Table of Contents
Advertisement
Appendix 2 - ISO 7811/2-1995 - Track 2 Data clock format
Compliant with ISO07811/2-1995 - Track 2.
Data encoding table
Value
0
1
2
3
4
5
6
7
8
9
10 (A
11 (B
12 (C
13 (D
14 (E
15 (F
The least significant bit of every digit is sent first; the fifth bit is
an odd parity bit for each group of four data bits.
The complete message always looks as follows:
left
edge
The LRC is calculated by the following procedure: each of the
4 bits in the LRC character is an even parity bit of the equivalent
bits in the telegram including start and stop sentinel.
The fifth bit is the odd parity of the four LRC bits (it is not
calculated over all the parity bits).
Bit pattern
0 0 0 0-1
1 0 0 0-0
0 1 0 0-0
1 1 0 0-1
0 0 1 0-0
1 0 1 0-1
0 1 1 0-1
1 1 1 0-0
0 0 0 1-0
1 0 0 1-1
)
0 1 0 1-1
hex
)
1 1 0 1-0
hex
)
0 0 1 1-1
hex
)
1 0 1 1-0
hex
)
0 1 1 1-0
hex
)
1 1 1 1-1
hex
start
characters
Appendix 2
Meaning
"0"
"1"
"2"
"3"
"4"
"5"
"6"
"7"
"8"
"9"
unused character
start sentinel (start character)
unused character
field separator
unused character
end sentinel (stop character)
data
end
LRC
right
edge
77
Advertisement
Chapters
Table of Contents
