Tag Programming
35
Programming the ISO18000-6A Tag
Both the
Wa
and
Wt
command can be used with the ISO18000-6A tag. In addition to
Wa
and
Wt
, two additional commands can modify specific data in the tag. The
Wd
command
modifies the DSFID and
Wf
modifies the AFI.
Typically, the
Wt
command is used to modify user data in the tag. The
Wt
,
Wd
, and
Wf
commands require the tag ID to be in the
d:
parameter. Also, the tag must first be put in
the SELECT state using the
Ts
command with the tag ID specified in the
d:
parameter.
NOTE:
Some varieties of ISO18000-6A tags are not writeable. Check with your tag vendor
to verify if your tag supports write operations.
The format of the
Wa
command is as follows:
}Wa,a:<blk addr>,b:<blk data>[,l:<# blks>]!
where:
a:<blk addr>
. In ISO18000-6A, only a single block can be written at one time
and this parameter represents the specific four byte block.
l:<# blks>
. This parameter is optional since each write operation must contain
exactly four bytes.
b:<blk data>
. This parameter must contain four bytes of data.
The following is a typical command to write to an ISO18000-6A tag:
}wa,a:0,b:01020304!
For example, to write
AABBCCDD
to address
0x20
on a tag with ID
E00300001122334455667788
, issue the following command:
}wt,d:E00300001122334455667788,a:20,b:AABBCCDD!
In addition to the
Wa
,
Wt
,
Wd
, and
Wf
commands, SAMSys readers also support the
following EPC1 operations:
•
Lb
Lock Block
•
Yl
Query Lock Status (returns
f:0
for unlocked or
f:1
for locked)
Each of these operations must specify a particular tag ID using the
d:
parameter or first be
put in the
SELECT
state using the
Ts
command with tag ID specified in the
d:
parameter.
Summary of Contents for MP9311 Series
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