ACR122U USB NFC Reader Application Programming Interface V2.04 Subject to change without prior notice
[email protected] www.acs.com.hk Table of Contents 1.0. Introduction ............................................................................................................. 4 1.1. Features ................................................................................................................................. 4 1.2. USB Interface ........................................................................................................................ 5 2.0. Implementation ........................................................................................................ 6 2.1. Communication Flow Chart of ACR122U .............................................................................. 6 2.2. Smart Card Reader Interface Overview ................................................................................ 7 3.0. PICC Interface Description ..................................................................................... 8 3.1. ATR Generation ..................................................................................................................... 8 3.1.1. ATR format for ISO 14443 Part 3 PICCs ...................................................................... 8 3.1.2. ATR format for ISO 14443 Part 4 PICCs ...................................................................... 9 4.0. PICC Commands for General Purposes .............................................................. 11 4.1. Get Data..............................................................................................................................