Part No. 5375-901, Rev E.1
MaxiProx
®
Installation Guide
Page 14 of 19
March 2012
© 2008 - 2012 HID Global Corporation. All rights reserved.
3.4
Transponder Types
The type of transponder used affects the read range of the MaxiProx. The various styles of HID cards
and transponders use different types of antennas. The antenna type will determine the read range for
that type of transponder. The Vehicle ID tag provides the longest read range at 32-36 inches; the
ProxCard II is 24-29 inches. The IsoProx / DuoProx is 17-20 inches. The ProxKey reads at a distance
of 15-17 inches.
Note:
The above are recommended installation procedures. All local, state and national electrical
codes have precedence.
4
Application Notes
The Application Notes section includes information about Wiegand, Clock-and-Data, and RS232/RS422
Card Message specification.
4.1
Wiegand Interface
The following outlines the MaxiProx Wiegand Interface.
4.1.1
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.
