ACS AET62, Reference Manual

Page: 16 / 37

AET62 Reference Manual
Version 1.0
Page 16 of 37
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6.5. Value Block Related Commands
The data block can be used as value block for implementing value-based applications.
6.5.1.
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.
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}
Table 21: Value Block Operation APDU Format (10 Bytes)
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).
Example 1: Decimal –4 = {
0xFF, 0xFF, 0xFF, 0xFC
}
VB_Value
MSB
LSB
FF FF FF FC
Example 2: Decimal 1 = {0x00, 0x00, 0x00, 0x01}
VB_Value
MSB
LSB
00 00 00 01
Response Data Out
Result SW1 SW2
Table 22: Value Block Operation Response Format (2 Bytes)
Results SW1 SW2 Meaning
Success 90 00 The operation completed successfully
Error 63 00 The operation failed.
Table 23: Value Block Operation Response Codes
6.5.2.
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.
Command Class INS P1 P2 Le
Read Value Block FF B1 00 Block Number 04
Table 24: Read Value Block APDU Format (5 Bytes)