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Unless your custom software can set the comport in advance before communicating.

If mode status not match with the device manager setting especially the bauds rate, then device not function. if it didn't show up or not show the right speed as for printer will print funny letters, etc.

The real 9/25 pins serial port will not show in the mode status, only those USB2serial will be, if got the right setting. Mode status (run cmd, mode) if the setting show or none in the mode status Or put the usb/com device into all usb port one by one, set same setting, so plug into any usb portĪdvance port setting in hardware device manager for usb will not same as Tag the usb port for the usb/com device or visa versa.