User Guide

Table Of Contents
Multi-Protocol Tag Commands
51
Using the start and end index method does not affect the read index that is internally
stored in the module. The above request returns a message with two tags. The length of
each tag EPC record returned is defined based on the max EPC length configured with
Set Reader Configuration(9Ah)
, regardless of the size of a specific tag’s EPC. The sizes
and fields of the EPC portion of a tag buffer entry is defined in the Tag Buffer Entry
table.
For example:
A 64-bit tag has the length set to 0x60 (16-bit PC + 64-bit tag EPC + 16-bit tag CRC),
but only the first 12 bytes of the tag record is filled in, the trailing bytes, after the CRC
are padded with zeros.
An 96-bit GEN2 tag, the length is 0x80 (16-bit PC (Protocol Control) word + 96-bit tag
EPC + 16-bit tag EPC CRC).
In the response below, two tag EPCs are returned. Tag #1 is a 96-bit EPC tag and tag #2
is a 64-bit EPC tag.
Note
Using this syntax the number of tags in the response is not specified. It must
be determined by the message length.
FF 04 29 00 01 00 03 CC 94
SOH Length OpCode Start Idx End Idx CRC
FF 24 29 00 00
SOH Length OpCode Status
00 80 30 00 11 11 22 22 33 33 44 44 55 55 66 66 18 35
EPC
Length
PC W o r d Ta g E PC Tag C R C
00 60 20 00 11 11 22 22 33 33 44 44 C2 41 00 00 00 00
EPC
Length
PC Word Tag EPC Tag CRC Padding
D3 32
CRC