Advanced Card Systems Limited ACR1281S Benutzerhandbuch
ACR1281S
Advanced Card Systems Ltd.
Page 45 of 56
2.5.2 Read Value Block
The “Read Value Block command” is used for retrieving the value from the value block. This
command is only valid for value block.
Table 2.5.2-1a: Read Value Block APDU Format (5 Bytes)
command is only valid for value block.
Table 2.5.2-1a: Read Value Block APDU Format (5 Bytes)
Command
Class
INS
P1
P2
Le
Read Value
Block
Block
FF
B1
00
Block
Number
00
Block Number (1 Byte):
The value block to be accessed.
Table 2.5.2-1b: Read Value Block Response Format (4 + 2 Bytes)
Response
Data Out
Result
Value
{MSB .. LSB}
SW1
SW2
Value (4 Bytes):
The value returned from the card. The value is a signed long integer (4 bytes).
E.g. 1: Decimal –4 = {0xFF, 0xFF, 0xFF, 0xFC}
Value
MSB
LSB
FF
FF
FF
FC
E.g. 2: Decimal 1 = {0x00, 0x00, 0x00, 0x01}
Value
MSB
LSB
00
00
00
01
Table 2.5.3-1c: Read Value Block Response Codes
Results
SW1
SW2
Meaning
Success
90
00
The operation is completed
successfully.
successfully.
Error
63
00
The operation is failed.