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How to Fix Excel VBA Serial Port Access Issues on Windows 11
Question details
An Excel VBA macro designed to communicate with a COM serial port works perfectly on Windows 10 but fails to execute successfully after the system is upgraded to Windows 11.
- Product
- Microsoft Excel
- Device & OS
- Windows 11
- Scenario
- Using a VBA macro to open COM6 at 19200 baud, send a command string ('VER' followed by a carriage return), and read the hardware response into a worksheet cell.
- Observed behavior
- The VBA script cannot establish communication with the serial port on Windows 11, resulting in an error or failure to populate cell C2 with the expected response.
Verify that your serial device is properly connected and recognized in the Windows 11 Device Manager, and ensure no other applications are currently occupying COM6.
Consult the Developer Community on Stack Overflow
Since this issue often relates to OS-level API changes in Windows 11, posting your specific hardware parameters to Stack Overflow is the most effective way to get updated VBA code.
VBA serial communication relies heavily on Windows APIs. Moving from Windows 10 to Windows 11 may require updated driver configurations or 64-bit API declarations.
Open your browser, go to Stack Overflow, and click the 'Ask a Question' button.
Add the 'VBA' and 'serial-port' tags to your question to ensure it reaches developers with the right expertise.
Include the exact COM port configuration in your post: mention you are opening 'COM6 at 19200 baud' and sending the 'VER' command with a carriage return.
Paste the VBA code that worked on Windows 10, state the specific error message received on Windows 11, and explain that the response should populate cell C2.
Verify Windows 11 Device Manager Settings
Ensure that Windows 11 has correctly assigned the COM port and installed the appropriate drivers for your serial device after the upgrade.
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Frequently Asked Questions
Why did my VBA serial port code stop working after upgrading to Windows 11?
Windows 11 may handle hardware drivers and legacy API calls differently than Windows 10. You might need to update 32-bit API declarations to 64-bit (using PtrSafe) or install updated Windows 11 drivers for your serial adapter.
How can I check which COM port my device is using in Windows 11?
Open the Device Manager by right-clicking the Start menu, then expand the 'Ports (COM & LPT)' section. Your connected serial device will be listed here along with its assigned COM port number.
Can I use MSCOMM32.OCX in Windows 11 for VBA serial communication?
MSCOMM32.OCX is an older 32-bit ActiveX control that is often not supported or registered by default in modern 64-bit environments like Windows 11. It is recommended to use native Windows API calls instead.
