Omron V680S-HMD63-PNT User Manual page 96

Section 6
Functions
 Normal RF Tag Communications
The commands in the following table perform communications with RF Tags.
Name
READ DATA
WRITE DATA
READ ID
DATA FILL
LOCK
COPY DATA
 Tag Memory Management
 RF TAG OVERWRITE COUNT CONTROL Command
The RF TAG OVERWRITE COUNT CONTROL command is used to determine whether the RF Tag
overwrite limit has been exceeded.
• With the RF TAG OVERWRITE COUNT CONTROL command with a subtraction specification, the
overwrite count is subtracted from the data in the user-specified overwrite count control area to
determine whether the number of overwrites has been exceeded.
• With the RF TAG OVERWRITE COUNT CONTROL command with an addition specification, the
overwrite count is added to the data in the user-specified overwrite count control area to determine
whether the number of overwrites has exceeded 100,000. The RF TAG OVERWRITE COUNT
CONTROL command with an addition specification is used only for RF Tags with a overwrite life of
100,000 writes.
Overwrite count control area
RF TAG OVERWRITE COUNT CONTROL Command with a Subtraction Specification
The overwrite count control area consists of 4 bytes from the specified start address. The decrement
value is subtracted from the overwrite count and then written to this area. When the value reaches 0
(i.e., 00 hex), a warning code is returned. Therefore, to enable control of the number of overwrites,
the maximum number of overwrites must be written to the overwrite count control area beforehand.
You can set any number of overwrites up to 16,700,000.
You can read the overwrite count control area with a read command. If the control area data is
already 0, the control area value will not be refreshed, and a warning code will be returned as a
response. When the refresh count is set to 0000 hex, the count will not be updated, and only an
overwrite count check will be performed.
RFID System
94
User's Manual
(PROFINET)
Reads data from an RF Tag.
Writes data to the memory of the RF Tag.
Reads the RF Tag's ID code.
Writes the specified data to the specified number of words beginning from the specified start
address. The specifications are made in the command.
Locks the specified memory block in the RF Tag. It will no longer be possible to write data to the
locked memory block. The lock cannot be released.
Reads data from the memory of an RF Tag using one Reader/Writer (A) and writes it to the
memory of the RF Tag in the communications field of another Reader/Writer (B).
Description
Always 00 hex
Upper digit
Middle digit
Lower digit
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