Checking the Log file box enables serial port logging.  Data appearing on the serial port will also be written to an ASCII log file.  By default, the log file name is <base>_VirtualAlphaName_serial#.log.

VirtualAlphaName:  The name of the virtual Alpha definition as it appears on the definition tab.

serial#:  serial0 or serial1, depending upon the serial port being logged.

Note:Caution should be used when logging serial port activity.  A heavily used port will produce a large log file, which may impact disk resources on the host system.