Re: Normally Open vs Normally Closed - does it matter?
...could I move a wire or something on the Garage Door sensor to make it a normally open sensor?
The terms normally-open (NO) and normally-closed (NC) refer to the state of the switch contacts in a relay/magnetic switch, etc when it is in the normal (i.e. not operated) condition. So, with a magnetic sensor, when it is not near the magnet (the "normal" case) a set of NO contacts would be open (not in contact). Then, when the switch came near the magnet the switch would close.
It is very common for relays, etc. to offer both NO and NC contacts. This lets you choose the way you wish the output to appear. This diagram of a NO magnetic switch provides a good illustration. Since it is being operated by the magnet, the NC lead is connected to the common. But, when the magnet is moved away, the NO contact will once again be connected to the common:
In your case, you would probably want to use the NO contacts of your garage door sensor. That way the I/O-Linc would report open
when the door was in fact open and closed
when the door was closed.
Hope this helps.