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Unable to configure serial port Error for USB CDC

Question asked by Stephen on Mar 8, 2016
Latest reply on Mar 11, 2016 by Chinzei.Tsuneo

The target is a custom board based on the STM32F373VC. The project was created by STM32CubeMX with the USB Communications Device Class option enabled.

Windows 7's Device Manager shows the connection is working. This is evidenced by “STMicroelectronics Virtual COM Port (COM9)” appearing under “Ports (COM & LPT)”. When Properties is opened on this line the message “This device is working properly.” appears in the General tab's Device status field.

When I attempt to open a terminal emulator session with KiTTY (fork of PuTTY), KiTTY opens a pop up window with the error message:

Unable to open connection to
COM9
Unable to configure serial port.


I did not know what to enter in KiTTY for a baud rate, number of bits, parity, and stop bits, so I left these port settings at default.

Why is Window's 7 unable to configure the serial port?

What should the terminal emulator's port settings be?

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