Windows 10: Com port transmission stopping in windows 10

Hi, I hope someone here can help me.I work for a company that uses a RS485 to transfer a program to a circuit board.We have found since swapping most of our machines to Windows 10 that we can no longer transmit these programs.I have installed a port sniffing tool and found that when the program sends an exclamation mark ! the port will stop transmitting.This problem is not found in windows 8.1 or earlier. We have also found that if we run the software inside a virtual PC the port still works, so its not a hardware issue.I have also tried a Windows 11 machine and found the same problem exist

:)

 

Windows 10 Tweaks

Pressing “Windows+Pause Break” (it’s up there next to scroll lock) opens the “System” Window.

Windows 10: In the new version of Windows, Explorer has a section called Quick Access. This includes your frequent folders and recent files. Explorer defaults to opening this page when you open a new window. If you’d rather open the usual This PC, with links to your drives and library folders, follow these steps:

• Open a new Explorer window.
• Click View in the ribbon.
• Click Options.
• Under General, next to “Open File Explorer to:” choose “This PC.”
• Click OK

credit to Lifehacker.

 

Windows 10 lost COM ports

Hi John,

The issue that you’ve encountered regarding the missing ports on your Windows 10 computer may be caused by some configuration or files mismatched. To sort out your concern, we’d like to know the following information:

• What are the troubleshooting steps you've done so far?
• Which devices are using the COM port on your computer?

Additionally, we suggest that you follow the steps provided in this article on how to perform the
Advanced startup options (including safe mode).
Once you’re on the page, you may proceed with the steps and complete the process. After completing the steps, you may check if you’re able to install the port on your PC properly.

We’re looking forward to your response.

 

USB port stopped working

I had a USB2 port on the front panel that was working for a year but then one day it was not.

I uninstalled / installed the device via Control Panel for both of the USB Composite Device listings but it made no difference. I thought it may be a bad connection but everything looked OK. Both ports had power according to a USB digital voltmeter.

On the motherboard I moved the cable going to the front panel from one of the USB 2.0 Headers to the other Header & everything worked. At least for a couple months. Now the same port on the front panel does not work again.

So I uninstalled / installed both USB Composite Device listings but it made no difference. Under Properties it says they are working properly.

In Control Panel I did not touch the USB controllers for either USB 3.0 listing or for the USB Printing Support.

The port was working a few days ago but now it is not. The only thing that really happened lately was a Windows 10 Security Update that was installed on 10-27-2022. Could that have changed something?

Anything is possible but it seems strange that the same front panel port stopped working no matter which mobo header is used. Could one of my USB thumb drives be going bad & when plugged in is shorting out something on the motherboard?

Any ideas & suggestions would be greatly appreciated.
Thanks