
REX Button
22 AC-B/C/D3x Family Installation and Programming Manual
7. REX Button
The REX button is used to open the door without the use of a PIN
code, and must be located inside the premises to be secured. It is
usually located in a convenient location, such as inside the door or at
a receptionist's desk. The function of the REX button depends on
whether the Lock Strike Relay is programmed for Fail Safe Operation
or for Fail Secure Operation. The door chime in the BL-D40 does not
sound when the REX button is used to open the door.
Fail Secure Operation: From the moment the REX button is
pressed, the door remains unlocked until the Lock Strike Release
Time passes. After this time, the door is locked even if the REX
Button is not released.
Fail Safe Operation: From the moment the REX Button is pressed,
the door remains unlocked until the REX Button is released and
the Lock Strike Release Time passes. In this case, the Lock Strike
Relay only begins its countdown once the REX Button is released.
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