User's Manual

ACR122L-ACS Design Specification
Version 0.03 19/05/2010
Page
19
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ACR122L
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ACS
Example 1. How to access MIFARE Classic Tags?
Typical sequence may be:
- Scanning the tags in the field (Polling)
- Authentication
- Read / Write the memory of the tag
- Halt the tag (optional)
Step 1) Polling for the MIFARE 1K/4K Tags, 106 kbps
<< 02 6F 09 00 00 00 00 01 00 00 00
FF 00 00 00 04 D4 4A 01 00 [Checksum] 03
>> 02 00 00 03
>> 02 80 0E 00 00 00 00 01 01 00 00
D5 4B 01 01 00 02 18 04 F6 8E 2A 99 90 00 [Checksum] 03
In which, Number of Tag found = [01]; Target number = 01
SENS_RES = 00 02; SEL_RES = 18,
Length of the UID = 4; UID = F6 8E 2A 99
Operation Finished = 90 00
Tip: The tag type can be determined by recognizing the SEL_RES.
SEL_RES of some common tag types.
00 = MIFARE Ultralight
08 = MIFARE 1K
09 = MIFARE MINI
18 = MIFARE 4K
20 = MIFARE DESFIRE
28 = JCOP30
98 = Gemplus MPCOS
Step 2) KEY A Authentication, Block 04, KEY = FF FF FF FF FF FF, UID = F6
8E 2A 99
<< 02 6F 14 00 00 00 00 00 01 00 00 00
FF 00 00 00 0F D4 40 01 60 04 FF FF FF FF FF FF F6 8E 2A 99 [Checksum]
03
>> 02 00 00 03
>> 02 80 05 00 00 00 00 01 01 00 00
D5 41 [00] 90 00 [Checksum] 03