When an external ECU interface is connected to a DASH2, the data from the interface can be displayed on the screen or used to set up alarms. This screen enables the selection of which data comes from the interface and which doesn't. Select the ECU Interface option from the main screen, then use the drop down menu to select the correct ECU interface:
The full list of available ECU interfaces can be found here.
When an ECU has been selected, the required channels and units for those channels can be enabled by ticking the boxes on the left hand side of the screen.