THE 34 BIT WIEGAND DATA OUTPUT FROM THE ENTRY OF USER PINS
Wiegand is a commonly used interface between keypad with user PINs and control panels used in access control.
The keypad unit accepts User PINs up to 8 digits maximum in decimal numbers. The Wiegand data protocol has been
made to 34 bits to accommodate the maximum PIN length without causing code error (26 bits Wiegand data causes
error to number 16,777,215 or any number above 16,777,215).
The 34 bit Wiegand protocol for PINs has 1 first parity bit, 32 bits for the PIN code, and 1 stop bit for a total of 34 bits.
The first parity bit is an
Even parity
bit calculated from the first 16 bits of the code and the trailing parity bit is an
Odd
parity
bit from the last 16 bits.
Example : Wiegand Output from PIN / Code Entry
A) The keyed-in PIN is 1 2 3 4 5 6 7 8
The PIN in Decimal Number : 1 2 3 4 5 6 7 8
The PIN 1 2 3 4 5 6 7 8 Equivalent to Hex Number : B C 6 1 4 E
E 0 0 B C 6 1 4 E O
An
E
ven Parity Bit of
0 0 B C = 1
An
O
dd Parity Bit of
6 1 4 E = 0
The 34 bits Wiegand data sending out in Binary from entry of the PIN:
1 0 0 0 0 0 0 0 0 1 0 1 1 1 1 0 0 0 1 1 0 0 0 0 1 0 1 0 0 1 1 1 0 0
B) The keyed-in PIN is 1 2 3 4
The PIN in Decimal Number : 1 2 3 4
The PIN 1 2 3 4 Equivalent to Hex Number : 4 D 2
E 0 0 0 0 0 4 D 2 O
An
E
ven Parity Bit of
0 0 0 0 = 0
An
O
dd Parity Bit of
0 4 D 2 = 0
The 34 bits Wiegand data sending out in Binary from entry of the PIN:
0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 1 0 0 1 1 0 1 0 0 1 0 0
C) The keyed-in PIN is 0 0 0 0 1 2 3 4
The PIN in Decimal Number : 0 0 0 0 1 2 3 4
The PIN 0 0 0 0 1 2 3 4 Equivalent to Hex Number : 4 D 2
E 0 0 0 0 0 4 D 2 O
An
E
ven Parity Bit of
0 0 0 0 = 0
An
O
dd Parity Bit of
0 4 D 2 = 0
The 34 bits Wiegand data sending out in Binary from entry of the PIN:
0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 1 0 0 1 1 0 1 0 0 1 0 0
Important Note:
a) From the above examples (B) & (C), The PINs 1 2 3 4 and 0 0 0 0 1 2 3 4 give the same Wiegand data output in Binary.
b) Pressing any number of only 0’s prior to the PIN makes error code in Binary. Do NOT program the PIN with 0’s in
front of it.
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