All electrical and electronic manufacturers designate "normally open" as the device state when the relay, switch, etc is in its resting state with no signal applied. Therefore, if no magnet is applied to a reed switch, the contacts are not closed and the switch is "normally open". However, my Ademco manual talks about normally open circuits vs. normally closed circuits. Is "normal" in alarm language considered to be with all windows and doors closed with no alarm condition? Or is the normal state considered to be when the windows are open, no magnet applied, contact open? The book does not make a distinction between the definitions as related to devices vs. circuits and their explanation is somewhat ambiguous. I suppose I could program it both ways and see which one works, but it would be easier to do it right the first time.
Bob