In Coupled Models two types of ports can be created: Input Ports and Output Ports. They are characterized by their graphics.

In this case Port0 is an input port and Port1 is an output port.

All ports have an identificatory name. In this Case, Port0 and Port1.

This name can be changed either from the port contextual menu at the Modelling Panel or from the Units Tree. Another option is to double click on the Units Tree. The Cd++ Modeler opens the following window to select the port identifier.

From the contextual menu, an image for the ports can also be selected.

Selected image replaces default por image.