PN532 sends unknown command

Sanderd — Fri, 18 Jul 2025 12:55:34 GMT

Hi,

When we run the PN532 in emulation mode using the I2C interface we see it sends “05 D5 07 90 07 CA 51” to the reader.

Is this some kind of error response? We can’t find anything in the documentation or online about it.

After this command the reader directly deselects the tag.

Here is part of the log:

97568480 | 97577856 | Rdr |02 00 B2 01 1C 00 E2 01 | ok | 97603620 | 97608356 | Tag |F2 07 A7 25 | ok | 97618144 | 97622912 | Rdr |F2 07 A7 25 | ok | 97693476 | 97698212 | Tag |F2 07 A7 25 | ok | 97709648 | 97714416 | Rdr |F2 07 A7 25 | ok | 98564244 | 98629779 | Tag |12 70 81 A0 8F 01 FA 9F 32 01 03 92 04 93 C9 E6 2D 90 | | | | |81 90 07 46 0F A8 6B 59 5B 2E 24 2F D1 A5 CF 21 84 9F | | | | |99 11 88 4C 67 08 1C 0E 88 37 81 ED F5 DB 2E 55 F5 FC | | | | |A5 A3 13 A3 8F 9C 2F 61 3F DE | ok | 98648256 | 98651808 | Rdr |A3 6F C6 | ok | 98737028 | 98802563 | Tag |13 72 20 8D D7 34 70 10 C6 71 25 A5 14 08 6C AB 5B 14 | | | | |6F D0 84 C9 12 6B 87 4A 74 83 2C 89 46 4D 64 89 16 22 | | | | |0D 61 E2 41 7C DA 9E BD EB 72 B9 6B 52 5F C1 04 74 52 | | | | |3B 6D 03 5C C0 A2 EB D8 92 12 | ok | 98821040 | 98824592 | Rdr |A2 E6 D7 | ok | WRITEBLOCK(230) (D720D7B2) 98888308 | 98941364 | Tag |02 60 2E 2D 0C 86 F0 55 47 3C 0C B4 13 F7 AB C9 AB A7 | | | | |59 6D 6A 76 07 D6 09 2B 2C 38 DA 81 E8 CB 8E 3E 1B BA | | | | |F5 BF D9 0E 9E 29 90 00 E8 C9 | ok | 99001264 | 99010640 | Rdr |03 00 B2 02 1C 00 AD EA | ok | 99050980 | 99059172 | Tag |05 D5 07 90 07 CA 51 | ok |

We are using:

mode 05

sens_res 0403

sel_res 20

Uid 123456

Nfcid 047500e0008002000000

General empty

Historical empty

Kind regards

Sander

Re: PN532 sends unknown command

jimmychan — Sun, 20 Jul 2025 07:57:29 GMT

PN532 is not recommended for new design. I would suggest PN7160 Plug-n-Play NFC Frontend with Integrated Firmware | NXP Semiconductors..

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PN532 sends unknown command

Re: PN532 sends unknown command