ACS AET63 BioTRUSTKey - Manual (Page 11)

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.
Checksum The checksum is computed by XORing all response bytes including header, status
bytes, data length and all data bytes.
Note (*) : Please refer to “BioTRUSTKey API Manual.doc” for the descriptions of PTVerifySC
and PTVerifySCAll.
6.2.3. Transmission error
If the receiving party of a command (i.e., the AET63) or a response (i.e., the computer) detects an
error in the data length or the checksum of a command, it disregards the received data and sends a
"NOT ACKNOWLEDGE" message to the transmitting party upon completion of the faulty
transmission. The "NOT ACKNOWLEDGE" message consists of two bytes:
Byte 1 2
05
H
05
H
If the AET63 responds with a 'NOT ACKNOWLEDGE' message to a command from the computer, the
computer would normally transmit the command again. If the computer detects a transmission error in
a response from the AET63, it can send the 'NOT ACKNOWLEDGE' to the reader upon which the
reader will transmit the most recent response again.
6.3. 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.
In a system where these unsolicited messages from the reader to the computer are not desired, they
can be disabled with the SET_NOTIFICATION command. Please note that the setting made with this
command is volatile and will be lost with the next reader reset or power up. By default, the Card
Status Message will be transmitted by the reader after a reset.
The Card Status Messages have the following structure and contents:
Card Status Message for Card Insertion
Byte 1 2 3 4 5
Header SW1 SW2 Data
length
Checksum
01
H
FF
H
01
H
00
H
FF
H
Card Status Message for Card Removal
Byte 1 2 3 4 5
Header SW1 SW2 Data
length
Checksum
01
H
FF
H
02
H
00
H
FC
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.
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Document Title Here AET63 Reference Manual
Version 2.2
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