PN# 500-16900
Page 15
Rev. D, 12/11
don’t violate egress building codes when employing a keypad on the inside of a door.
Check with your local building or fire department.
7.2 HARDWIRED CODE DISABLING
This means making a switch connection to the CPU board which will cause valid codes to not be
accepted. The DK-26 has two terminals marked “HCD” and “UCD” which will respectively
disable the Hard code and all User codes. Simply connect the SRC terminal to either of
these terminals via an external switch and the respective codes will not function while the switch
is closed. Alternately if you 12V or +24V from the DC+ terminal to either of these
terminals, it will have the same effect.
The main reason for doing this is to support
day/night operations. For example, you could
allow all User codes to be active during the day
but disable them at night by closing a switch
between SRC and UCD. The Hard code would be
the only method of entry at night. Or, you could
have no Hard code programmed so that there
would be no entry at night. This could be done by
timer controlled contacts from a timer such as
Securitron’s model DT-7. It’s finally possible to flip the codes (Hard and all User) so that, for
example, User codes are active only during the day and the Hard code is active only at night.
An SPDT switch or relay is needed to do this as the drawing to the right shows. Note that you
won’t be able to use one of these disabling features (Hard or User) if you have implemented the
door prop alarm (Section 6.4) or anti-tailgating (Section 7.4) features. These reassign one of
the terminals.
7.3 ALARM SYSTEM SHUNTING
The DK-26's lock control relay is of the double pole, double throw type. Note that in all the
other drawings in this manual, we show only one of the poles being used (C1, NC1 and NO1).
The most common use for the second pole (C2, NC2 and NO2) is to shunt out an alarm
system, which would be connected to the door when the DK-26 is being utilized. The idea is
that if the door opens without the DK-26 having been activated, an alarm signal should result.
When the DK-26 is employed to open the door, the alarm signal should be shunted.
The alarm system will be connected to a door switch or other detector at the door via two wires.
You will need to determine if this “loop” is closed when the door is closed and opens when the
door opens (the most common) or is open when the door is closed and closes when the door
opens. In the former case (closed when the door is closed), splice wires respectively from C2
and NO2 into the wires from the detector or switch. When the DK-26 operates, this connection
will close preventing the alarm loop from opening (alarm condition). In the latter case (open
when the door is closed), cut one of the alarm loop wires and splice wires respectively from C2
and NC2 into the ends of this wire. When the DK-26 operates, this connection will open
preventing the alarm loop from closing (alarm condition).
FIG 8 WIRING TO SHUNT ALARM SYSTEM ON DOOR
NC2
C2
NO2
DOOR
SWITCH
NC2
C2
NO2
DOOR
SWITCH
ALARM SIGNAL WHICH IS
CLOSED WHEN DOOR IS CLOSED;
OPENS TO ALARM
ALARM SIGNAL WHICH IS
OPEN WHEN DOOR IS CLOSED;
CLOSES TO ALARM
CUT EITHER
WIRE FROM
SWITCH
TO ALARM PANEL
TO ALARM PANEL
SRC REX UCD HCD
C
NC
NO
SPDT
SWITCH
OR RELAY
WITH THE CONTACTS
AS SHOWN, THE HARD
CODE IS DISABLED.
WHEN THEY SWITCH,
ALL USER CODES
WILL BE DISABLED.
Содержание Securitron DK-26
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