Switching COM Ports using script or Powershell or command line

AKR2021 1 Reputation point
2021-08-17T16:24:20.807+00:00

Hello,

I am working on OEM. I use a windows image to install the devices. When the device is newly installed , the COM ports are shifted to 9-16 rather than 1-8 and it shows as comports 1-8 are in use. Is there a possibility to write a script to change the COM Port numbers. I was changing them manually till now but manual changes is not an option any more.

Thank you

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  1. Castorix31 81,831 Reputation points
    2021-08-18T10:57:54.033+00:00

    It can be done in C++, but it is complex, because there are several steps :
    DefineDosDevice
    Writing to
    HKEY_LOCAL_MACHINE\HARDWARE\DEVICEMAP\SERIALCOMM with RegSetValueEx
    ComDBReleasePort
    ComDBClaimPort
    SetupDiSetDeviceRegistryProperty with SPDRP_FRIENDLYNAME
    SetupDiSetDeviceInstallParams with DI_PROPERTIES_CHANGE

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