User Guide

Gen2 Tag Commands
115
Read Tag Multiple Embedded Command Fields
Here is an example request and response showing the use of
Tag Singulation/Select
Functionality to inventory tags which meet a specific criteria and then setting the Access
Field Value Description
Select Options [1 byte]
The Options value of the Tag Singulation Fields
Search Flags [2 bytes]
Bit 3 of the Read Tag Multiple Search Flags must be set
indicating this request contains embedded command(s).
Timeout [2 bytes] Indicates how long the command should spend searching
AND performing the embedded command. It may be desir-
able to specify a longer timeout if a large number of tags
are likely to get the embedded command executed on
them.
Access Password [4 bytes] The Access Password of the tags expected to be invento-
ried, if they are locked. If the tags are not locked specify
0x00000000.
Note: If inventoried flags are locked and have
different passwords, only tags with matching
passwords will get a successful execution of
the embedded command.
Tag Singulation Fields
The remaining, appropriate fields depending on the value
of Select Options.
Embedded Command Count [1 byte] The number of embedded commands to follow. [Currently
only supports one]
Embedded Command Length [1 byte] Length of embedded commands. Follows standard Length
value calculation: number of bytes after OpCode.
Embedded Command
OpCode
[1 byte] The OpCode of the embedded command. Currently sup-
ports:
• Write Tag Data (24h)
• Lock Tag (25h)
• Kill Tag (26h)
• Read Tag Data (28h)
The fields and values required by the embed-
ded command.
Note: The embedded commands do not support Tag
Singulation as it is already performed during
the inventory operation. The Options field for
the embedded command must be 0x00.
Note: The Timeout field for embedded commands
must be 0x0000.