Application protocol data units are conveyed in a universal serial bus so that a portable electronic object such as a smart card can be recognized by a terminal, such as a micro-computer, as being a peripheral. The header and the data field, when such a data field exists, of each command are encapsulated...http://www.google.de/patents/US20060176903?utm_source=gb-gplus-sharePatent US20060176903 - Conveying protocol units for portable electronic objects via a protocol for microcomputer peripherals
