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 21 of 100
6.1.5.3. Get Card Presence
This checks the presence of the inserted card.
Command Format
Response Data Format
Offset Field Size Value Description
0 bMessageType 1 14h -
1 LEN1 LEN2 (wLength) 2 0200h
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
3 STA 1 -
Card Status:
00 = Unknown status
01 = No card present
02 = Card present but inactive
03 = Card present and active
4 CSUM (wChecksum) 1 -
CSUM means the XOR values of all
bytes in the command
Response Data Format (Error)
Offset Field Size Value Description
0 bMessageType 1 94h -
1 LEN1 LEN2 (wLength) 2 0200h
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.
3 Error Code (bErrorCode) 1 - Error Code. Refer to Appendix A
4 CSUM (wChecksum) 1 -
CSUM means the XOR values of all
bytes in the command
Example:
Request = 65 01 00 64
Response = 14 02 00 03 15
Offset Field Size Value Description
0 bMessageType 1 65h -
1 LEN1 LEN2 (wLength) 2 0100h
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
3 CSUM (wChecksum) 1 64h
CSUM means the XOR values of all
bytes in the command