CP60 and CP60 Plus Service Manual 2-31
6. The clock signal is activated.
7. The reader releases the Reset by bringing it to a high voltage.
8. The card then issues its Answer To Reset (ATR). The ATR is a hexadecimal
string up to 32 characters and contains:
• The format of the communication
• Permissible baud rates
• Parameters of the circuitry in the card
• Required programming voltage on Vpp
• The make and model of the card
• Other information the manufacturer chooses
9. With communication parameters known, the interface can begin to
communicate with the card.
10. Serial communication across the I/O line commences.
11. If necessary, the voltage on Vpp is altered, and information can be written to
the card.
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