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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.
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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 |
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Italic |
Information that the user must supply |
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Bold |
Elements that the user must type exactly as shown |
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Ellipsis (...) |
Parameter that can be repeated several times in a command line |
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Between brackets ([]) |
Optional items |
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Between braces ({}); choices separated by pipe (|). Example: {even|odd} |
Set of choices from which the user must choose only one |
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Code or program output |
