Has 5 cable connections, one for the power unit and two pairs for each derailleur one for the bar end shifter and one for the bar end brake lever.
Along with the Power Unit the interface represents the thinking centre of the electronic EPS system, DTI (Digital Tech™ Intelligence) . Its main functions are:
Turning on the rgb led in different colours to communicate with the user
Manage the setting procedure
Receive impulses from the controls and translate them into digital signals that are transferred to the Power Unit
Maintain a dialogue with the power unit and thereby process the information