XRAG2_08 datasheet(23/33 Pages) STMICROELECTRONICS

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XRAG2

XRAG2 command descriptions

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XRAG2 command descriptions

The XRAG2 offers Select, Inventory, and Access command sets as described in EPCglobal

Class 1 generation 2 RFID UHF specification, revision 1.0.9.

8.1

Select command set

8.1.1

Select

The XRAG2 supports the Select command as described in the EPCglobal Class 1

generation 2 RFID UHF specification, revision 1.0.9.

This command defines a tag population based on user-defined criteria for the next inventory

and access operations.

Readers can use one or more Select commands to select a particular tag population before

inventory.

8.2

Inventory command set

8.2.1

Query

The XRAG2 supports the Query command as described in the EPCglobal Class 1

generation 2 RFID UHF specification, revision 1.0.9.

This command initiates and specifies an inventory round. The Query command also

specifies the tag-to-reader data rate and coding scheme (FM0 or Miller).

8.2.2

QueryRep

The XRAG2 supports the QueryRep command as described in the EPCglobal Class 1

generation 2 RFID UHF specification, revision 1.0.9.

This command instructs tags participating in the inventory round to decrement their slot

counter. If slot=0 after decrementing, tag backscatters a 16-bit Random Number (RN16).

8.2.3

QueryAdjust

The XRAG2 supports the QueryAdjust command as described in the EPCglobal Class 1

generation 2 RFID UHF specification, revision 1.0.9.

This command increments, decrements or leaves unchanged the number of slots in the

inventory round without changing any other parameter of the round.

8.2.4

ACK

The XRAG2 supports the ACK command as described in the EPCglobal Class 1 generation

2 RFID UHF specification, revision 1.0.9.

This command acknowledges a single tag in the Reply state. The tag enters the

Acknowledged state and replies by backscattering its PC, EPC and CRC16.

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