Communication To The Card
Communication from the reader to the card uses an amplitude-shift keying with 10% or 100% modulation index.
The data coding is:
- 1 out of 4 pulse position modulation
- 2 bits are coded as the position of a 9.44 µs pause in a 75.52 µs symbol time, giving a bit rate of 26.48 kilobits per second The least-significant bits are sent first.
- 1 out of 256 pulse position modulation
- 8 bits are coded as the position of a 9.44 µs pause in a 4.833 ms symbol time, giving a bit rate of 1.65 kbit/s.
Read more about this topic: ISO/IEC 15693
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