ACS AET65 Smart Card Reader with Fingerprint Sensor - Manual (Page 12)

00H = command successfully executed
Otherwise = error in command data, or command cannot be executed
A table listing the possible values of the status byte and the corresponding
meaning is given in Appendix B.2.
Data Length Number of subsequent data bytes, and is encoded in 2 bytes. The first byte
(MSB) and second byte (LSB) represent data length N.
Data Data contents of the command.
For a READ_DATA command, for example, the data bytes would contain the
contents of the memory addresses read from the card. The data bytes can
represent values read from the card and/or status information.
Note: Responses are sent from AET65 to the host computer through BULK IN endpoint.
8.1.3. Card Status Message
When a card is being inserted into the reader or an inserted card is being removed from the reader
while the reader is idle, i.e., not executing a command, the reader transmits a Card Status Message to
notify the host computer of the change in the card insertion status.
The Card Status Messages have the following structure and contents:
Card Status Message for Card Insertion
Byte 1 2 3 4
Header Status Data Length
01 H C1 H 00 H 00 H
Card Status Message for Card Removal
Byte 1 2 3 4
Header Status Data Length
01 H C0 H 00 H 00 H
A card status message is transmitted only once for every card insertion or removal event. The reader
does not expect an acknowledge signal from the computer. After transmitting a status message, the
reader waits for the next command from the computer.
Note: Card status messages are sent from AET65 to the host computer through INTERRUPT IN
endpoint.
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AET65 Reference Manual
Version 1.00
Page 12 of 19
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