Advanced Card Systems Ltd. ACR3901T-W1, Reference Manual

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ACR3901T-W1 – Reference Manual
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Version 1.02
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Page 36 of 100
6.1.6.6. RDR_to_SPH_DataRsp
This command is sent from the reader to the paired device after a successful mutual authentication.
In Bluetooth mode, the communication protocol from Card Power On to Card Set Parameters will be
encrypted and transmitted after a successful mutual authentication.
Offset Field Size Value Description Encrypted
0 bMessageType 1 22h - No
1
LEN1 LEN2
(wLength)
2 -
The number of extra bytes
starting from the next field for
this message, and is expressed
in two bytes long, and LEN1 is
LSB while LEN2 is MSB
No
3 abEncryptedData N*16 -
Each 16 bytes of data will be
encrypted with the Session Key
using AES128 CBC cipher
mode
Yes
3 + N*16 wChecksum 1 -
CSUM means the XOR values
of all bytes in the command
No