11/30/2022 0 Comments Software acr38 smart card reader![]() ![]() ![]() ![]() Other contactless cards though, such as MIFARE Ultralight or MIFARE Classic, are less intelligent and don’t have an on-board micro, or a proper ATR, in which case the reader or reader driver will effectively make one up, usually according to the PC/SC standard, to indicate the type of card found. The contactless smart card reader will energise the card when it enters the RF field, and receive the same or a similar ATR, after which two-way comms is established with the on-board microprocessor. With contactless smart card technology, some cards, such as dual-interface Java cards, work in a similar way, even though the comms is done wirelessly. This is usually a fixed sequence for any particular make and model of card, and is intended to tell the reader/system some (limited) information about the card and its capabilities, for example the maximum speed it can operate at, and its preferred voltage and clock frequency.Īfter receiving the ATR, the reader, reader drivers and/or host software can then adjust various parameters before getting stuck in with talking to the card (we’ll come to that bit later!) When a contact smart card is inserted into a smart card reader, such as the popular ACR38, Omnikey 3121 or Cloud 2700R, the reader sends power and a reset signal to the card, and the card responds with a dozen or more bytes of data known as the Answer To Reset (ATR). These contacts provide a relatively simple two-way serial comms interface, over which a PC or another system can talk to the card, sending it commands and getting back responses. Smart cards started out purely as plastic cards with chip modules embedded into them, with the usual pattern of gold or silver contacts in a standard position. The following is taken from What’s an ATR, APDU.? Smart card terminology explained | Smartcard Focus Buzz! ![]()
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