Hi,
During the ISO14443-3 Initialisation and anti-collision phase, the tag indicates the support of ISO14443-4 in the Select acknowledge (SAK). The coding of the SAK is the following :
b8 b7 b6 b5 b4 b3 b2 b1
X X 1 X X 0 X X tag compliant with ISO/IEC 14443-4
X X 0 X X 0 X X tag ***not*** compliant with ISO/IEC 14443-4
If the tag is compliant with ISO/IEC 14443-4, the reader can then start the ISO/IEC 14443-4 (aka ISO DEP) communication protocol layer. The reader will send a Request for Answer To Select (RATS) and the tag will reply with an Answer To Select with its bit rate capability. Then the reader can send a Protocol and Parameter Selection request (PPS) to change the bit rate. The related API are rfalIsoDepRATS and rfalIsoDepPPS.
But the first step is to check bit #6 of the SAK in the datasheet of the tag. If bit #6 equals 0, there is no chance to have the tag supporting RATS and other ISO14443-4 commands. What is the value of the SAK of your tag?
Rgds
BT
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