User's Manual

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HID Corporation, 9292 Jeronimo Road, Irvine, CA 92618-1905, USA •Tel: [phone], Fax: [phone]
http://www.hidcorp.com MaxiProx Reader Installation Manual 5375-900 REV 06
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1248p 1248p 1248p1248p 1248p1248p 1248p1248p1248p1248p 1248p1248p1248p 1248p 1248p 1248p 1248p1248p1248p
<B> c000p Ccc0p CCC0p a000p dcb0p gfe0p jih0p mlk0p pon0p srq0p vut0p yxw0p BAz0p EDC0p HGF0p KJI0p <F><LRC>
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
<B> <aaaap> <bbbbp> <ccccp> <ddddp> <eeeep> <ffffp> <ggggp> <hhhhp> <F> <iiiip>
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