ib technology

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The third argument specifies the destination block address where the incremented data is

stored. Note that source and destination blocks must be within same authenticated sector. The

four byte positive integer to add follows (least significant byte first).

B7

B0

Command:

0 1 0 0 1 0 0 1

(Ascii “I”, 0x49)

Argument1:

N N N N N N N N

(N = MF source block address 0 – 255)

Argument2:

T x x K K K K K

(T = Key Type, 0 = KeyA, 1= KeyB)

(K = Key code number, 0 – 31)

Argument3:

N N N N N N N N

(N = MF destination block address 0 – 255)

Argument4:

D D D D D D D D

(D = LS byte of integer to add)

Argument5:

D D D D D D D D

Argument6:

D D D D D D D D

Argument7:

D D D D D D D D

(D = MS byte of integer to add)

Acknowledge:

1 F F F F F F X

(F = Status flags)

Command to decrement integer within a Value Data Structure. The DEC Value command

operates as the INC command except the integer parameter is subtracted from the loaded

value. The first argument is the source block address to load data from, the second argument

specifies which key code and type to use for sector authentication (0-31 and if it is KeyA or

KeyB type). The third argument specifies the destination block address where the

decremented data is stored. Note that source and destination blocks must be within same

authenticated sector. The four byte positive integer to subtract follows (least significant byte

first).

B7

B0

Command:

0 1 0 0 0 1 0 0

(Ascii “D”, 0x44)

Argument1:

N N N N N N N N

(N = MF source block address 0 – 255)

Argument2:

T x x K K K K K

(T = Key Type, 0 = KeyA, 1= KeyB)

(K = Key code number, 0 – 31)

Argument3:

N N N N N N N N

(N = MF destination block address 0 – 255)

Argument4:

D D D D D D D D

(D = LS byte of integer to subtract)

Argument5:

D D D D D D D D

Argument6:

D D D D D D D D

Argument7:

D D D D D D D D

(D = MS byte of integer to subtract)

Acknowledge:

1 F F F F F F X

(F = Status flags)

Command to transfer (copy) Value Data Structure. The command loads the value from the

specified block address and then stores the result at the same or another block address. As

with INC and DEC commands the source block must have been formatted as a Value Block

beforehand and the block addresses must be within same authenticated sector.

4 byte integer

4 byte integer