In Windows 11, while I am using macro based Excel for serial port communication, I am unable to serial port.open

Question

On Windows 11, I cannot access serial port with macro-based Excel to send a command to the serial port. But the same Excel is working fine on Windows 10. Please suggest a solution.

Example: the command shown here is unable to open the serial port for communication in VBA:

Open "COM" & port & ":19200,N,8,1" For Binary Access Read Write As #1   'Opens Com Port with Baud rate and bit settings

The above command is working fine on Windows 10 - I am expecting same thing with Windows 11.

What error message do you get? Does the Win 11 machine even have a serial port? What version(s) of Excel are running on each platform? — Martin Brown
– Martin Brown, Commented Apr 18 at 12:55

JC Coetzee · Accepted Answer · 2025-05-05 07:50:31Z

1

So if it is the case of VBA Excel not opening port, the fix i got is to only use "COM1" and not with the extra bitrate and and and..

Open "COM4:115200,N,8,1" For Binary Access Read Write As #1

Open "COM4" For Binary Access Read Write As #1

answered May 5 at 7:50

JC Coetzee

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