Windows 10: USB Serial Adapter COM Port Changes on Reboot

I have a Windows 10 Laptop with a USB Serial Port Adapter with an attached printer. When I reboot the computer, the COM port assigned to the USB adapter changes randomly so that the printer no longer works. What can I do to ensure that the Serial Port Adapter is always assigned to the same COM port whenever the computer reboots?

:)

 

Changing the Port settings for Serial-USB.

Hi,



Thank you for writing to Microsoft Community Forums.

If you want to change the port settings, please follow the steps mentioned below:

1. Open Device manager (right click on start button
   and then on Device manager).
   
2. Then expand port (COMS & LPT).
   
3. Then right click on Prolific USB-to Serial Comm Port and then on properties.
   
4. Go to port settings and click on Advanced.
   
5. You will be able to make the changes on this screen.
   

Hope this helps.

 

Yellow ! next to Prolific USB-to-Serial Com Port (COM3)

Hi John,



Welcome to Microsoft Community and thank you for posting your query.



Based on your description, the issue seems like HooToo USB port driver is outdated. Let’s try simple steps and check if this help.



I recommend you to update the HooToo USB port driver and check if this helps. Follow the below steps.

• 
  Press Windows key + X and click on
  Device manager.
  
• 
  Click on Universal Serial Bus to expand and right click on the port device and click on
  Update.
  

If the issue still persist, I suggest you to go to the USB manufacturer website and install the driver for Windows 10. If the available USB driver is not for Windows 10, try installing the driver in compatibly mode and check.

HooToo.com | Future Network for Today

• 
  Right-click on the setup file of the driver and select Properties.
  
• 
  Select Compatibility tab.
  
• 
  Check Run this program in Compatibility mode.
  
• 
  Let the driver install and then check the functionality.
  

Hope this helps. If you need further assistance with Windows, let us know and will be glad to help.

 

PROLIFIC USB-TO-SERIAL COMM PORT WINDOWS 10

The final definitive guide for fixing the failure of the (PL2303) Prolific USB-to-Serial Comm Port driver in Windows 10, step by step:

First, install the latest driver for the PL2303 USB-to-Serial adapter from Prolific's website; then

Download older driver that is compatible with Windows 10:

1. Download the core driver files (.cab .sys .inf) for version 3.3.2.102 (32bit and 64bit files):

Profilic_Win8_x64_x86.zip (87.12KB) - SendSpace.com

2. Uncompress into a directory.

Install older driver to fix error/failure:

1. Open Device Manager and right click on the failed Prolific USB-to-Serial Comm Port device;

2. Select "Update Driver software ...";

3. Select "Browse my computer for driver software";

4. Select "Let me pick from a list of device drivers on my computer" (other driver versions visible here);

5. Select "Have Disk ...", and then browse or paste the path to the "Prolific_Win8_x64_x86" directory;

6. Click Next to install;

7. Close.

Stop Windows from loading the latest driver and overwriting the fix:

1. Open "Device Manager";

2. Locate the adapter and check if the Exclamation mark is showing for the Code 10 error;

If the error doesn't show, remove and re-insert the adapter from the USB port until it does (this will load the latest version);

3. Right-Click on the failed device and Select "Uninstall";

4. Complete the uninstall process (delete installed files!) and remove and re-insert the adapter from the USB port. This will remove the latest version driver files but leave the compatible version in place;

5. Done! The failed driver will not load.

Please let me know if the steps here need modification due to error or changes in the OS. This worked for the Anniversary version of Windows 10. Cheers!

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