ACR122L – Communication Protocol
Version 1.03
www.acs.com.hk
Page 4 of 57
1.0. Introduction
The ACR122L serial protocol defines the interface between the PC and reader, as well as the
communication channel between the PC and the supported contactless tags/cards – ISO 14443-4
Type A and B, Mifare, ISO 18092 (NFC), and FeliCa. The major applications supported are the
following:
•
Access Control, Identification:
Reading the serial numbers of all cards in the field.
•
Data Storage:
Performing encrypted read-and-write operations.
•
Ticketing:
Performing read, write, increment and decrement operations in an encrypted
environment.
•
Multi-applications:
Performing read, write, increment and decrement operations on various
sectors of the card.
