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What is the difference between normally open and normally closed?
In a push button type switch (RX or LX), in which the contacts remain in one state unless actuated, the contacts can either be normally open (abbreviated "n.o." or "no") until closed by operation of the switch, or normally closed ("n.c. or "nc") and opened by the switch action. Current locksets that offer an RX or LX switch can operate in either state, but the product you are tying them into usually dictates which type of state is required.
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