6ft. USB 2.0 to RS-232 DB-9 Serial Adapter w/ 15kV ESD Protection & FTDI Chipset

RS-232 | 128 Bytes Receive | 256 Bytes Transmit | FTDI

  • Expand Your Serial Capabilities: Connect your legacy 9-pin serial device through a USB-A port to add legacy functionality to newer technologies with no serial port connections.
  • Safe Connections: Designed with a unique system load reduction feature, the Mini USB to Serial Adapter also offers 15kV ESD protection for connected devices.
  • Plug-&-Play: The adapter’s power is drawn from a USB connection for ease of access and is compatible with Windows (up to Win 11), Mac OS, and Linux.
  • COM Retention: COM Ports are fully configurable, and after reboots, port assignments are preserved.
  • Upstream: 1 USB port, Type A Male Connector
  • Downstream: 1 Male DB9, w/ nuts
  • LEDs: Power, TX / RX

$27.95

(15 customer reviews)

In stock

View Volume Pricing

Units Price
1 - 4 $27.95
5 - 11 $27.11
12 - 24 $26.55
25 - 49 $25.99
50+ $25.16

Also available from:

Model No. USBG-232MM

Description


Use your Laptop or Desktop computer’s USB technology to synchronize your new serial device or device currently using a serial port with this USB to RS-232 Serial Adapter. This USBG-232MM serial adapter adds a serial port to the computer, laptop, or tablet PC via a hot plug compatible USB connector. Using an existing USB Port the adapter can be utilized to work with your legacy serial connections. It’s great for newer Laptop and PC technologies with no serial port connections.

USB to RS-232 Serial Adapter for windows image

The combination of RS-232 Serial Adapter communication protocol with USB technology allows further use of existing devices, even when your computer may not offer serial ports currently. The high-speed RS-232 serial port with 128 byte FIFO allows for high-speed communication, even in heavily loaded systems. This serial adapter also allows unusual speed settings of up to 500.000bps. The USBG-232MM USB to RS-232 Serial Adapter also features TxD and RxD LEDs that are located on the DB-9 Male end of the cable. (pictured below)

 

Features:

  • Adds one RS-232 serial port by connecting to a USB port.
  • Compact size cable type converter with cable length of 6 feet.
  • Installed as standard Windows COM port
  • Full RS-232 modem control signals and hardware/software flow control
  • RS-232 data signals: TxD, RxD, RTS, CTS, DSR, DTR, DCD, RI, GND
  • High speed serial port with the baud rate up to 921.6K bps
  • Transmit Buffer: 512 bytes
  • Receive Buffer: 512 bytes
  • Non-standard baudrates supported
  • LED status indicators for TxD and RxD for easy port monitoring and diagnostic
  • Serial port protected with ESD protection of 15KV
  • Powered by USB port, no external power adapter required
  • Easy plug and play installation and RS-232 device connection
  • COM port number assigned can be changed to any COM port number required
  • Works with USB 1.1 & 2.0 host port

OS Support:

  • Windows 7, 8, 10, and Windows 11
  • Linux and Mac OS 10.X
  • Note: As of June 2018 Windows XP is no longer supported. Please contact us if you require Windows XP support.

Package Contents:

  • USB to Rs232 6ft. cable adapter
  • Driver Disc

Compatibility List:

GPS / Chartplotters / Fish Finders:

  • Magellan Sportrak GPS
  • Garmin GPS III Plus
  • Garmin eTrex Legend
  • Garmin 76S GPS
  • Garmin Rino 120
  • Garmin Etrex
  • Garmin GPS V
  • Peets weather station
  • Sky Caddie
  • SkyCaddie SG2 Golf GPS
  • Humminbird 767
  • Megellan MAP330

WEATHER STATION:

  • Oregon Scientific WMR-968
  • La Crosse WS-3610
  • Davis Vantage Pro II weather station

AMATEUR RADIO:

  • Yaseu FT-950 Amateur Radio
  • Kenwood TM-D710 ham radio
  • TenTec RX320 shortwave radio receiver
  • Kenwood TM-D710 dual band Amateur radio

Routers:     (Connects to Cisco Console cable)

  • Cisco 871
    Cisco 2900/3900 XL
    Cisco ASA5505
    Cisco 678 DSL
    Cisco 2621XM

MODEMS:

  • US Robotics Courier dual standard V.34
  • Zoom 56k external fax modem

Embroidery Machines:

  • Bernina 180 embroidery machine

OBDII Data Analyers:

  • Innova 3140 / 3160 OBD2
  • Equus 3130 Innova Diagnostic Code Scanner
  • Autel MaxiDAS

Telescopes / Solar Controllers:

  • TS-60 Morningstar Solar Controller
  • Celestron 5SE Telescope
  • Celestron CGEM astronomy tracking mount

POLICE SCANNER RADIO:

  • Uniden BCD396XT programmable radio
  • Uniden 780XLT scanner
  • Uniden Bearcat BC346XT scanner

Stenograph Writers:

