Wiring a SECU16I

Hopefully someone can direct me to a diagram for this.
I have a SECU16I and I am trying to figure out how to
wire the thing.
I have gotten the power and comm lines working. My question
is where do I connect the input leads from a door sensor? I
assumed that one lead goes to common and the other to one of
Input points. Why are their so many commons? Do input 5-8 connect
to the two common connections above them, or can they go to
any common?

Thanks;
Don
 
You connect the supplied 1K ohm resistor between an input and ANY ground, then the leads to the door sensor to that input and any ground as shown below. All the commons are the same.
 

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