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7.4.6 Transparent ISO14443-4 Transponder Access
„t‟
This command is used to communicate with ISO14443-4 Type A/B compatible transponders. Data
passed as argument is forwarded to the transponder, any response received is transmitted to the host
as answer.
The transponder must be selected prior further data access. Basic communication parameters like
communication timeout and maximum frame size are negotiated by the reader with the card
automatically; this means the commands RATS (ISO14443A) and ATTRIB (ISO14443B) are part of
the selection process. The maximum allowed frame size is 40 bytes.
The passed data must comply with ISO14443-4 data framing. For details regarding the Mifare®
DESFire command set, please contact NXP Semiconductors in order to receive the appropriate
documentation.
Command:
‘t[DataLength][0F][ISO14443-4 Frame]’
Answer
Answer
Description
‘Response<CR><LF>’
ISO 14443-4 compliant response from transponder
‘N<CR><LF>’
Error: No response from transponder
Example
Command
Description
t020FABCD
Sends two bytes
ABCD
to the transponder, received data will be forwarded to the host.