MP9311 User’s Guide
32
Overview of the Tag Writing Commands
Tag writing with SAMSys readers is performed using the Write Any (
Wa
), Write Tag (
Wt
),
and Write Verify (
Wv
) commands
Wa
must be used when writing to blank tags.
Wt
is used
when the tag already has a tag ID.
Wv
is a multifunction command that performs any erase,
write, and verification needed to program a tag in a specific protocol. This command can
also lock the data. A general guideline for using each write command is as follows:
Wa
is used whenever the write operation affects the tag ID.
Wa
can also be used for write
operations to any data on a tag. This command is executed with a single tag in the RF
field.
Wt
can only be used for write operations to a specific tag where the tag ID has already
been assigned. This command can be used for write operations to any data on the tag,
except the tag ID itself.
Wv
can be used for most protocols. However, it is typically used for EPC protocols that
require multiple actions such as erasing the tag prior to writing and then locking the data.
Some tags support the ability to have a portion or all of their internal memory locked
against further modification. Write operations to locked memory will not be successful.
The locked status of a piece of memory can be queried via the
Yl
command. The
Yl
response is
f:0
for unlocked or
f:1
for locked.
Details of the syntax for any command found in this document can be obtained in the
CHUMP Reference Guide.
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