Note
Access to this page requires authorization. You can try signing in or changing directories.
Access to this page requires authorization. You can try changing directories.
Emergency Management Services (EMS) technology allows you to control the selected components remotely, even when a the PC is not connected to the network or to other standard remote-administration tools.
Enabling EMS on a Computer with an SPCR Table
To enable EMS on a computer with ACPI BIOS firmware and an ACPI SPCR table, you can use the BCDEdit /emssettings and specify either the BIOS parameter or the emsport and emsbaudrate parameters. To enable EMS for a boot entry, use the BCDEdit /ems command.
The following example demonstrates how to use the BIOS parameter. The following BCDEdit command enables EMS console redirection on the current boot entry.
bcdedit /emssettings bios
bcdedit /ems on
For more information on the contents of the ACPI SPCR table, see Serial Port Console Redirection Table (SPCR).
Enabling EMS on a Computer with UEFI Firmware
To enable EMS on a computer with UEFI firmware, use the BCDEdit /ems command and specify a boot entry. Windows finds the out-of-band port and its settings in the firmware by reading the SPCR table and uses the same port and rate for EMS console redirection. The following command enables EMS console redirection on the the current boot entry.
bcdedit /ems {current} on
The following command enables EMS console redirection on the specified boot entry that has the identifier of {18b123cd-2bf6-11db-bfae-00e018e2b8db}.
bcdedit /ems {18b123cd-2bf6-11db-bfae-00e018e2b8db} on
Enabling EMS on a Computer without an ACPI SPCR Table
To enable EMS console redirection on a computer that has BIOS firmware, but does not have an ACPI Serial Port Console Redirection (SPCR) table, use the BCDEdit /emssettings command to set the COM port and baud rate.
These parameters set the global port and transmission rate for EMS console redirection. Use the same port and transmission rate that are established for out-of-band communication in the BIOS.
Then, use the BCDEdit /ems command to enable EMS for a boot entry.
The following commands set the global EMS redirection settings to use COM2 and a baud rate of 115200, and enable EMS for the specified boot entry.
bcdedit /emssettings EMSPORT:2 EMSBAUDRATE:115200
bcdedit /ems {current} on
Changing EMS Settings
When you configure EMS on a boot entry on a computer that has ACPI BIOS firmware and an ACPI SPCR table, you can use the BCDEdit /emssettings command and specify either the BIOS option or the emsport and emsbaudrate options. If you use the BIOS option, do not set the emsport or emsbaudrate options.
When you configure EMS on a computer that has EFI firmware, or with ACPI BIOS firmware and without an ACPI SPCR table, you can use the BCDEdit /emssettings command and specify the emsport and emsbaudrate options.
The emsport and emsbaudrate options set the serial port and transmission rate for EMS console redirection. These settings apply to all boot entries on the computer. To use emsbaudrate, you must also set the emsport option. By default, the transmission rate is set to 9600 (9,600 Kbps).
For example, the following command changes the EMS port to COM2 and changes the baud to 57,600 Kbps.
bcdedit /emssettings EMSPORT:2 EMSBAUDRATE:57600
To enable or disable EMS on a boot entry, use the BCDEdit /ems command.
For example, the following command enables EMS on a specific boot entry that has an identifier of {173075c9-2cb2-11dc-b426-001558c41f5c}.
bcdedit /ems {173075c9-2cb2-11dc-b426-001558c41f5c} on
To disable EMS on the current boot entry, use the following command.
bcdedit /ems off
Note
Each boot entry uses a GUID as an identifier. If you do not specify an identifier, the BCDEdit command modifies the current operating system boot entry. If a boot entry is specified, the GUID associated with the boot entry must be enclosed in braces { }. To view the GUID identifiers for all the active boot entries, use the bcdedit /enum command.