UTC Fire & Security B.V. AA2 用户手册

If the sensor is activated but the door is not opened, the relay will 
drop out after ten seconds. If the sensor is activated and the door 
is opened, then closed, the relay will drop out after two seconds. 
This prevents unauthorized people from entering (Figure 8).

Many fire codes require a panic button to be part of the installa-
tion. The RCR-REX has an X (external) input (see 

) for a normally open panic button or an internal timer 

panic button. When X input is grounded, the door will open. Two 
normally open devices may be connected to the X input 
(Figure 9).

Connect the monitor relay terminals across the normally closed 
contacts (NC) of the door switch and across the access control 
system. If there is no access control system, connect the normally 
closed contacts of the door switch across the monitor relay terminals.

This pin is used to enable and disable the unit with an external 
signal. The unit will be disabled when R is grounded for more 
than 10 seconds. Thereafter, when R is ungrounded, the unit will 
be enabled. Motion detected by the unit up to 10 seconds after R 
is grounded and at least 100 milliseconds after R is ungrounded 
will start the relay timer.
This pin must be switched with a dry contact or an open collector 
transistor referenced to COM (ground).

This pin allows external control of the sounder that takes prece-
dence over all other sounder modes. If the unit is powered up 
with S ungrounded, then the unit assumes that S is unused.
Whenever S is grounded after power up, the unit assumes that S 
is being used to externally activate the sounder. Thereafter, when 
S is ungrounded for at least 100 milliseconds, the sounder will 
unconditionally turn on and stay on until S is grounded. 
This pin must be switched with a dry contact or an open collector 
transistor referenced to COM (ground).

This pin can be used by card readers, keypads, remote push 
buttons, and key locks to cause the sensor to start a timing cycle.
If X is pulled to ground for at least 500 milliseconds and less than 
3 seconds, the lock/monitor relay will unlock the door and the 
lock timer will start as if a person walked into the detection area. 
If X is grounded for more than 3 seconds, then the relay will stay 
in the unlocked state until X is allowed to go high. When X goes 
high and if the door is still open, the sounder will produce a 
beeping tone and the relay will remain in the unlocked state until 
the door closes. When the door closes, the relay will lock the 
door and shunt the door switch.
This pin must be switched with a dry contact or an open collector 
transistor referenced to COM (ground).

This pin is used to detect the state of the door switch. The door 
switch must be connected between pins D and COM (ground). If 
the unit is powered up with D ungrounded, the unit assumes that 
D is unused. If D is ever grounded after the unit is powered up, 
the unit assumes that D is being used to sense door position and 
the sounder will beep (if enabled) when the door is left open.
If used, this pin must be switched with a dry contact or an open 
collector transistor referenced to COM (ground). See 

These two pins connect to the tamper switch, which opens when 
the housing cover is opened.

These two pins are connected to ground and serve as the ground 
reference when using pins R, S, X, and D.