HID MaxiProx Installation Guide - Manual (Page 18)

Part No. 5375-901, Rev E.1 MaxiProx
®
Installation Guide
Page 18 of 19 March 2012
© 2008 - 2012 HID Global Corporation. All rights reserved.
Case 2:
Customer Code
= 74
are structured as follows:
421 8421 8421 8421 8421 8421 8421 8421 8421 8421 8421
CCC CCCC 1 aaaa bbbb cccc dddd eeee ffff gggg hhhh iiii
CCC CCCC
- Customer code
1 - fixed bit “1”
aaaa - Most significant nibble of message
bbbb - Second MSN
cccc - next nibble
hhhh - least significant nibble of message
iiii - LRC of nibbles aaaa to hhhh, start (B) and end sentinel (F) (xor of the nibbles or the even parity of the
respective column)
The output from the reader will look like the following:
1248p 1248p 1248p 1248p 1248p 1248p 1248p 1248p 1248p 1248p 1248p
start data a data b data c data d data e data f data g data h end LRC
The message structure follows the ISO/ABA Track 2 standard. The first character is a start sentinel: B
(hex), which is followed by data. After the data there is an end sentinel:
F
(hex), followed by an LRC.
The LRC is the xoring of the message in accordance to the bit position. Each character has an odd
parity bit that covers bit 1 to bit 4 of the nibble.
A typical message:
B 1 2 3 F LRC
the bits broken down:
1248p 1248p 1248p 1248p 1248p 1248p
11010 10000 01000 11001 11111 00101
B 1 2 3 F 4
start < data > end LRC
4.2.5 Bit Stream
The bit stream will consist of 25 leading zeros, the message and fill with zeros until the end of the
message. The message will consist of a minimum of 210 bits.
Example
00000000000000000000000000 11010 10000 01000 11001 11111 00100 00000000000000...000000
B 1 2 3 F LRC
4.2.6 Output Specification
Vol = 0.8 V
Voh = 3.5 V
sink = 25 ma
source = 5 ma