HID Corporation, 9292 Jeronimo Road, Irvine, CA 92618-1905, USA • Tel: (949) 598-1600, (800) 237-7769, Fax: (949) 598-1690
http://www.hidcorp.com
MaxiProx DFM Reader Installation Manual 5375-901 Rev D
Page
15 of 20
Chapter 4 Application Notes
4.1
4.1 Wiegand Interface Description
Wiegand Interface Description
4.1.1 Wiegand Message Format
In the Wiegand format, the ID card is programmed with a specific bit pattern and the Reader acquires
the data, checks the customer code and generally sends out the same bit pattern as previously
programmed on the card. Consult factory for variations to this method. A 26 bit Wiegand format will be
used in the examples below.
The 26 bits of transmission from the Reader to the panel consists of two parity bits and 24 code bits.
The bits are transmitted in the order described. The first bit transmitted is the first parity bit, P1; it is
even parity calculated over the first 12 code bits. The last bit transmitted is the second parity bit, P2; it
is odd parity calculated over the last 12 code bits:
Code Format
1 1 1 1 1 1 1 1 1 1 2 2 2 2 2 2 2
1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6
P1 C C C C C C C C C C C C C C C C C C C C C C C C P2
Parity Format
1 1 1 1 1 1 1 1 1 1 2 2 2 2 2 2 2
1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6
P1 E E E E E E E E E E E E
O O O O O O O O O O O O P2
§
P1
: First, or even parity bit
§
C
: Code bits
§
P2
: Second, or odd parity bit
§
E
: Bits for calculation of even parity
§
O
: Bits for calculation of odd parity
Data format within the 24 code bits which includes the portioning of the bit, the designation of the
Most Significant Bit (MSB)
or the
Least Significant Bit (LSB)
shall be subject to definition by the
panel and Reader manufacturers and may remain proprietary.
4.1.2 Output Specification
The specifications of voltage, current, power and timing are from the perspective of the Reader. A
common signal ground is defined as a voltage reference that is common to both the Reader and the
control panel. The voltages for the data outputs are referenced from the power supply ground located
at the Reader. The voltage measured for the power to the Reader is referenced from the power supply-
return connection location at the Reader, not at the source of the power.
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