User's Manual

ACR1281U
 Advanced Card Systems Ltd. Page 36 of 81
2.5 Value Block Related Commands
The data block can be used as value block for implementing value-based applications.
2.5.1 Value Block Operation
The “Value Block Operation command” is used for manipulating value-based transactions. E.g.
Increment a value of the value block etc.
Table 2.5.1-1a: Value Block Operation APDU Format (10 Bytes)
Command Class INS P1 P2 Lc Data In
Value Block
Operation
FF D7 00 Block
Number
05 VB_OP VB_Value
(4 Bytes)
{MSB .. LSB}
Block Number (1 Byte):
The value block to be manipulated.
VB_OP (1 Byte):
0x00 = Store the VB_Value into the block. The block will then be converted to a value block.
0x01 = Increment the value of the value block by the VB_Value. This command is only valid for
value block.
0x02 = Decrement the value of the value block by the VB_Value. This command is only valid for
value block.
VB_Value (4 Bytes):
The value used for value manipulation. The value is a signed long integer (4 bytes).
E.g. 1: Decimal –4 = {0xFF, 0xFF, 0xFF, 0xFC}
VB_Value
MSB LSB
FF FF FF FC
E.g. 2: Decimal 1 = {0x00, 0x00, 0x00, 0x01}
VB_Value
MSB LSB
00 00 00 01
Table 2.5.1-1b: Value Block Operation Response Format (2 Bytes)
Response Data Out
Result SW1 SW2
Table 2.5.1-1c: Value Block Operation Response Codes
Results SW1 SW2 Meaning
Success 90 00 The operation is completed
successfully.
Error 63 00 The operation is failed.