NX-8V2 Alarm. Setup Keyswitch with Relay

I would really appreciate any help that you could provide me with setting up the relay to act as a 'key switch'

I am trying to understand if ...

Should the really be Normally  Open or Normally Closed ?

Do you keep the realay open or closed for the period you want it alarmed or should it be used as a momentary switch ?

Is a resistor needed in the wiring, what value and series or parallel ?

Thanks 


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