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 of switching communication channels enabling a card reader to communicate with several card circuits, each circuit having a communication channel. The reader applies a power supply voltage to the card by electrical contacts arranged on a connection button. The reader transmits a control signal for controlling the switching of the communication channel to an electrical contact located in the inserted part of the card but not on the button. Finally, the reader sets up activation signals for at least one circuit to enable said circuit to communicate via the connection button. The invention also relates to a removable device and a receiver for reading said device.