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From NUUO Wiki

Here are two diagrams, dry contact is not supported in the 1st diagram, but is supported in the 2nd diagram.

(A) Please note dry contact is not supported in this diagram.

Digital Input device requires 4.0V at least if you choose this diagram.

• Input logical level 0: +1V (max).

• Input logical level 1: +4.0V ~ +30V.

Digital Output device requires 4.0V at least if you choose this diagram.

(B) In this diagram, the voltage can be provided by C26 itself, the maximum voltages are 30V.

G3-IO

Please note: Dry contact is not supported. Digital input device requires 5V.