ACS ACK30 Smart Keyboard - Manual (Page 37)

ACR30 Reference Manual
Version 3.3 January 2009 Page 37 of 44
ACR30
Response data format
ATR
ATR Answer-To-Reset as transmitted by the card according to ISO7816-3.
NOTE - The ATR is only returned in the ACR30 response if the communication protocol of the
card is compatible with the reader, i.e., if the card can be processed by the ACR30. Otherwise, the
ACR30 returns an error status and deactivates the smart card interface.
9.2.5.2. POWER_OFF
This command powers off the card inserted in the card reader.
Command format
Instruction Code Data length
81
H
00
H
Response data format
No response data
9.2.5.3. EXCHANGE_APDU
To exchange an APDU (Application Protocol Data Unit) command/response pair between the MCU
card inserted in the ACR30 and the host computer.
Command format
Instructi
on Code
Data
length
Data
LEN CLA INS P1 P2 Lc BYTE
1
...2 ... BYT
E N
Le
A0
H
LEN Length of APDU command data, N, + 6 (0 < N
≤ MAX_R)
CLA APDU instruction class byte
INS APDU instruction
P1 APDU parameter byte 1
P2 APDU parameter byte 2
Lc APDU command data length
BYTE x APDU command data
Le Expected APDU response data length (Le = 0 menas no data is expected from the card)
NOTE - With the T=0 communication protocol it is not possible to transmit data to the card
and from the card in a single command-response pair. Hence, only either Lc or Le can be greater than
0 in an EXCHANGE_APDU command when a T=0 card is in the reader. If both parameters have a
value greater than 0, the ACR30 does not execute the command and returns an error status.