Advanced Card Systems Limited ACR1281S Manuale Utente

ACR1281S

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Advanced Card Systems Ltd.

Page 44 of 56

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

Data In

Value Block
Operation

Block

Number

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

E.g. 2: Decimal 1 = {0x00, 0x00, 0x00, 0x01}

VB_Value

MSB

LSB

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

The operation is completed
successfully.

Error

The operation is failed.