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.
/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 |