Abstract: A method and system for contactless exchange of information between a read/write unit and at least one information carrier, using wireless radiofrequency signal transmission including an input/output circuit and associated coil device and the information carrier including another input/output circuit and associated coil device, and each further including a processing circuit. The read/write unit transmits radiofrequency signals divided in time slots, each successively including a sync pulse and a single data bit. The radiofrequency signal is suppressed in each time slot for a period differing in length for the one and the zero data bit. The data bit signal, received in the read/write unit solely during transmission of the radiofrequency signal, is sampled, after rectification, for detection of the data bits of the information carrier.