4-Port USB DB-9 Serial Adapter Solution

1. 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.

1. 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.

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.

• 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.

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.