Rev. A.2, 10/03 Page-17
To return the red/green LED logic to factory set default, put the unit into program mode and
enter 7-4.
6. USE OF THE PROGRAMMABLE RELAY
The DK-26 CPU board includes a second relay whose 5 Amp, SPDT contacts are marked CX,
NCX and NOX (see Figure 2). This relay is employed for different functions which are selected
by commands sent to the CPU board while the unit is in program mode. In general, you need to
choose the function you want to make active for this relay (if any) and the following sections lay
out the choices.
6.1 DOORBELL FUNCTION
As delivered, the programmable relay will operate when the Bell key is pressed when the unit is
in “normal” operating mode (ready to accept a code). The Bell key is used a great deal in
programming operations but the relay will not operate during programming (including
initiating and exiting programming mode).
The purpose for this is to operate a real doorbell so that unauthorized
persons outside the controlled door can request entry. Most
commercial doorbells are furnished with their own power supply, so
typical wiring is as shown in the drawing to the right.
Note that if you don’t plan to use this function, a blank rectangular
label is supplied which can be used to cover the “BELL” legend on
the keypad face. This avoids misleading a person on the outside of
the door.
6.2 DURESS FUNCTION
The duress function is used for high security applications. It allows a person being threatened
to release the door but simultaneously create a silent alarm which would be employed to
summon assistance. To make this work, obviously the threatened authorized person has to
enter something different than a standard User code.
The DK-26 handles this requirement by establishing the Hard code as a duress code. You need
to do several things however to implement this.
Ordinary operation must be via one or more User codes (see Section 4.2 for
programming)
Program the Hard code as your duress code (see Section 4.1).
Put the unit in program mode , and enter 7-5. You will see the two flash confirmation.
Exit program mode by pressing the Bell key or waiting 30 seconds.
Now, when you enter a user code, the door will open but when you enter the Hard code, the
door will open and the programmable relay will switch. The door will remain open for the
amount of time programmed but the programmable relay will stay switched (it latches) until
the hard code is entered a second time to reset it. Use the programmable relay contacts
(CX, NOX and NCX) to report the releasing of the door under duress. This can be done by
interfacing with an alarm panel or dialer. Note that a duress code is rarely used. To make the
code easier to remember, you can select a Hard code that is close to the User code (if only one
User code is being employed) or you can select a short hard code. Note finally that selection of
this option means you give up the opportunity to implement a doorbell or other use of the
programmable relay.
CX NOX
DOORBELL
POWER
SUPPLY