2-Port USB 2.0 to RS-232 DB-9 Serial Adapter w/ 15kV Surge Protection & 3 ft. USB Extension Cable

RS-232 | 128 Bytes Receive | 384 Bytes Transmit | FTDI

  • Expand Your Serial Capabilities: Connect 2 legacy 9-pin serial devices 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 surge 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.
  • Small Footprint Design: Use the small Serial Adapter on its own for portability or use the detachable 3 ft. cable for extended connections.
  • COM Retention: COM Ports are fully configurable, and after reboots, port assignments are preserved.
  • Upstream: 1 USB port, Type A Male Connector
  • Downstream: 2 Male DB9, w/ nuts
  • LEDs: Power, TX / RX

$49.95

(2 customer reviews)

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1 - 4 $49.95
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12 - 24 $47.45
25 - 49 $46.45
50+ $44.96

Also available from:

Model No. USBG-232FT-1

Description

Introduction:

The USBG-232FT-1 USB to Dual Port RS-232 Serial Adapter is designed to be light weight and portable making COM port expansion quick and easy. By connecting to a USB port on your computer or USB hub, the USB Dual Port RS-232 Serial Adapter instantly adds two RS-232 serial communication ports to your system. The USB Dual Serial Adapter adds devices to your system using easy Plug-and-Play features and hot plug features.

 

Plugging the USB Dual Serial Adapter to the USB port, the adapter is automatically detected and installed. There are no IRQ & COM port conflicts, since the ports do not require any additional IRQ, DMA, memory as resources on the system. The USB Dual Port RS-232 Serial Adapter is self-powered.

 

This USB to Dual RS-232 Serial Adapter provides instant connectivity with modems, ISDN TAs, PDS, handheld & pocket PCs, digital cameras, POS, serial printers, etc. It is suitable for remote access, retail and industrial applications, data collection and other applications requiring a High speed and/or LOW speed serial communications port.

Features:

  • Adds two RS-232 serial ports by connecting to a USB port
  • Plugin converter connecting to a USB port conveniently
  • 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
  • Non-standard baud rates supported
  • LED status indicators for TxD and RxD for easy port monitoring and diagnostic
  • Serial port protected with surge 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 98, Me, XP, 2000, 2003, CE, Vista, Windows 7, 8, 10, Windows 11
  • Linux and Mac OS 10.X

Package Contents:

  • MINI USB to 2-port RS232 serial adapter
  • 3ft. USB Extension Cable
  • CD-ROM disc with drivers
  • User’s Manual
Specifications

Product Specifications

Power
External Power Required

No

Mechanical
Color

Blue

Item Dimensions (L × W × H)

3.20 × 1.68 × 0.94 in.

Item Weight

0.094 lbs.

Ports

2 Serial Ports

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

128 bytes

FIFO Transmit

384 bytes

Data Bits

7, 8

Parity

None, Even, Odd, Mark, Space

Stop Bits

1, 2

Flow Control

Hardware (RTS, CTS), XON/XOFF

Serial Ports

2

Software
OS Support

Win 11, Linux, Mac OSX, Win 10, Win 7, Win 8, Win 8.1

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

Other Data
Connector

DB9 Male w/ Nuts

UPC

729440691042

Weight

.35 lbs

Dimensions

5.25 × 5.25 × 1.1 in

UPC: 729440691042
Pin-Outs

DB9 RS-232 Pin-Outs

DB9 RS-232 Pin-Out Diagram
DB9 RS-232 Pin-Out Chart
Optional Accessories

Accessories & Replacement Parts

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

Support
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 (2)

2 reviews for 2-Port USB 2.0 to RS-232 DB-9 Serial Adapter w/ 15kV Surge Protection & 3 ft. USB Extension Cable

  1. Claude Lussier

    Was easy to install and works well – Like your follow up and your customer care

  2. Kirk005

    I needed to access serial devices (for control system design) and this unit works great! always connects and at good speeds. Highly recommended.

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