Epson C11C560111 - PLQ 20 B/W Dot-matrix Printer User Manual page 110

Recording layout of magnetic stripe
DIN/ISO, IBM3604, ANSI, ISO7811, IBM4746, and ISO8484
1 block format
SOM
Erase L0
I
2 block format
SOM
Erase L0
I
100
Product Information
EOM
1st Data
1st Block Data Area
LRC
Data
SOM
Gap0 2nd Data
2nd Block Data Area
EOM
T0
LRC
Erase
EOM
T0
LRC
Erase