ACS AET62 NFC Reader with Fingerprint Sensor - Manual (Page 17)

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)
Block Number (1 Byte): The value block to be accessed.
Response Data Out
Result
Value
{MSB ..
LSB}
SW1 SW2
Table 25: Read Value Block Response Format (4 + 2 Bytes)
Value (4 Bytes): The value returned from the card. The value is a signed long integer (4
bytes).
Example 1: Decimal –4 = {0xFF, 0xFF, 0xFF, 0xFC}
Value
MSB LSB
FF FF FF FC
Example 2: Decimal 1 = {0x00, 0x00, 0x00, 0x01}
Value
MSB LSB
00 00 00 01
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