RS232/422/485 to USB 2.0 Serial Adapter Combo

Serial to USB Multi-Protocol Adapter

This 2-Port serial adapter supports the use of one or two serial protocols simultaneously making it very versatile for many COM applications.

  • Option to make use of one, or two Serial Protocols simultaneously.
  • DIP Switch control for RS-232, RS422, or RS485 signal usage.
  • LED status indicators for RX/TX and which protocol used.
  • Mountable to any flat surface for application stability.


Not in stock - Backorder allowed

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Units Price
1 - 4 $98.95
5 - 11 $95.98
12 - 24 $94.00
25 - 49 $92.02
50+ $89.06

Model No. CG-232485CBO

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2-Port Serial to USB 2.0 Adapter

The CG-232485CBO is a rugged two port RS232/422/485 serial to USB 2.0 adapter supporting high-speed connectivity. It supports the combination of the serial ports signal by use of DIP switch controls giving this serial adapter the versatility to use one or two serial signals simultaneously.

CG-232485CBO DIP Switch Control

This serial adapter to USB 2.0 combo includes LED status indicators for RX/TX for each serial port and also includes LED signal monitoring for a visual distinction between which type of signal is in use on each port i.e. RS232, RS422, or RS485. The CG-232485CBO also supports screw lock design for both the USB 2.0 Type-B port and the DB9 serial ports for secure connections all around.

CG-232485CBO DB9 Serial Ports

This serial adapter is mountable via its integrated flange on the industrial-grade case and can mount to any flat surface to support its application use. The combo adapter is packaged with a 6ft USB 2.0 Type-A Male to Type-B Male cable that incorporates a screw lock mechanism on both ends

Serial Adapter Combo Features

  • Provides 2 RS232/422/485 Serial Ports over USB Port
  • Support Hot-Plug functionality
  • Provides 2 DSUB-9 Connectors
  • Supports USB2.0 High Speed (480Mbps) Data Rate
  • Supports USB Screw Lock Mechanism Enhances Reliability
  • Baud Rate from 300 bps to 921.6Kbps
  • Supports 7,8 Data Bits
  • Odd, Even, Mark, Space, or None parity mode
  • Supports 1, or 2 Stop Bits
  • Supports USB Bus Power
  • Optional Model Supports 2,500Vrms Isolation and 15KV ESD Protection
  • Supports Windows 10, 8, 7, Vista, 2003, XP, Win2000, Linux, and Mac OSX


101.6mm(L) x 87.299mm(W) x 23.812(H)
112.712mm(L) x 87.299mm(W) x 23.812(H) with mounting flange

Environmental Information

  • Operating Temperature 0 to 55 °C (32 to 131 °F)
  • Operating Humidity 5 to 95% RH
  • Storage Temperature -20 to 75 °C (-4 to 167 °F)

OS Support:

  • Windows 10, 8, 7, Vista, 2003, XP, Win2000
  • Linux and Mac OS 10.X

Package Contents:

  • CG-232485CBO combo adapter
  • 6ft. USB 2.0 Type-A to Type-B Cable
  • User Manual (also downloadable from this page)
  • Drivers Disk

*Surface Mounting screws not included.


Product Specifications

Country of Origin






Mounting Style

Surface Mount


1 USB Port

USB Type

USB 2.0

Screw Lock Compatible


Serial Attributes
Serial Standards

RS232, RS422, RS485

OS Support

Win-2000, Linux, Mac OSX, Win 10, Win 7, Win 8, Win Vista, Win XP

Operating Temperature

0C to 55C



Other Data



1.002 lbs


9.00 × 6.250 × 1.687 in

UPC: 736983902108
Optional Accessories

Optional Accessories

The RS232/422/485 to USB 2.0 Serial Adapter has certain accessories that work with it. These accessories are what you can order if needed.

USB 2.0 Cable for close connections Use this USB 2.0 cable to connect your desktop or laptop using a USB hub, printer, or scanner. Transfer…

Model# USB2-AB


In stock

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Product Documentation & Drivers

Need drawings, CAD files, or other compliance documentation? Click HERE

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.
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