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RS232 to USB adapter cable with DB9 serial connector lets you connect RS232 devices to your computer’s USB port.
  • Supports data transfer speeds up to 230 Kbps—double the speed of a built-in serial port
  • Automatically reassigns COM values to each port to avoid additional configuration
  • USB-powered, so no bulky or obtrusive external power supply is required
  • Double shielding protects against EMI/RFI line noise that can distort or destroy data
  • FTDI chipset is compatible with Windows, Mac and Linux—works with most computers
  • 3-year limited warranty


Connects a Barcode Scanner or Other DTE Serial Device to Your Computer’s USB-A Port
This five-foot serial RS232 to USB adapter cable turns your computer’s USB port into an RS232 serial port and avoids the expense of upgrading your reliable serial devices. No external power source is needed. Just connect the cable to your computer and insert the included CD into your computer’s CD drive in order to launch the driver and assign the cable a COM port. It supports USB 2.0 specifications and data transfer speeds up to 230 Kbps, which is almost twice as fast as a built-in serial port. It is backward compatible with USB 1.1 devices.
COM Retention Feature for Convenient Reassigning of COM Values to Ports
The hot-swappable RS232-port-to-USB adapter with built-in FTDI chipset offers COM retention. It automatically reassigns the same COM port values to each port, so when the cable is disconnected or the system is rebooted, no additional configuration is needed. The cable also supports remote wake-up and power management.
Double Shielding Protects Your Data from Destructive Line Noise
Foil and braid shielding helps fight against electromagnetic interference and radio frequency interference (EMI/RFI) that impedes your signal and can distort or destroy data. The auto-sensing feature solves DCE/DTE conflicts without the need for cross-wired serial cables or adapters.
3-Year Warranty
The U209-005-COM is backed by a 3-year warranty, ensuring reliability and performance.

System Requirements

  • Windows, Mac or Linux
  • Computer with an available USB port

Package Includes

  • U209-005-COM RS232 to USB Adapter Cable, 5 ft.
  • Driver CD
  • Owner’s manual
RoHS compliant


UPC Code037332210227
TechnologySerial; USB
Host ConnectorUSB A (MALE)
Bus Powered  Yes
Number of Ports0
Side A - Connector 1USB A (MALE)
Side B - Connector 1DB9 (MALE)
Connector PlatingNickel
Contact Plating  Gold
Material of ConstructionPCB, PVC
Cable Jacket ColorBlack
Cable Jacket RatingVW-1
Cable Length (ft.)5
Cable Length (in.)60
Shipping Dimensions (hwd / in.)1.22 x 4.65 x 4.13
Shipping Weight (lbs.)0.24
Unit Dimensions (hwd / in.)1.220 x 4.650 x 4.130
Unit Packaging TypeBox
Unit Weight (lbs.)0.15
Operating Temperature Range32° to 140°F (0° to 60°C)
Storage Temperature Range-4° to 176°F (-20° to 80°C)
Relative Humidity0% to 80% RH, Non-Condensing
USB SpecificationUSB 2.0 (up to 480 Mbps)
Remote Wakeup SupportYes
Driver RequiredYes
Product CertificationsICES (Canada); NOM (Mexico)
Product ComplianceRoHS; CE (Europe); REACH; WEEE; FCC (USA)
Product Warranty Period (Worldwide)3-year limited warranty

Questions & Answers

COM retention allows the same COM port number to be automatically assigned each time the serial adapter is connected to a USB port on your system (or your system is rebooted). Without COM Retention, you would have to remember which port to connect the adapter.
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