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Application Tag Commands

Command Set 83

Read Tag Single (21h)

For deprecated version (including non-Gen2 protocol specific syntax) of this command

see Appendix D: Read Tag Single (21h)

The Read Tag Single command will search for a tag for the specified timeout or a single

tag is found, whichever comes first. The search criteria is specified using the Tag

Singulation Fields. If Option=0x00 is specified it will return with the first tag it finds,

otherwise it will only return Success and the found EPC if a tag matching the specified

criteria is found. If no tag is read, a fault code is returned.

In addition to the Tag Singulation Fields the basic Read Tag Single command takes a 16-

bit timeout value in milliseconds. The command will return after a tag is found or the

timeout expires, whichever happens first.

The basic syntax which returns only the tag EPC is defined in Get Tag EPC

. With

additional Option bits set Read Tag Single can also return Tag Read Meta Data

using the

syntax in Get Tag EPC and Meta Data

Note

Read Tag Single will always use Gen2 Q=0 when Get Protocol Configuration

(6Bh) Q Value set to Dynamic Q. For use with large tag populations a Static Q

appropriate for the population should be used to avoid collisions.

Get Tag EPC

The following example shows a search requesting a tag matching the following criteria for

a max timeout of 1000 ms. This example uses the Tag Singulation/Select Functionality

with

Option=0x03, indicating Tag Selection based on the contents of User Memory,

specifically:

Memory Bank = User Memory.

Starting Address = bit 32

Select Data = 0x1234

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