ACR122 - Card Emulation

Question

How can I get the NFC contactless reader ACR122U to behave as a tag (card emulation mode)? The prospectus claims that the device can do card emulation, but the SDK does not seem

Answer 1

For "Card Emulation" or in other words, "Configure as target and wait for initiators", please refer to here: http://code.google.com/p/nfcip-java/source/browse/trunk/nfcip-java/doc/ACR122_PN53x.txt

** Command to PN532 **
0xd4 0x8c TgInitAsTarget instruction code
0x00 Acceptable modes
(0x00 = allow all, 0x01 = only allow to be
initialized as passive, 0x02 = allow DEP only)

_6 bytes (_MIFARE_)_:
0x08 0x00 SENS_RES
0x12 0x34 0x56 NFCID1
0x40 SEL_RES

_18 bytes (_Felica_)_:
0x01 0xfe 0xa2 0xa3 0xa4 0xa5 0xa6 0xa7
NFCID2
0xc0 0xc1 0xc2 0xc3 0xc4 0xc5 0xc6 0xc7
?
0xff 0xff System parameters?
0xaa 0x99 0x88 0x77 0x66 0x55 0x44 0x33 0x22 0x11
NFCID3
0x00 ?
0x00 ?

This is the response when an initiator activated this target:

** Response from PN532 **
0xd5 0x8d TgInitAsTarget response code
0x04 Mode
(0x04 = DEP, 106kbps)

Let me know if it works!