MATLAB Language Using serial ports Closing a serial port even if lost, deleted or overwritten
Example
Assuming you created the serial port object s as in this example, then to close it
fclose(s)
However, sometimes you can accidentally lose the port (e.g. clear, overwrite, change scope, etc...), and fclose(s) will no longer work. The solution is easy
fclose(instrfindall)
More info at instrfindall().
