ACS ACK30 Smart Keyboard - Manual (Page 30)

ACR30 Reference Manual
Version 3.3 January 2009 Page 30 of 44
ACR30
Command format
Instruction
Code
Data
length
80
H
00
H
Response data format
ATR
ATR Four bytes Answer-To-Reset read from the card.
The ATR bytes are read from the card with LSB first, i.e., the first bit read from the card is
the LSB of the first ATR byte.
9.2.3.2. 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
9.2.3.3. READ_DATA (*)
To read the specified number of bytes from the specified address of the card inserted.
Command format
Instruction
Code
Data
length
Data
ADDR LEN
90
H
03
H
ADDR Byte address of first byte to be read from the card. The high byte of the address is
specified as the first byte of ADDR.
LEN Number N of data bytes to be read from the card (0 < N
≤ MAX_R)
Response data format
BYTE
1
BYTE
2
BYTE
3
... BYTE
N
PROT
1
... PROT
L
BYTE x Data bytes read from the card memory
PROT y Bytes containing the protection bits of the data bytes read
(0...4 bytes)