Anritsu 0701012 - Manual (Page 62)

Method 3–Remapping a Serial Port Serial Port Compatibility
C-6 MA24106A UG
9. You will get an alert when you close the window telling you that the COM port number may be in use by
another device and asking if you want to continue. Click Yes to continue.
10. Close all windows that you have opened up to this point.
Figure C-5. Device Manager