Bit Wiegand Keypad Reader; Bit Wiegand Specifications - Essex Electronics K1 Series Installation Instructions Manual

26 Bit Wiegand Keypad Reader

26 Bit Wiegand Specifications


The All-In-One 12-Pad is capable of generating standard 26 Bit Wie-
gand data. DATA 1 and DATA 0 signals are open collector outputs
with 2.2K pull-ups to the internal +5v. The data is sent at
1 msec per bit with a pulse duration of 50 usec. An annunciator
beeps with each key press. When the LED control input is pulled
low, the GREEN LED will be on and the RED LED will be off. When
the input goes high the RED LED is on and the GREEN LED is off.
The LED that is illuminated will blink off with every key press. The
LED control input is pulled to the internal +5v with a 2.2K resistor. An
output is generated with each key press, which can be used to drive
a CCTV or Security Light. Located through the Blue wire (see Con-
nector Wiring), this is an open collector output capable of sinking 1/4
A with a 30 second on time.
The following WIEGAND output is sent each time the # (enter) key
is pressed:
P S S S S S S S S N N N N N N N N N N N N N N N N P
BIT 1 2
BIT 1 is an even parity for the following 12 bits.

The sum of bits 1-13 is even.

BITS 2-9 are the SITE CODE.

BITS 10-25 This is the number(PIN) entered prior to pressing # enter).

Leading 0's are added as required. Bit 10 is most significant.

BIT 26 is an odd parity over the previous 12 bits. The sum of bits 14-26

is odd.
Essex Electronics, Inc. | 805.684.7601 | 800.KEY-LESS | fax 805.684.0232 | keyless.com
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