LRI512 datasheet(28/54 Pages) STMICROELECTRONICS

28 / 54 page

LRI512

28/54

INVENTORY

Command Code = 0x01

When receiving the Inventory request, the LRI512

performs

the

anti-collision

sequence.

The

Inventory_flag shall be set to 1. The Meaning of

Flags 5 to 8 is according to Table 13., Request

Flags 5 to 8 when Bit 3 = 1, on page 20. The Re-

quest (Table 21) contains:

– Flags,

– Inventory Command code

– AFI if the AFI flag is set

– Mask Length

– Mask Value

– CRC

The Response (Table 22) contains:

– Flags

– DSFID (always 00h)

– Unique ID

Note on Inventory Operation. In

the

current

LRI512 device, it is not possible to use the full

range of Mask Length capability to covert the com-

plete INVENTORY sequence. Values above the

ones mentioned are not allowed:

– 16 slots mode (Request flag b6=0): Mask

Length must be in the range 0 to 27.

– 1 slot mode (Request flag b6=1): Mask

Length must be in the range 0 to 20.

STMicroelectronics programs the UID in such a

way that it guarantees that the anti-collision se-

quence is able to detect all LRI512 in the reader

field.

Table 21. Inventory Request Format

Table 22. Inventory Response Format

Request

SOF

Request

Flags

Inventory

Optional AFI

Mask Length

Mask Value

CRC16

Request

EOF

8 bits

0x01

8 bits

0 - 64 bits

16 bits

Response

SOF

Response

Flags

DSFID

UID

CRC16

Response

EOF

8 bits

0x00

64 bits

16 bits

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