This command sets the global Emergency Management Services settings for the system. Emssettings does not enable or disable ...

This command sets the global Emergency Management Services settings for the
system. Emssettings does not enable or disable Emergency Management Services
for any particular boot entry.

bcdedit /emssettings [ BIOS ] | [ EMSPORT: | [EMSBAUDRATE:] ]

    BIOS        Specifies that the system will use BIOS settings for the
                Emergency Management Services configuration. This works only
                on systems that have Emergency Management Services support
                provided by the BIOS.

          Specifies the serial port to use as the Emergency Management
                Services port. This should not be specified with the BIOS
                option.

      Specifies the serial baud rate to use for Emergency Management
                Services. This command should not be specified with the BIOS
                option.  is optional, and the default is 9,600 baud.

Examples:

The following command sets the Emergency Management Services parameters to use
BIOS settings:

    bcdedit /emssettings BIOS

The following command sets the Emergency Management Services parameters to use
com2: at 115,200 baud.

    bcdedit /emssettings EMSPORT:2 EMSBAUDRATE:115200