What about input parameters must be considered when the master is read from the slave.
-> Start condition
-> Master sends address and RW = 1
-> Slave by AKN
-> Master reads first byte from slave
-> AKN by MasterCard? How long searches for Arduino "Slave_sender" after the AKN by the master.
-> How to read initialisig of second byte. The start of data transmission should be initiated after the AKN the master?
-> AKN by MasterCard?
Maybe Visa or AmericanExpress? What does this mean?
The slave should acknowledge the master's request by supplying data, not by sending an ACK. The master never needs to acknowledge the slave.