Ok so anyone who wanted understanding of How to connect a DAB to open sprinkler. Its simple, after speaking with DAB , the pump regulates pressure in the line as the solenoids are opened by open sprinkler controller than pushes water to the desired zone. Once the zone solenoid turns off the water pressure in the line signals the pump to turn off. There is a delay of 10 sec which is standard from the manufacture and can be adjusted down to 2 seconds for the pump to turn back on and to fill another desired zone.
Thank you for all.