ACS ACR1255U-J1, Reference Manual

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ACR1255U-J1 – Reference Manual
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5.7.6. RDR_to_SPH_ACK (Error handling)
This is an error handling acknowledgement message sent by the ACR1255U-J1 to the paired device
to recognize the acceptance of some command messages. During the communication, any indicated
error message will be transmitted using the RDR_to_SPH_ACK. The command is not encrypted.
Command Mode supported Sender Description
51h Connected, Authenticated Reader
RDR_to_SPH_ACK (Error
handling)
This message will also include the error code whenever appropriate.
Offset Field Size Value Description Encrypted
0 bMessageType 1 51h Error handling response header
No
1 LEN1LEN2 (wLength) 2 00h -
3 Slot Number 1 00h -
4 Sequence 1 00h -
3 bErrorCode 1
Specify the error code for the
previously processed command
message. The possible error
codes are listed in as the table
below.
4 wChecksum 1
CSUM means the XOR values
of all bytes in the command
Field Value Description
bErrorCode
01h Checksum error
02h Timeout
03h Command error
04h Unauthorized
05h Undefined error
06h Received data error
Table 9 : Mutual Authentication Error codes