Summary ISO-IEC 14443 is the specification about contactless cards communication with the card reader, the most important part is Part 3: Initialization and anticollision. Recently worked on it, and a few summary points. ISO-IEC 14443-3 Type A REQA and ATQA PCD (Card reader) send REQA (Request Command) or WUPA (Wake-UP Command), PICC (Card) send back […]