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It is recommend to use potential-free relay contacts as triggers. Connect these to 12V and to one of the Switch Inputs S1-S8.
If you are using triggers with their own voltage supply (11-13 V) connect – to Ground and the gate input to one of the Switch Inputs S1-S8.
Note that the contacts should not be switched faster than twice per second to be recognized correctly. 4 times (4 Hz) could be reached under circumstances, but maximal 2Hz is recommended.

Please make sure that you are using the same grounding in order not to get any potential equalization!