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6.0. Pseudo-APDUs
Pseudo-APDUs are used for the following:
•
Exchanging Data with Non-PC/SC Compliant Tags.
•
Retrieving and setting the reader parameters.
•
The Pseudo-APDUs can be sent through the "ACR122U PICC Interface" if the tag is already
connected.
•
Or the Pseudo-APDUs can be sent by using "Escape Command" if the tag is not presented
yet.
6.1. Direct Transmit
This is the Payload to be sent to the tag or reader.
Direct Transmit Command Format (Length of the Payload + 5 Bytes)
Command
Direct
Transmit
Where:
Lc:
1 Byte. Number of Bytes to Send
Maximum 255 bytes
Data In:
Response
Direct Transmit Response Format
Response
Direct Transmit
ACR122U – Application Programming Interface
Version 2.02
Class
INS
P1
0xFFh
0x00h
0x00h
Data Out
Response Data
P2
Lc
Data In
Number
0x00h
of Bytes
Payload
to send
Page 21 of 47
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