| 摘要 |
A process for the bidirectional transmission of data, in a hands-free vehicle access system, comprising the step of setting up a remote exchange of data between a recognition device installed in the vehicle and an identifier intended to be carried by a user, access being authorized only when the recognition device has authenticated the identifier, and the steps of setting up an exchange of data at the same radio frequency (RF) exchange between the recognition device and the identifier, and in delaying, in the course of this exchange, the transmission of a response signal by the identifier to the recognition device by a predetermined duration with respect to the reception by the identifier of an interrogation signal transmitted by the recognition device, so that neither the recognition device nor the identifier operate simultaneously in transmission and in reception at the RF exchange.
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