METHOD FOR COMMUNICATING BY A DETECTOR OF THE PRESENCE OF CHIP CARDS IN A READER, CHIP CARDS AND A READING DEVICE COMMUNICATING BY THE PRESENCE DETECTOR

摘要

The invention relates to a method for switching communication channels enabling a card reader to communicate with several card circuits, each of which is provided with a communication channel. Said reader applies voltage to the card by electric contacts arranged on a connection button. The reader transmits a control signal for controlling the commutation of the communication channels to an electric contact, which is located on the inserted section of the card but not on the button. Finally, the reader sets the activation signals for at least one circuit in order to enable said circuit to communicate through the connection button. A removable device and a receiver for reading said device are also disclosed.