RX swith, what is normaly open

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Falcon began offering an RX switch with its electrified functions beginning January 17th 2012.  To specify, add "RX" to the end of the part number. Example:  Storeroom Function, Fail Safe (EL), 12...
The MA RX features independent switches within the chassis that allow the customer to choose whether to monitor the inside or outside knob/lever.
Each switch is pre-wired to work with either normally open or normally closed systems, with color coded 5 ft long leads.
See Marketing announcement here
For the older 17/18 or current 19 device per instructions :  Red - Normally Open  Green - Common   Black - Normally Closed
For 24/25 devices per instructions :   Violet - Normally Open   Black - Common   Gray - Normally Closed
RX wiring on all L9000 locks with RX switch manufactured after January 2, 2017:The L-Series switched to a handed modular three-wire request to exit (RX) switch. This change was originally completed...
Specific to the RX switch installed into the L9080EL/EU and L9082EL/EU and L9000 mechanical locks prior to January 2, 2017:ALL PART NUMBERS BELOW DISCONTINUEDThe L-Series switched to a three-wire r...
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 o...