The virtual COM port will not be accessible even after the virtual serial device is reconnected unless the virtual COM port is released by the application prior to the reconnection, which may require closing the application first. The virtual COM port will be removed from the device manager when the USB cable is unplugged, even if an application has the virtual COM port open. However, there is a known Windows issue that affects most applications.
Note that, if you unplug the USB device and plug it back in later, Windows will still remember the COM port assignment, so you won't need to go through this procedure again. Now close the System Properties window.Īt this point, you are ready to use the virtual COM port in any application! If you want to confirm the port change has indeed been made, click on Device Manager again and check the listed Ports. Click OK and then OK to the port settings. Click OK, and if Windows warns you about a duplicate, ignore the warning and click Yes.
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