Yes, commonly with a Ruida they are pulled down, requiring an NPN type sensor.
You may be right… I get your point, electrically speaking.
I’ve never seen the actual input schematic of the Ruida or any other piece.
Could you please explain the purpose of the items marked in red in post 3?
Maybe I’m reading too much into their manual 
If @resh already has them installed, It would be a fast, easy check and may save him time and money if it works properly.
