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I have a strange problem. When i emulate a tag with the ACR122U it normally emulate a ISO 14443-4 (NfcA) tag. This always works in the following sequence:

  • Start emulating with tgInitAsTarget
  • Phone on the reader
  • Transaction succesfull
  • Phone off the reader

But in this sequence below the emulated tag is recognized as a JIS 9319-4 tag

  • Start emulating with tgInitAsTarget
  • Put phone on the reader
  • Transaction error
  • Retransmit tgInitAsTarget
  • Not a ISO 14443-4 tag anymore
  • Phone off the reader

So if i keep my phone on the reader and start another tgInitAsTarget it doesn't recognize the tag correcly. Why is this?

Regards,

S.Pols
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  • I can confirm that this is a known problem and seems to be related to how the PN532 NFC chip inside the ACR122U performs card emulation. Unfortunately we did not find a solution to this so far. – Michael Roland Aug 29 '14 at 15:44

0 Answers0