ACR122T – Application Programming Interface
Version 2.02
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Page 21 of 45
6.0. Pseudo APDUs
Pseudo APDUs are used for the following:
•
Exchanging Data with Non-PCSC compliant tags.
•
Retrieving and setting the reader parameters.
•
The Pseudo APDUs can be sent through the “ACR122T 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 P 5 Bytes)
Command
Class
INS
P1
P2
Lc
Data In
Direct
Transmit
0xFFh
0x00h
0x00h 0x00h
Number
of Bytes
to send
Payload
Where:
Lc:
1 Byte. Number of Bytes to Send
Maximum 255 bytes
Data In:
Response
Direct Transmit Response Format
Response
Data Out
Direct Transmit
Response Data
