ACR3901U-S1 – Reference Manual
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Version 1.09
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Page 37 of 96
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
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. It is expressed in
two bytes long. 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
