Parallel and serial ports are interfaces for connecting peripherals to the virtual machine. The virtual serial port can connect to a physical serial port or to a file on the host computer. You can also use it to establish a direct connection between two virtual machines or a connection between a virtual machine and an application on the host computer. You can add parallel and serial ports and change the parallel and serial port configuration. Hardware version 11 and later versions allow you to configure virtual machines in such a way that serial and parallel ports are absent from the virtual chipset altogether.
Using Serial Ports with vSphere Virtual Machines Adding a Firewall Rule Set for Serial Port Network Connections Configure Virtual Machine Communication Interface Firewall Change the Serial Port Configuration Authentication Parameters for Virtual Serial Port Network Connections Add a Serial Port to a Virtual Machine in the vSphere Web Client Change the Parallel Port Configuration Add a Parallel Port to a Virtual Machine vSphere Web Client
