MP9311 User’s Guide
42
Programming the Matrics Class 0+ Tag
Matrics Class 0+ tags utilize a process called Singulation. This is a process of uniquely
identifying a tag in a population of tags and retieving its Electronic Product Code (EPC).
For detailed information on EPC Class 0 singulation, refer to the EPC Global Class 0
specification.
When a tag is requested to identify itself, it responds with different data based on its
singulation mode. Class 0 and Class 0+ tags allow three modes of singulation:
•
ID2 - This mode responds directly with the EPC. ID2 is the fastest mode (fewest bits
transmitted), but requires the reader to echo the bits back to the tag. This echo can
create security issues. Also, this mode can not be read when writing the EPC, since the
echo will change the EPC as you write it.
•
ID0 - This mode returns packets of 12 random bits that are different every time you
singulate. When the reader has what it determine is the correct number, it writes the
EPC. This mode is the only reliable method of singulation during writing the tag EPC.
•
ID1 - This mode is the same as ID0, but every singulation returns the same bit stream.
The bits are random, but they are seeded from the EPC. Writing the EPC changes
these bits.
The singulation mode is controlled with the PE0 register and must be set prior to writing
tags.
Matrics Class 0+ tags contain three writable pages or memory blocks: These pages are as
follows:
•
Page 0 – Kill code (24 bits)
•
Page 2 – EPC code (64 or 96 bits)
•
Page 3 – User data (104 bits)
When Page 2 or Page 3 data is written, a 16-bit CRC is appended.
The
Wa
,
Wt
and
Wv
commands can be used to write Matrics Class 0+ tags. The
Wv
command is discussed at the end of this section.
The format of the
Wa
command is as follows:
}Wa,a:<blk addr>,b:<blk data>[,l:<# blks>]
[,d:<tag ID>]!
where:
a:<blk addr>
. This represents the
memory page
of the tag on which the write
operation will occur. Values can be 0, 2 or 3, as defined previously. If this parameter is
missing, it will default to 0.
l:<# blks>
. This parameter is required and is the number of bytes being written.
b:<blk data>
. This parameter is required and contains the data to write.
d:<tag ID>
. This parameter is required for the
Wt
command (optional for
Wa
) and
specifies the EPC code of the tag to which the write operation applies.
Summary of Contents for MP9311 Series
Page 1: ...User s Guide MP9311 Low Power UHF Reader Module THE POWER TO CHOOSE...
Page 6: ...MP9311 User s Guide iv...
Page 12: ...MP9311 User s Guide 6...
Page 34: ...MP9311 User s Guide 26...
Page 58: ...MP9311 User s Guide 50...
Page 59: ......
