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June 13, 2017 at 2:00 am #46714
The setup guide explains the wiring: COM (common) wire goes to the COM terminal (either of the two).
For example, if you have 6 valves, the common wire goes to COM terminal, and each individual zone wire goes to a zone port (say zones 1 to 6 ports).
VIN outputs +5V, and that’s used for sensors that require +5V power. It’s not for valves.