HID MaxiProx Installation Guide - Manual (Page 17)

MaxiProx
®
Installation Guide Part No. 5375-901, Rev E.1
March 2012 Page 17 of 19
© 2008-2012 HID Global Corporation. All rights reserved.
4.2.2 Data Timing
The outputs, Card Present, Data and Strobe are low going signals and the following timing chart
describes the timing.
1
0 0 0
1 1 1
0 0 0 0 0
1 1 1 1
0 0 0 0
bit time strobe width
card present
data
clock/
strobe
1st valid bit
Note: the first 25 bits and trailing bits are zeros, not shown above.
Table 11: Data Timing - Timing Chart
• bit time = 1.5ms (default)
• strobe width = bit time/3 (33% of bit time), default = 500us
• Clock/Strobe is valid 1.5ms (one clock cycle, min) after card present is asserted
• Data is valid 10us (min) before the negative edge of clock/strobe
• Card Present returns to the high-level 50 ms (max) after the last clock/strobe.
The above timing is representative of a magnetic stripe card traveling at 8.9 inches per second. The
timing is to be adjustable for cards traveling at 4 inches per second to 20 inches per second. This
relates to bit times of 3.3 ms and 666us, respectively. There are 75 bits per inch on Track 2.
4.2.3 Output signal Levels
Inputs: low threshold = 0.8 volts high threshold = 3.5 volts
4.2.4 Bit structure
The reader will read an 1849 or compatible chip that is encoded with 44 bits of data. The data will be
programmed in accordance with ProxGuard formatting. The data will be packed into the ABA/ISO
Track 2 message format in accordance with the following rules based on customer code:
Case 1:
Customer Code =
0, 1, 63, 72, 73
or other, will have the data output as follows.
The output is in the Track 2 character format but the bits are packed in sets of three bits (octal):
ccc CCCC a bcd efg hij klm nop qrs tuv wxy zAB CDE FGH IJK
Where
cccCCCC
is the customer code,
abc...IJK
is the programmed data on the card.
1248p 1248p 1248p1248p 1248p1248p 1248p1248p1248p1248p 1248p1248p1248p 1248p 1248p 1248p 1248p1248p1248p
c000p Ccc0p CCC0p a000p dcb0p gfe0p jih0p mlk0p pon0p srq0p vut0p yxw0p BAz0p EDC0p HGF0p KJI0p