for some PC/SC card readers when accessing an ISO/IEC 14443 Smart Card). The ATR conveys information about the communication parameters proposed by the card, and the card's nature and state.īy extension, ATR often refers to a message obtained from a Smart Card in an early communication stage or from the card reader used to access that card, which may transform the card's message into an ATR-like format (this occurs e.g. An Answer To Reset ( ATR) is a message output by a contact Smart Card conforming to ISO/IEC 7816 standards, following electrical reset of the card's chip by a card reader.
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