Right. I cannot figure out from your description what the HELL components you are talking about. For instance, the motion sensors I'm aware of are dry contacts that can be wired as open until sensing (NO = normally open, or NC = normally closed) or closed until sensing. You'd wire power from a supply through that relay and on to the next thing... which is a contact sensor? What's a contact sensor? Do you mean a URC SEN-CCLS Contact Closure Sensor?

A contact closure sensor would output a voltage, just as yours does. It would sense when this voltage has been shorted by a motion sensor. It might be able to be set up to detect the relay closing, or the relay opening. The normal method would be to have the motion sensor close its dry contacts.

Mario neatly sidestepped the brand and model issue by describing what you should be using but offering no details.