  • Stentura 200SRT
  • Stentura 400SRT
  • Stentura 500
  • Stentura 6000
  • Stentura 6000LX
  • Stentura 8000
  • Stentura 8000LX
  • WAVE
  • DIAMANTE

INDUSTRIAL EQUIPMENT:

  • Brother wire EDM machine
  • Graphtec plotter

MegaSquirt car tuning
SBC ALIX Firewall
Lynx6 AL5B robot arm (Karmic RC) Matlab 2009b
Pelouze scale
DVDO iScan Duo

CNC Machines:

  • Strippit HECC80-3 CNC

PlusDeck
Suunto X6HR watch
Altec Digitizer Tablet
Data Logging Digital Multi-meter
Conext uninterrupted power supply
Automation System SLC 500
Keile Micro Controller
SEL-751A relays (needs null modem adapter & acselerator software )
URC remote controls MX-850
Summa Graphics D15 vinyl cutter

AUDIO DEVICES:

  • Anthem MRX 300 A/V receiver
  • Anthem MRX 500 receiver
  • NuVo music system

APRS unit (Byonics RTG
iRobot Create
FreeScale Codewarrior
Technological Arts Adapt9S12C32 MCU
X10 CM11A
Crestron programmer
Zebra Label Printers

Specifications

Product Specifications

Power
External Power Required

No

Compliance
Country of Origin

Taiwan

Certifications

,

Mechanical
Color

Blue

Length

6ft

Ports

1 Serial Port

Material of Construction

Plastic

USB
USB Type

USB 2.0

Screw Lock Compatible

Yes

Serial Attributes
RS Signals

DCD, RxD, TxD, DTR, GND, DSR, RTS, CTS, RI

Serial Standards

RS232

Baud Rate

921.6K bps

FIFO Receive

512 bytes

FIFO Transmit

512 bytes

Data Bits

7, 8

Parity

None, Even, Odd, Mark, Space

Stop Bits

1, 2

Flow Control

Hardware (RTS, CTS), XON/XOFF

Software
OS Support

Win 11, Linux, Mac OSX, Win 10, Win 7, Win 8

Environmental
Operating Temperature

0°C to 55°C (32°F to 131°F)

Storage Temperature

-20 to 75°C (-4 to 167°F)

Humidity

5% ~ 95% (non-condensing)

Product Information
Warranty

1 year from date of purchase

Hardware
Chipset

FTDI

LED Indicators

Power, TX / RX

Performance
ESD Protection

15KV Surge Protection

Max Data Transfer Rate

12Mbps

Other Data
Connector

DB9 Male w/ Nuts

Chip Model

FT231XQ-R

UPC

736983909022

Weight

.28 lbs

Dimensions

5 × 5.5 × 1 in

UPC: 729440625290
Pin-Outs

DB9 RS-232 Pin-Outs

DB9 RS-232 Pin-Out Diagram
DB9 RS-232 Pin-Out Chart
Serial F.A.Q.

Product F.A.Q.

View frequently asked product questions below. For all serial troubleshooting, visit this page.
Still need help? Reach out!

  • How do I clean and reinstall my FTDI drivers?
      1. Download the CDM Uninstaller HERE.
      2. Extract the zip file, or open the “CDMuninstallerGUI.exe” utility.
      3. Leave the ‘Vendor ID’ set to 0403 and ‘Product ID’ set to 6001.
      4. Click Add.
      5. Click Remove Devices.
      6. Download the corresponding driver for your operating system and follow on-screen prompts. Windows Driver | MacOS Driver

    Video tutorial here.

  • How can I change my device’s COM port?
      1. Click on Start and navigate to the Control Panel
      2. Locate and click on Device Manager
      3. Under “Ports (COM & LPT)” you will find your serial device titled “USB Serial Port” along with its current COM Port.
      4. Right click on “USB Serial Port” and click on Properties.
      5. Navigate to the “Port Settings” tab and click on “Advanced…”
      6. Once there, the “COM Port Number:” can be changed with a dropdown menu to select the port number.
      7. Click your desired port number (i.e. COM2) and click “OK”.
      8. Click “OK” once more.
      9. Your serial device is now assigned to your chosen COM Port.

     

  • How do I check to ensure the COM port is listed properly in Windows?
    To ensure your serial device is installed properly, complete the following:

    1. Press Windows Key + R to open the Device Manager. Once Run comes up, type “devmgmt.msc” into the text field and press Enter.
    2. Expand the section labeled, Ports (COM & LPT).
    3. You should now see a COM number in brackets to the right of each port. If the device is installed properly, no exclamation points or question marks should be present next to the device.
  • I have everything hooked up, but nothing is functioning correctly.
    To rule out potential issues, quickly test your individual components to ensure that they are working correctly individually, and are not the source of the problem:

    • Serial cables
    • Serial ports
    • Serial devices

    Test your components by:

    • Hook up the serial cable(s), serial port(s), and serial device(s) in a different setup to see if the issue stems from a particular component, or the setup as a whole.
    • Replace the serial cable, port, or device within your setup to further troubleshoot the issue’s origin.

