Personal tools

ACR122U RFID reader

From Eth0Wiki

Jump to: navigation, search
The ACR122U RFID reader.

A couple of months ago, I've bought an RFID reader, since I was looking forward to tinker with the new OV-chipkaart (similar to the UK Oyster card). I started reading a lot about the design of the Mifare 4K contactless smart cards, and about the hacks done by Karsten Nohl at CCC in Berlin, as well as the research done on this subject by Radboud University in Nijmegen, the Netherlands.

On this page I've gathered some specs of the ACR122U contactless smart card reader, which can be used to read and write data stored on the OV-chipkaart.

I'll bring the ACR122U along to eth0, so if anyone wishes to tinker with the RFID cards, be my guest. I also wish to encourage anyone to contribute to this article. If I left anything out, or in case of factual errors, feel free to add/correct.

Some general marketing blabber

The ACR122 is a PC-linked contactless smart card reader/writer developed on the 13.56MHz Contactless (RFID) Technology and followed the ISO/IEC18092 Standard for Near Field Communication (NFC), supporting not only Mifare ISO 14443 A and B cards but also NFC and FeliCa contactless technologies.


  • USB Full Speed (12 Mbps)
  • USB PnP
  • Bi-Color LED
  • Built-in Antenna
  • NFC Reader
    • ISO/IEC18092 (NFC) compliant
    • NFC Tags Access Speed = 424 kbps
  • Contactless Smart Card Reader
    • Support FeliCa card
    • Support ISO 14443 Type A & B cards
      • MIFARE® cards (Classics, DESFire)
  • PC/SC and CCID Compliant
  • CE and FCC Certificated
  • RoHS Compliant
  • User Controllable Buzzer (optional)
  • SAM Socket (optional)

Tech specs

Dimensions: 98 mm (L) x 65 mm (W) x 12.8 mm (H)
Weight: 70 g
Interface: USB
Operating Distance: <= 50mm
Supply Voltage: Regulated 5V DC
Supply Current: 200mA (operating); 50mA (standby); 100mA (normal)
Operating Temperature: 0-50°C
Operating Frequency: 13.56 MHz
Compliance/Certifications: ISO14443 1-4, CE, FCC, RoHS Compliant

The following operating systems are supported:

  • Windows 2000, XP, 2003, Vista
  • Windows XP x64, 2003 x64, Vista x64
  • Windows CE 5.0
  • GNU/Linux

External links


Who will bring rfid cards

  • failbaitr 2 ski-data passes (Andorra Val north / Austria)
  • pluisje 2 Dutch OV-chipcards, 1 Heineken company-acccesscard, if I can find it a ski-data Andorra-pass.
  • Aequitas NS-busyness card (not ov-chipcard, ns-only bussines traveling card, wonder what information it holds)
  • Dekkers 1 student OV chipcard, 1 TU Delft student card
  • Will-Do Does a normal chipcard also works? I have one given to me by school bit in about a month it doesn't work anymore. I also have a new schoolpass. And I have a OV-Student)chipcard (But I like to keep it working)
  • Sander will bring a couple of Mifare 1K cards; these aren't used for the regular OV-chipkaart, but are interesting to tinker with nonetheless.
  • Aldert the usual OV stuff but also some building passes :)
  • mrngm - OV Studentchipcard, NS VDU (expired, though with RFID) and anonymous OV-chipcard

Will-Do: The normal chipcards don't work with the ACR122U. It's an contactless RFID r/w. sander 15:51, 5 January 2010 (CET)

  • I got some old serial 'smartcard reader', have to look up the exact type. This can be used for chipcards like chipknip, I'll try to bring it --MrNGm 02:44, 7 January 2010 (CET)


Found one for 47.94 euro (excl VAT) and 8.34 shipping at this webshop.