USB to RS-232 Serial Adapter DB9 – 8 Inch Short Cable

(7 customer reviews)


Windows 11 Compatible USB to Serial Adapter RS232 DB9 Short 8 Inch Cable. A great USB to serial cable adapter for travel, it uses screw lock tightening for secure connections to serial devices.


  • High-Speed USB to serial
  • Compact 8 inch length
  • USB 1.1 and 2.0 compliant
  • Plug and play technology
  • Supports Windows 7, 8, 10, and 11, Linux, OSX

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Model #: USA-FTDI-8 Categories: , Tag:

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USB to Serial RS-232

This standard USB to RS-232 Serial Adapter unit is compatible with most GPS and PDA devices including Garmin, Magellan, and Palm. Office equipment compatibility such as modems, printers, scanners, and digital cameras can use the USB to RS-232 DB9 short 8 inch cable. It features USB Plug and Play technology which allows easy installation and requires no IRQ, DMA, or I/O port resource configuration, it is USB 1.1 and 2.0 compliant. The USB to RS-232 Serial Adapter makes it possible for more single device connections attached to your system without the frustration of device and resource conflicts.

OS Support:

  • Windows 7, 8, 10, and Windows 11
  • Linux
  • Mac OS 10.X

Features & Specifications:

  • Hi-Speed USB to RS-232 Serial Adapter, PC, MAC, supports Cisco Break Sequence
  • No power supply needed, plug and play powered from USB port.
  • No IRQs, DMA or required. No IRQ Conflicts
  • 8 Inch cable
  • Baud rate: 300bps to 1Mbps
  • RS-232 output power: -5.7 to +5.7VDC
  • USB 1.1 and 2.0 compliant
  • Automatic send data control
  • Auto detection of data speed
  • Zero delay automatic transmission
  • Built-in static and surge protection up to 600W
  • Support for Windows 11

Package Contents:

  • USB to  RS-232 Serial Adapter (RS232 DB9 8 inch cable)
  • Latest FTDI Driver (available for download)
  • GM-FTDI-8 Product Manual (available for download)

Additional information

Weight .15 lbs
Dimensions 4 × 4 × .5 in




Cable Length


USB to RS232

Supported OS

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1 year from date of purchase.

Drivers & Manuals

7 reviews for USB to RS-232 Serial Adapter DB9 – 8 Inch Short Cable

  1. Michael Anderson

    Great Adapter for computers without Serial Ports, Purchased the Gearmo USB to Serial DB9 adapter to connect printers to laptops. The setup is easy and other than sometimes pulling out of the USB slots they work great.

  2. M. White

    Surprised me that it worked on OS X Yosemite without installing any drivers. I’ve used other serial USB interfaces (for arduino and similar projects) that required some tinkering to get working. This was literally just plug in, attach other end to Juniper console, and “screen /dev/cu.usbserial-xxxxx 9600” and I’m on the device.

  3. SteveL

    This adapter worked when several other brands did not. I was trying to upload an EIA file to a T32 control on a Mazak lathe. This adapter worked right out of the box.

  4. Anonymous

    WORKS GREAT! On my windows 7 64bit computer, it recognized and installed it threw windows update automatically with out need or use of the cd. I did have to go into “device manager”>”ports”> and click on the properties of the new device and change it from com3 to com1 for it to work properly with my palm device. otherwise it was stress free and easy to install even on my windows xp laptop, on the windows xp lap top running 32bit, it went threw the manual install, which followed the instructions provided in the pdf file on the cd. the windows xp computer was a breeze to get it installed on, a few clicks and it worked with my palm desktop software. no need to change it threw device manger from com3 to com1, on xp no settings needed to be changed in device manager, but on windows 7 64bit i did have to go into device manager to change it from com3 to com1 then enable com1 on my pamm desktop sync icon .

    No complaints. It’s well made and worked effortlessly on multiple computers.

  5. Chuck McBrayer

    I tried several products like this but have yet found one that worked as easy as this one. I recommend this product to anybody needing a serial adapter. The driver selection covers almost every OS including Mac. Again Great Product!

  6. Karen Hyde

    If you have windows 7 64 bit and need a USB to 9 Pin Serial adapter, then this is the adapter you want. It works. Unfortunately, I purchased a different version of a USB to 9 Pin Serial adapter that didn’t work properly. Learn from my mistake.

    *Reviewed at

  7. Magnum Opus

    I had a USB adapter that worked on windows 7 last year. When I hooked up the GPS this year it would not work. I was told by a techie that if I had automatic windows 7 updates, which we all do, that the old adapter would not work and I would need a 64 bit for windows 7 new adapter. I got it and loaded the program and it worked!! Who would have thunk it?

    *Reviewed at

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