acr122u是一款在频率为13.56MHz的射频技术上开发出来的的连机智能卡读写器，符合ISO/IEC18092（NFC）标准。它不仅支持Mifare卡和符合 ISO 14443标准的 A类和B类卡，而且还支持NFC以及FeliCa非接触式技术。(Acr122u is a smart card reader and writer developed in the frequency 13.56MHz radio frequency technology, which is in line wi