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3.2 LED AND “TRANSMIT DATA” WIRING
The LED’s on the DK-26W follow the convention for card readers. When a “high” signal (+5
VDC) is connected to the LED terminal, the red LED will be on and the green LED will be off.
When this input goes “low” (0 VDC), the green LED will be on and the red LED will be off. This
flipping of the LED’s is controlled by the access system and typically prompts the user when his
entry has been accepted (or not accepted).
The “transmit data” terminal is not used with most systems. When it is unconnected, the code
sequence is automatically transmitted to the system following key entry (see Section 5).
However, with some systems, the controller can be busy and must therefore remotely command
data transmission. If this input is in a low state (connected to 0 VDC), the DK-26W will store the
code sequence until the input goes high (re5 VDC). The code will then be transmitted
as the system will be prepared to receive the sequence and release the door. Naturally, while a
code is being stored, the keypad will ignore further inputs as the delay prior to the system
commanding transmission of the code sequence will be very brief.
4. FACILITY (SITE) CODE PROGRAMMING
In the Weigand 26 bit code format (also called 2601), the first eight active bits constitute a
facility or site code. These eight bits correspond to standard numbers 0-254. The access
control system normally expects to see a “two part” transmission wherein the eight bit facility
code precedes the 16 bit PIN code which identifies the individual who is requesting entry.
Possible PIN codes convert to standard numbers 0-65,534. The reason for the creation of the
facility code is to enhance card security as on a card, both the facility and PIN codes are stored.
If a card was transported to a different facility, it would not be accepted by the different system
even though the PIN code happened to be valid because the facility code would not be.
With a digital keypad like the DK-26W, the facility code required by the system must be
internally stored since a person requesting entry will only know his PIN code. The DK-26W
ships with a
factory set facility code of “0”.
To
change the facility code
to the one in use by
the system, identify the program button on the unit’s CPU board (see Figure 2). With the unit
powered, press the button until you hear a steady beep. This annunciates
facility code
program mode
. If you do nothing, the unit will automatically drop out of program mode
in 30
seconds
and the facility code will not be changed. To change the code, during this 30 second
window, simply enter the new facility code. You don’t have to enter three digits if the facility
code is less than 100 (leading zeros are not necessary). Do not pause more then five seconds
between digits as the unit has an internal timer that resets five seconds after a key press. After
you have completed site code entry, you can press “BELL” to terminate the sequence or simply
wait five seconds. You will receive a
single beep to confirm a good entry
. If you have
entered a sequence that is too large (a number greater than 254), you will receive a
double
beep
(error). This is your prompt to re-enter the code. To do this, you will have to press the
program button another time as the unit will not remain in program mode after data entry.
The DK-26W employs non-volatile EEPROM memory so that the facility code is
retained in a
power failure
.
5. OPERATION
To operate the unit, simply enter the PIN code (from 0-65534) and then either press BELL or
wait five seconds. Note that successful key presses are
echoed by a beep
. The PIN code
together with the site code prefix stored in the unit will then be sent to the access control
system.
Do not pause more than five seconds
between digits or an incomplete sequence will
be transmitted as the unit automatically transmits when it does not see any key presses for five
seconds. The system will respond by allowing entry or not and will generally annunciate this by
control of the two LED’s. How the LED’s are used exactly will vary from system to system. If
you enter a number larger than 65,534, the DK-26W will reject the sequence and transmit
nothing. This rejection is communicated by two beeps (the error signal).
5.1 DUAL PAD OPERATION
If keypad control from both sides of the door is desired,
two keypads can be connected to
one CPU Board
. Simply put the colored wires from both keypads into the appropriate terminals
on the CPU Board such that two wires are in each terminal. Either keypad will then be able to
transmit a code and both keypads will beep and illuminate their LED's when either one is used.
Two is the maximum number of keypads that can be connected to one CPU Board. Note that in
the unusual case where both keypads are being used simultaneously, the code will not be
properly sent as the sequence will certainly be disturbed. Only one keypad may be used at a
time.
Be sure you don’t violate egress building codes when employing a keypad on the
inside of a door. Check with your local building or fire department.
