I've plugged an USB NFC/RFID reader, model ACR112U-A9 provided by ACS Ltd.

Although it is plugged I can't read anything and I keep getting this logs in console:

09/06/15 14:13:00,901 com.apple.SecurityServer[83]: reader ACS ACR122U PICC Interface: state changed 16 -> 34
09/06/15 14:13:00,902 com.apple.SecurityServer[83]: token in reader ACS ACR122U PICC Interface cannot be used (error 229)
09/06/15 14:13:01,249 com.apple.SecurityServer[83]: reader ACS ACR122U PICC Interface: state changed 32 -> 18

How can I solve this issue? Do you know what is the error 229 and why it's triggered?

  • I'm getting the same error. Are you able to resolve this?
    – ksuralta
    Commented Jun 16, 2015 at 1:51
  • Unfortunately not yet. But you can up vote this question to increase its visibility. I'll keep you updated. Commented Jun 16, 2015 at 6:52
  • hey, guys, did you manage to solve this?
    – Ned
    Commented Jul 3, 2015 at 22:48
  • Solved, check the answer below. Commented Jul 5, 2015 at 9:03

2 Answers 2


I found a solution: You need to download the ACS ACR122U Drivers for Mac OS X 10.x.

Here the download page and the direct link for PC/SC Driver Installer 1.1.0 (Mac 10.5, Mac 10.6, Mac 10.7, Mac 10.8, Mac 10.9, Mac 10.10) (2014-09-17 306KB).

You have to install it even if the installer is not properly signed.

It will install the useful driver in: /usr/libexec/SmartCardServices/drivers/ifd-acsccid.bundle

Now you are able to use the card reader. If you want to test it out, I made a simple project here.


The problem with the above answer is that it doesn't work with Mac OS X 10.11.x, as SIP (System Integrity Protection) mechanism blocks any attempts to write to system directories such as /usr/libexec/...

I found that the workaround proposed by Metsma here Re: el capitan 10.11.4 unable to see smartcard solved the problem of "interface or token cannot be used (error 229)" on 10.11.5. Also, once the right symlink was placed - I did not need to install any additional driver. The existing libccid.dylib.1.14.21 proved sufficient.

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