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TABLE OF CONTENTS
SECTION 1. DECODING READER OUTPUT............................................................................................. 1
REFERENCE DOCUMENTS ................................................................................................................... 2
MAGTEK DOCUMENTS INCLUDED IN THIS MANUAL ......................................................................... 2
TRACK 1 DATA FORMAT........................................................................................................................ 3
TRACKS 2 AND 3 DATA FORMAT.......................................................................................................... 4
SECTION 2. ENCODING............................................................................................................................. 7
TIMING ................................................................................................................................................... 10
DATA ...................................................................................................................................................... 10
STROBE ................................................................................................................................................. 10
CARD PRESENT.................................................................................................................................... 10
SECTION 3. LRC CALCULATION............................................................................................................ 13
SECTION 4. ERROR CHECKING............................................................................................................. 15
ERROR CHECKS BY A TYPICAL READER ......................................................................................... 15
ERROR CHECKING, TRACK 2, WITH AN INTEL 8751 ........................................................................ 16
INSERTION READERS.......................................................................................................................... 18
SECTION 5. BIDIRECTIONAL READING AND AMPLITUDE VARIATIONS.......................................... 19
READING IN ONE DIRECTION VERSES BOTH DIRECTIONS ........................................................... 19
CARD READBACK AMPLITUDE VARIATIONS .................................................................................... 20
APPENDIX A. CHARACTER CONVERSION ........................................................................................... 21
TRACK 1 CHARACTER SET ................................................................................................................. 21
TRACK 2 AND 3 CHARACTER SET ..................................................................................................... 21
APPENDIX B. READ IC 21006516 SPEC SHEET ................................................................................... 23
APPENDIX C. STANDARDS .................................................................................................................... 27
APPENDIX D. CARD READER INTERFACE........................................................................................... 29
INTERFACING THE CARD READER TO A MICROPROCESSOR ...................................................... 29
SINGLE - BIT INPUT PROGRAMMING................................................................................................. 29
USART.................................................................................................................................................... 29
DETECTING START SENTINEL............................................................................................................ 30
BIDIRECTIONAL READING................................................................................................................... 30
CONVERTING CARD DATA TO ASCII DATA....................................................................................... 30
TRACK 1................................................................................................................................................. 30
TRACK 2 & 3 .......................................................................................................................................... 30
FIGURES
Figure 2-1. Bit Cell - Flux Transition -----------------------------------------------------------------------------------------8
Figure 2-2. Card Coding --------------------------------------------------------------------------------------------------------9
Figure 2-3. Timing -------------------------------------------------------------------------------------------------------------- 10
