User Guide

Gen2 Tag Commands
114
password on each using Write Tag Data (24h) as an embedded command:
This command will inventory all tags with an EPC value ending in 0x34, which requires
adding the appropriate Tag Singulation Fields
to the Basic Tag Inventory syntax then will use
Write Tag Data (24h)
to write 0x12345678 into the Reserved Memory Bank starting at
Word address 0x00000002 (Access Password)
The response contains the number of tags found matching the Select criteria specified
and the number of embedded command operations which succeeded and failed. Use Get
Tag Buffer (29h) to access the tag EPCs and Tag Read Meta Data for the Tags Found.
Tags in the buffer may or may not have had successful execution of the embedded
command on them:
Note
Depending on the Gen2 Session/User Mode used the Operations
Succeeded/Failed counts can be misleading since in Session 0, for
example, the tag may respond many times during an inventory round and
the command may be attempted many times. This would result in counts
higher than the actual number of tags the operation succeeded or failed on.
The above commands were run in User Mode = Portal.
Write Tag EPC (23h)
The Write Tag EPC command takes the following data elements:
FF 1E 22 04 00 04 03 E8
00 00 00 00 00 00 00 78 08 34
SOH Length OpCode Options
(EPC Mem)
Search
Flags
Timeout Access Password Select Data Address
(bits)
Select
Data
Length
(bits)
Select
Data
01 0C 24
03 E8
00 00 00 00 02 00 12 34 56 78
?? ??
Embd
Cmd
Count
Embd
Cmd
Length
Embd
Cmd
OpCode
Embd Cmd
Timeout
(Not Used)
Embd
Cmd
Options
(Must be
0x00)
Write Address (Words) Write
Mem-
Bank
Write Data CRC
FF 0A 22 00 00 04 00 04 03 01 24 00 03 00 00 ?? ??
SOH Length OpCode Status Options Search Flags Tag
Found
Embd
Cmd
Count
Embd
Cmd
OpCode
Operations
Succeeded
Operations
Failed
CRC