Patent ID: 7042903

Claim:
A method of conveying commands from a terminal to a portable electronic object, every command having a header, and some of the commands having a data field, and responses from the portable electronic object to the terminal, some of the responses having a data field, and every response having a trailer, said method comprising the following steps: interchanging transactions by means of a bus between the terminal and the object, each downlink transaction comprising successively a token packet transmitted from the terminal to the object, a separate data packet transmitted from the terminal to the object, and a handshake packet transmitted from the object to the terminal, and each uplink transaction comprising a token packet transmitted from the terminal to the object, a data packet transmitted from the object to the terminal, and a handshake packet transmitted from the terminal to the object; encapsulating the header of each command in a data field of the data packet of a downlink transaction, and the data field of a command, when such a data field exists, in the data field of at least one downlink transaction; and encapsulating the data field, when such a data field exists, and the trailer of each response in the data field of the data packet of at least one uplink transaction.