Pseudo Apdus - ACS ACR122 Series Application Programming Interface

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Pseudo APDUs

PSCS interface is used for exchanging APDUs and Responses between the PC and Tag. The
ACR122U will handle the required protocol internally. ACR122U comes with two primitive
commands for this purpose.
Direct Transmit
To send an APDU (PN532 and Contactless Commands), and the length of the Response Data will
be returned.
Table 1.0A: Direct Transmit Command Format (Length of the PN532_Contactless Command + 5
Bytes)
Command Class
Direct 0xFF
Transmit
Lc: Number of Bytes to Send (1 Byte)
Maximum 255 bytes
Data In: PN532_Contactless Command
The data to be sent to the PN532 and Contactless Tag.
Table 1.0B: Direct Transmit Response Format (2 Bytes)
Response
Result
Data Out: SW1 SW2
Status Code returned by the reader.
Table 1.0C: Status Code
Results
Success
Error
Time Out
Error
ACR122U Application Programming iInterface
Version 1. 0 January 2008
ACR122 NFC Contactless Smart Card Reader
INS P1
0x00 0x00
Data Out
SW1 SW2
SW1 SW2
61 LEN The operation is completed
successfully. The response data has a
length of LEN bytes.
The APDU "Get Response" should
be used to retrieve the response data.
63 00 The operation is failed.
63 01 The PN532 does not response.
P2 Lc
0x00 Number PN532_Contactless
of Bytes
to send
Meaning
Data In
Command
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