定義 Command APDU header (Mandatory) body (Optional) Response APDU body (Optional) trailer (Mandatory) C-APDU / R-APDUパターン (4 cases) Case 1 - No command data, no reponse data Case 2 - No command data, send reponse data Case 3 - Receive command data, no reponse data Case 4 - Receive command data, send reponse data Status Word Link cardwerk.com 定義 ISO 7816-4で定義したSmart Card向け通信プロトコル CAD(Card Acceptance