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Figure 4: Data Timing - Timing Chart
card present
data
clock/
strobe
Note: the first 25 bits and trailing bits are zeros, not shown above.
§
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
4.2.3 Output signal Levels
Inputs: low threshold = 0.8 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
Case 1:
Customer Code =
The output is in the
Where
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
Проектирование. Монтаж. Продажа. - http://vskd.ru
0 0 0
0 0 0 0 0
1 1 1
1st valid bit
bit time
message format in accordance with the following rules based on customer code:
0, 1, 63, 72, 73
or other, will have the data output as follows.
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
cccCCCC
is the customer code,
MaxiProx DFM Reader Installation Manual 5375-901 Rev D
0 0 0 0
1 1 1 1
1
strobe width
high threshold = 3.5 volts
abc...IJK
is the programmed data on the card.
Track 2
.
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