V740 RFID READER ANTENNA
NOTE. SPECIFICATIONS SUBJECT TO CHANGE WITHOUT NOTICE. REV. 1.1
OPERATION MANUAL
16 of 27
© OMRON CORPORATION 2004
Table RQL-1
Parameters/Constraints RQL Query
Meaning
Read ()
SELECT id FROM tag_id
Reads a tag’s id
Write (new_id)
UPDATE tag_id SET id=0x1234
Gives a tag a new
id
ID
Lock
(locked)
UPDATE tag_id SET locked=1
Locks a tag
Kill
(id, password, killed)
UPDATE tag_id SET killed=1 WHERE
id=0x1234 AND password=0x1234
Kills a tag
Password (new_password)
UPDATE tag_id SET
password=0x1234
Sets the password
of a tag
Read (id,
blocknum)
SELECT data FROM tag_data
WHERE id=0x1234 AND
blocknum=12
Reads raw data
from a matching
tag
Write (id, new_value, blocknum)
UPDATE tag_data SET data=0x1234
WHERE id=0x1234 AND
blocknum=12
Writes data to a
specific tag and
memory block
Data
Lock
(id, addr, blocknum)
UPDATE tag_data SET locked=1
WHERE id=0x1234 AND
blocknum=12
Locks a block of
memory
With the exception of the ‘ID Read’ command, all
commands are protocol and antenna specific and can
only be used with a single protocol at a time and with
a single antenna at a time. Hence all queries with the
exception ‘ID Read’ need to be constraint to one
protocol and one antenna using, for example
WHERE protocol_id=’CC915’ and
antenna_id=1
A complete example of a complete ‘ID Write’ query
would be
UPDATE tag_id SET
id=0x0123456789ABCDEF WHERE
protocol_id='CC915' AND antenna_id=1.
‘ID Read’ (enumerate tags) is, by definition, a multi-
target command, since it determines what the
individual targets are in the first place.
There are some special cases to the single-target
rule. For example, ID Write is semantically tricky –
what does it mean to target a tag if its target ID is
going to be changing? In the current state of the art,
most protocols do not support addressed ID writes (ID
write targets all tag IDs) or disallow tag ID changes
entirely.
