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In the Interface Editor you can set the orientation of a ports. In the Editor this orientation can be made visible by setting the Orientation Info command from the View menu. Depending on the type of port the orientation has a different meaning.

Signals: For signals the orientation indicates the direction of the associated variable : input or output.
Bond Graphs: The orientation of a bond graph port is the direction of the half arrow at the end of a bond. It indicates the direction of the positive power flow.
Iconic Diagrams: The orientation of an iconic diagram port also indicates the direction of the positive power flow.

If you select the top of the list in the Interface Editor, you can choose the Port Relations tab to set multiple port relations:

Equal / Not equal: The equal and not equal restrictions can be used to specify that a port p1 must have the same or opposite orientation as port p2.