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
Card Commands
The available commands and the parameters specified in the card commands as well as the data transmitted in the response
from the ACR38 depend on the selected card type.
MCU-based Card
RESET_WITH_5_VOLTS_DEFAULT
This command powers up the card inserted in the card reader and performs a card reset. If the card is powered up when the
command is being issued, only a reset of the card is carried out. The power supply to the card is not switched off.
Command format
Header
Instruction
Data length
LEN
01
H
80
H
00
H
00
H
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.
RESET_WITH_SPECIFIC_VOLTAGE
This command powers up the card inserted in the card reader and performs a card reset. If the card is powered up when the
command is being issued, only a reset of the card is carried out. The power supply to the card is not switched off.
Command format
Header
Instruction
Data length
Data
LEN
01
H
80
H
00
H
01
H
Data
=
00
H
for automatic voltage detection
=
01
H
for 5-volt card
=
02
H
for 3-volt card
=
03
H
for 1.8-volt card
ACR38 Reference Manual
Version 2.2 January 2008
Page
15
of 44