MED-V 1.0: How to Use Serial Ports with MED-V
You will also need to set the appropriate COM port settings in the base .VMC file. You can do this through the user interface by editing the settings of the virtual machine.
You can also modify the VMC directly. The XML for the .VMC pertaining to the serial port is below. The below XML represents COM1 enabled for serial port usage:
<serial_port id="0"> <connect_immediately type="boolean">true</connect_immediately> <port_name type="string">COM1</port_name> <port_type type="integer">1</port_type> </serial_port>
You may also need to ensure the settings are verified on the guest OS as well (inside Device Manager within the guest operating system.)