port
  • Connect, monitor and control industrial/automotive sensors and equipment
  • Connect bar code scanners, receipt printers and other point-of-sale devices
  • Connect a satellite receiver, serial modem, or PDA with serial sync
  • Connect and program LED and digital signage boards with serial communication ports


Connect with Ease

The RS232 adapter cable is compatible with Windows®, macOS® and Linux® operating systems, which makes it easy to integrate into mixed environments.

Built-in Convenience

A time-saving and convenient USB/serial solution, the adapter retains assigned serial COM port values in nonvolatile memory, allowing the same values to automatically be re-assigned to the adapter serial port if disconnected and reconnected, or disconnected from one USB port and installed in another.

The USB-C™ serial cable also supports advanced features like remote wake-up and power management control.

The ICUSB232PROC is backed by a 2-year warranty and free lifetime technical support.


  • Windows® 7, 8.1, 10
  • Windows Server® 2008 R2, 2012 R2, 2016
  • Mac OS® 10.11 and 10.13
  • Linux 2.6.x to 4.4.x LTS Versions only


  • One available USB Type-C™ port


Product USB-C Serial Adapter Cable w/ COM Retention
Part Number ICUSB232PROC
Cable Colour Black
Bus Type USB-C
Standards USB 1.1/2.0 RS232
Interface Serial
Port Style Cable Adapters
Port 1
Connectors 1 x USB Type-C (24-pin) USB 2.0 Male
1 x DB-9 (9 pin, D-Sub) Male
Data Bits 5, 6, 7, 8
FIFO 512 Bytes
Flow Control None, Xon/Xoff, RTS/CTS, DTR/DSR
Max Baud Rate 921.6 Kbps
Parity Odd, Even, Mark, Space, or None Parity Modes
Serial Protocol RS-232
Stop Bits 1, 1.5, 2
MTBF 30,000 hours
Power USB-powered
Temperature Operating: -10°C to 80°C (14°F to 176°F)
Storage: -20°C to 100°C (-4°F to 212°F)
Humidity 5 to 85% RH
Certifications CE, FCC, RoHS Compliant
Dimensions (WxHxL) 1.4" x 0.8" 16.9" (35 x 20 x 428 mm)
Weight 36g

Package Contents

  • StarTech USB-C Serial Adapter Cable w/ ROM Retention
  • Quick Start Guide