    When testing cables:

    • Test each cable individually.
    • Use short cables when you are testing.

    When testing serial ports and devices:

    • Press the Windows key + R, in Run, type devmgmt.msc, and press Enter to open the Device Manager. You can then check to see if your device is listed under Ports (COM & LPT).
    • Ensure that the COM port number is the correct number for the serial device and that the software being used to connect the computer to the serial device uses the correct COM port number.
    • If the device is listed with an error, follow the instructions on the website to reinstall the drivers.
  • Serial communication is not functioning correctly, how can I tell if the problem caused by the adapter or my serial software application?
    Older serial communication applications make use of legacy hardware addresses, often incompatible with PCI, PCIe, and USB to Serial products. Contact the software provider to troubleshoot.
  • I am receiving an error when I try to install the drivers in Windows 8 64 bit.
    Driver Signature Enforcement in Windows 8 may need to be disabled in order to use various drivers. After disabling this feature, the driver will be allowed to install.

    Note: You are required to restart your computer after disabling the Driver Signature Enforcement. Save all open work on your computer.

    Disable driver signature enforcement:

    1. Press the Windows key + C.
    2. Click Settings > Change PC Settings.
    3. In the left pane, click General.
    4. In the right pane, under Advanced startup, click Restart now.

    When your system restarts:

    1. Click Troubleshoot > Advanced options > Startup Settings > Restart.
    2. Press 7.

    When your computer restarts, Driver Signature Enforcement will be disabled and you can install the drivers.

  • I am receiving an error when I try to install the drivers in Windows 10 64 bit.
    Driver Signature Enforcement in Windows 10 may need to be disabled in order to use various drivers. After disabling this feature, the driver will be allowed to install.

    Note: You are required to restart your computer after disabling the Driver Signature Enforcement. Save all open work on your computer.

    Disable Driver Signature Enforcement:

    1. Click the Windows icon in the taskbar.
    2. Click Power.
    3. Press and hold the Shift key and click Restart.

    After your computer restarts:

    1. Click Troubleshoot Advanced Options Startup Settings Restart.
    2. Press 7.

    When your computer restarts, Driver Signature Enforcement will be disabled and you can install the drivers.

  • Why did the software not install properly in macOS High Sierra (10.13) or later?
    High Sierra 10.13 and later versions of macOS enforce strict security policy revisions. In order for the device to operate, software packages like those used in this installation must be allowed in macOS Security and Privacy settings once the software is installed.

    Once the driver/software is installed, follow these steps to allow the software:

    1. Open System Preferences.
    2. Open Security & Privacy.
    3. Click the Allow button near the bottom of the General tab.
Reviews (15)

15 reviews for 6ft. USB 2.0 to RS-232 DB-9 Serial Adapter w/ 15kV ESD Protection & FTDI Chipset

  1. IvanSonia

    Holy Toledo, so glad I clicked on this site first!

  2. Paul

    No issues so far.

  3. Robert Nemeth

    requires microsoft programs no longer available for either my Vista or XP Operating systems (on two separate PCs) – I had to buy an older PC with a built in serial comm port instead

  4. Ed Endo

    good product quick delivery

  5. Janet E. Wright

    After I realized I was trying to connect it backwards, it worked great!

Add a review

Optional Accessories

Optional Accessories

The USB to RS232 Adapter Cable has certain accessories that work with it. These accessories are what you can order if needed.

RS232 Male to Female Serial Data Cable Complete your serial data connection with this 5ft. RS232 DB-9 Male to Female data cable for fast reliable…

Model# 9DBMF5FT

$2.95

In stock

Add to cart

← Back

Sales Support

Technical Support

Name(Required)
Address

What Product Do You Need Help With?

When did you purchase this product?

Application Information.

What environment / application is your product used in? (Select all that apply)

What is Your Problem?

Volume Pricing

[contact-form-7 id="15753" title="Volume Pricing Form"]

Support

Need help with a Coolgear product you’ve purchased? Get product support from our on-site engineers.

+1 (727) 209-1300
Mon - Fri: 9 AM - 5 PM EST

Sales

Contact our sales team for assistance before you buy a Coolgear product.

+1 (727) 209-1301
Mon - Fri: 9 AM - 5 PM EST

Quick Links

Resource Center
Find helpful links, articles, and learning resources.
Quotes & Volume Pricing
Contact our sales team for quotes or quantity pricing.
Returns & Claims
Begin the return process and fill out an RMA form.
Purchase Orders
Looking to place a purchase order? Learn how, here!
HURRICANE IAN NOTIFICATION
Due to severe weather conditions and for the safety of our staff, Coolgear offices will be closed on Wednesday, September 28th and remain closed until deemed safe to reopen by local authorities.

Our email, phone and chat lines will continue to be monitored as much as possible, however, our warehouse facility will be closed for outbound shipments, deliveries, and other business. We expect to be able to reopen shortly after Hurricane Ian passes and will resume normal operations at that time.

Please continue to check back for updates. We do apologize for any inconvenience this may cause.