A source device and terminal pair generates the synchronization signal and is connected to the destination device and terminal pairs. You must physically connect the source and destination terminals, unless they are internally connected. Check your device specifications for more information. Synchronization connections are added from the source device to one or more destination devices.
The source device provides the trigger or clock signals.
The destination device receives a trigger or clock signal.
For example, if you determine that a terminal on Dev1 will provide a trigger and a terminal on Dev2 will receive that signal, then Dev1 becomes your source device and Dev2 your destination device. You can have multiple destinations for your trigger and clock connections, but only one source.