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Change port

Updated: January 21, 2005

Applies To: Windows Server 2003, Windows Server 2003 R2, Windows Server 2003 with SP1, Windows Server 2003 with SP2

Change port

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

Syntax

change port[{PortX=PortY | /dPortX | /query}]

Parameters
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 applications that do not 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

Formatting legend

 

Format Meaning

Italic

Information that the user must supply

Bold

Elements that the user must type exactly as shown

Ellipsis (...)

Parameter that can be repeated several times in a command line

Between brackets ([])

Optional items

Between braces ({}); choices separated by pipe (|). Example: {even|odd}

Set of choices from which the user must choose only one

Courier font

Code or program output

See Also

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