The ACR122S NFC Contactless Smart Card Reader is the serial interface reader in the ACR122 family developed based on the 13.56 MHz Contactless (RFID) Technology and compliant with the ISO/IEC 18092 Standard for Near Field Communication (NFC). It supports MIFARE®, ISO 14443 Type A and B, and all four types of NFC tags.

ACR122S is a plug-and-play device which does not require any driver installation. It comes with a built-in ISO 7816 SAM slot for enhanced security, plus a buzzer and two LEDs for rich user interaction. ACR122S can also read and write faster and more efficiently by making use of up to 424 Kbps for tag access. The proximity operating distance of ACR122S is up to 5 cm, depending on the type of tag used.

ACR122S is also available in module form for easy integration into bigger machines, like POS terminals, physical access devices and vending machines. Typical applications of the ACR122S reader include e-payment, e-ticketing for events and mass transit, toll road fare collection, and network authentication.

  • Serial RS-232 Interface: Baud Rate = 115200 bps, 8-N-1    
  • USB interface for power supply    
  • CCID-like fram format (Binary format)    
  • Smart Card Reader:    
    • Read/Write speed of up to 424 kbps    
    • Built-in antenna for contactless tag access, with card reading distance of up to 50 mm (depending on tag type)    
    • Supports ISO 14443 Type A and B, MIFARE, FeliCa, and all 4 types of NFC (ISO/IEC 18092) tags
    • Built-in anti-collision feature (only one tag is accessed at any time)    
    • ISO 7816-compliant SAM slot    
  • Built-in Peripherals:    
    • Two user-controllable LEDs    
    • User-controllable buzzer    



  • e-Government
  • Banking & Payment
  • Network Security
  • Access Control
  • e-Purse & Loyalty
  • Transportation
Dimensions 120.5 mm (L) x 72.0 mm (W) x 20.4 mm (H)
Weight 148.0 g
Interface RS232 for data communication, USB for power transmission
Operating Distance Up to 50 mm (depends on the tag type)
Supply Voltage Regulated 5V DC
Supply Current 200 mA (operating); 50 mA (standby); 100 mA (normal)
Operating Temperature 0 - 50 °C
Operating Frequency 13.56 MHz
Smart Card Interface Support
  • ISO14443 Type A & B
  • MIFARE
  • FeliCa
  • 4 types of NFC (ISO/IEC18092) tags
Compliance / Certifications
  • ISO 18092, ISO14443, CE, FCC, VCCI, KC,  RoHS 2
Operating System Support
  • Windows®
  • Linux®

Drivers for ACR122S

Release Date Drivers OS Support Version File Size Notes
USB Interface
24-Aug-2015 MSI Installer for PC/SC Driver (32-bit) Win 2000, Win XP, Win Vista, Win 7, Win 8, Win 8.1, Win10 , Win Server 2003, Server 2003 R2, Win Server 2008 4.0.7.1 3 MB
24-Aug-2015 MSI Installer for PC/SC Driver (64-bit) Win XP x64, Win Vista x64, Win 7 x64, Win 8 x64, Win 8.1 x64, Win10 x64, Win Server 2003 x64, Win Server 2003 R2 x64, Win Server 2008 x64, Win Server 2008 R2 x64, Win Server 2012 x64, Win 2012 R2 x64 4.0.7.1 2 MB
14-Nov-2014 MSI Installer for PC/SC Driver (32-bit) Win 7 (for users who did not install required Microsoft Windows Updates and get driver signature error (Code 52)) 4.0.6.0 3 MB
14-Nov-2014 MSI Installer for PC/SC Driver (64-bit) Win 7 x64 (for users who did not install required Microsoft Windows Updates and get driver signature error (Code 52)) 4.0.6.0 2 MB
20-Aug-2015 PC/SC Drivers Win 2000, Win XP, Win XP x64, Win Vista, Win Vista x64, Win 7, Win 7 x64, Win 8, Win 8 x64, Win 8.1, Win 8.1 x64, Win 10, Win 10 x64,Win Server 2003, Win Server 2003 x64, Win Server 2003 R2, Win Server 2003 R2 x64, Win Server 2008, Win Server 2008 x64, Win Server 2008 R2 x64, Win Server 2012 x64, Win Server 2012 R2 x64 4.0.0.7 842 KB
22-Jun-2016 PC/SC Drivers Linux, Mac 10.5, Mac 10.6, Mac 10.7, Mac 10.8, Mac 10.9, Mac 10.10, Mac 10.11 1.1.3 436 KB
24-Jun-2016 PC/SC Driver Package Linux 1.1.3 2 MB
22-Jun-2016 PC/SC Driver Installer Mac 10.5, Mac 10.6, Mac 10.7, Mac 10.8, Mac 10.9, Mac 10.10, Mac 10.11 1.1.3 248 KB
12-Sep-2011 CT-API Library Win 2000, Win XP, Win XP x64, Win Vista, Win Vista x64, Win 7, Win 7 x64, Win 8, Win 8 x64, Win Server 2003, Win Server 2003 x64, Win Server 2003 R2, Win Server 2003 R2 x64, Win Server 2008, Win Server 2008 x64, Win Server 2008 R2 x64, Win Server 2012 x64 1.0.0.1 2 MB
12-Sep-2011 CT-API Library Linux 1.0.0 62 KB
12-Sep-2011 CT-API Library Mac 10.5, Mac 10.6, Mac 10.7, Mac 10.8, Mac 10.9 1.0.0 35 KB
31-Mar-2016 Android EVK Android 3.1 and above 1.1.3 472 KB

Manuals / Datasheets for ACR122S

Product Presentation

Product Presentation of ACR122S NFC Contactless Smart Card Reader

Technical Specification

Technical Specification of ACR122S NFC Contactless Smart Card Reader

Application Programming Interface

API Driver Manual of ACR122S NFC Contactless Smart Card Reader

Communication Protocol

Communication Protocol Manual of ACR122S NFC Contactless Smart Card Reader