User's Manual

52
A) The keyed-in Code is 1 2 3 4 5 6 7 8
The Code in Decimal Number : 1 2 3 4 5 6 7 8
The Code 1 2 3 4 5 6 7 8 Equivalent to Hex Number : B C 6 1 4 E
Precaution 1
A 26-bit Wiegand data is composed of 2 parity bits and 24 data bits. It is necessary to limit the
8-digit user codes to below 16,777,215 (=FFFFFF) to prevent the data over 24-bit and causing error.
The Wiegand data in 34-bit or 37-bit covers the 8-digit user codes in full value (up to 99,999,999)
without error.
Precaution 2
The HEX code of Wiegand data is derived from the user code. Do NOT make an user code starting
with “0”, such as 02345. Otherwise it will cause confusion in Hex code with the user code in same
number without “0” at the front. Please see examples B & C below for the explanations. This
precaution applies to 26-bit, 34-bit and 37-bit Wiegand data.
Example A shows a 34-bit Wiegand data derived from an 8-digit User Code 12345678.
Example B and C show the Wiegand outputs derived from User Codes 1234 and 00001234. Their
Hex binary codes derive from the two User Codes in Wiegand format are identical and can not be
discriminated from each other.
EXAMPLE:
0 1 0 0 1 1 1 0 01 0 0 0 0 0 0 0 0 1 0 1 1 1 1 0 0 0 1 1 0 0 0 0 1
The 34 bits Wiegand data sending out in Binary from entry of the Code:
E 0 0 B C 6 1 4 E O
Wiegand Data Output From User Codes
Wiegand data is also a common media between keypad unit and control panel for the user codes in an
access control system. This reader-keypad accepts user codes up to 8 digits for generating Wiegand
data. Some precautions are required in taking user code to generate Wiegand data.
An Odd Parity Bit of 6 1 4 E = 0
An Even Parity Bit of 0 0 B C = 1