User's Manual

V740 RFID READER/WRITER, ANTENNA 2005-07, REV.01
OPERATION MANUAL
29 of 45 ©OMRON CORPORATION 2005
2.2.4.2 ID Write
The UPDATE command is used to write new data to a
tag. This can be used to write a new tag_id. The
structure of an UPDATE command is as follows:
UPDATE table_expression set_specification
where_specification;
table_expression and entries specified in
set_specification are provided in Table 3.
A table_expression is specified by only one table
name:
UPDATE tag_id
A set_specification is entered as:
SET entry=value
A where_specification is entered as:
WHERE boolean_expr
In a where_specification, both protocol_id and
antenna_id must be specified.
The tag_id (tag data) is returned with a check code as
follows:
EPC0: [id][check_code]<LF><LF>
EPC1:[check_code][tag_id]<LF><LF>
The 'where_specification' is specified in the same
manner as the SELECT in the previous section.:
• Example : To write tag data(tag_id) a 64-bit EPC
tag:
UPDATE tag_id SET id=0x1234567890ABCDEF
WHERE protocol=’EPC1’ AND antenna_id=1;
The reader returns the tag_id if the write operation
was successful.For example the response is as
follows:
0xCE851234567890ABCDEF<LF><LF>
In this case, “CE85” is the check code.
“1234567890ABCDEF” is tag data(tag id).
If the operation is failed, "Error 0102: Error
performing query<LF><LF>" returend.
Note: The format of the tag data in the command
must much the selected protocol or an error will result.
For example :
- A 64 bit EPC1 tag requires 16 hexadecimal digits
- A 96 bit EPC1 tag requires 24 hexadecimal digits
(See section 1.6)
If wrong data is written to the tag, the tag may be
unreadable. In this case, write correct tag ID again,
after that, the tag would turn to be readable.