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change port

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Applies to: Windows Server 2022, Windows Server 2019, Windows Server 2016, Windows Server 2012 R2, Windows Server 2012

Lists or changes the COM port mappings to be compatible with MS-DOS applications.

Note

To find out what's new in the latest version, see What's New in Remote Desktop Services in Windows Server.

Syntax

change port [<portX>=<portY>| /d <portX> | /query]

Parameters

Parameter Description
<portX>=<portY> Maps COM <portX> to <portY>
/d <portX> Deletes the mapping for COM <portX>
/query Displays the current port mappings.
/? Displays help at the command prompt.

Remarks

  • Most MS-DOS applications support only COM1 through COM4 serial ports. The change port command maps a serial port to a different port number, allowing apps that don't support high-numbered COM ports to access the serial port. Remapping works only for the current session and is not retained if you log off from a session and then log on again.

  • Use change port without any parameters to display the available COM ports and their current mappings.

Examples

  • To map COM12 to COM1 for use by an MS-DOS-based application, type:

    change port com12=com1

  • To display the current port mappings, type:

    change port /query