Clear the computer occupies the serial port

Generally when using a USB to serial port, add a driver, the computer assigns a port number to the device, and records in the registry, so that the device also occupies this port. How to clear it?

Enter "regedit" in the "Run" dialog box to enter the registry;

Then enter hkey_local_machine\system\currentcontrolset\control\com Name Arbiter and we can find the value entry: Comdb, whose value represents the serial port number currently in use.

For example, 1d, it's binary: 0001 1101, then the right-to-left number represents the 1,3,4,5 port is occupied. So we just have to delete the Comdb data item and close the registry (without restarting the computer).

Clear the computer occupies the serial port