A C R 3 8 S m a r t C a r d R e a d e r / W r i t e r
Response data format
Header
Status
Data length
ATR
LEN
01
H
………
ATR
Answer-To-Reset as transmitted by the card according to ISO7816-3.
NOTE -
The ATR is only returned in the ACR38 response if the communication protocol of the card is
compatible with the reader, i.e., if the card can be processed by the ACR38. Otherwise, the ACR38 returns
an error status and deactivates the smart card interface.
POWER_OFF
This command powers off the card inserted in the card reader.
Command format
Header
Instruction
Data length
LEN
01
H
81
H
00
H
00
H
Response data format
Header
Status
Data length
LEN
01
H
EXCHANGE_TPDU_T0
To exchange an APDU (Application Protocol Data Unit) command/response pair between the MCU card inserted in the ACR38
and the host computer.
Command format
Header
Instruction
Data length LEN
Data
MSB
LSB
T0 TPDU
01
H
A0
H
………
LEN
Length of APDU command data, N
Data
T0 TPDU to be sent to the card
Case 1: CLA INS P1 P2
Case 2: CLA INS P1 P2 Le
Case 3: CLA INS P1 P2 Lc Data
Case 4: Not supported. The driver/application should break case 4 command into case 3 +
case 2 commands.
ACR38 Reference Manual
Version 2.2 January 2008
Page
16
of 44
