Change port

This page is from Microsoft

Updated: January 21, 2005

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.

/dPortX

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

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