In some cases, user cannot be able to open serial port because of driver error or physical damage. To fix this problem, you should reinstall or update drivers. For more assistance, you should go to office.com/myaccount.
Method to Fix If Unable to Open Serial Port:
1. Ensure you have Necessary Drivers:
The customer should first right-hit on the Start menu and then chooses Device Manager. After this, you need to expand the option of Universal Serial Bus controller category. Now, you should right-tap on the driver and then select Update driver. In the end, the user should tap on the option of Search automatically for drivers.
2. Check the Port isn’t open/disconnect the Cable:
Sometimes, the customer faces the issue of Unable to open serial port message, in case the port is open already. To resolve this issue, users should disconnect the cable from the other device and then again try to connect it.
3. Stop Windows Fax and Scan service:
To stop Window Fax and scan service, you need to hit on Win + R keys in the keyboard just to open the Run dialog. After this, you need to input services.msc and then hit on Enter or OK option. If the Services window opens up on your screen, then find the Windows Fax and Scan service and just double-hit on it in order to open its properties. At this point, you need to set the Startup type to Manual and then tap on the Stop button in order to stop the service. At last, you need to hit on Apply and OK button to save changes.
4. Disable Serial Port in Device Manager:
To disable serial port, you should hold Windows Key + X together and then from the list, you should select Device Manager. If the Device Manager opens up on your screen, then find the serial port and just right-tap on it. Here, from the menu you need to select Disable device. If the confirmation dialog displays on your screen, then tap on Yes button. At the end, you should wait for few minutes and then you need to turn on the serial port.
5. Use Different Cable:
Sometimes, the customer gets this error message when the USB cable isn’t working. So, you should check if your cable is properly connected. Also, you should check the visible damage. In case, your cable seems in order, then just try to replace it and then check the problem.
6. Restart Device:
The user can resolve this issue by restarting the devices. When you are trying to connect, then you should Restart the device and then check if this fixes the problem. Or, the user can restart the PC and then check if that solves the error.
7. Reinstall Serial Port Driver:
To reinstall, you should first open Device Manager. After this, you should find the serial port and then right-tap on it, and then select Uninstall device. Now, you need to hit on Uninstall button to confirm. When your device is uninstalled, then just restart your PC.
8. Ensure System is Up to Date:
First, you need to open the Settings app and then navigate to the Update & Security section. After this, in the right side of the screen you should tap on Check for updates button. In case, you find any updates then it will automatically download in the background and get installed in your device when you Restart the computer.
With this method, you can fix the issue if Unable to open serial port. If the customer needs more details, then go to office.com/myaccount.