Omron V680S Series User Manual page 35

RF Tag Communications
 Communications Options
Communications with the RF Tag are performed according to one of the communications options that
are listed in the following table.
The setting of the communications option is effective immediately after it is changed. It is saved in
internal memory in the Reader/Writer even after the power supply is turned OFF.
Name
Once
Repeat
FIFO Repeat
 Once
The Reader/Writer communicates with RF Tags for command execution requests from the host device.
When the Reader/Writer is finished communicating with an RF Tag, it returns the communications
results to the host device and waits for another command.
If there is no RF Tag in the communications field when the Reader/Writer receives the command from
the host device, an RF Tag missing error will occur. It is therefore necessary to use a sensor or other
device to detect the presence of an RF Tag before you request command execution.
RF Tag
Reader/Writer
Host device Reader/Writer
Host device Reader/Writer
Reader/Writer RF Tag
RF Tag operation
When the Reader/Writer receives a command, it communicates with an RF Tag and returns a
response.
When the Reader/Writer receives a command, it repeatedly communicates with RF Tags and
returns a response when communicating with an RF Tag was possible. Once an RF Tag has been
communicated with, communications will not be performed for it again as long as it remains in the
communications field.
When the Reader/Writer receives a command, it repeatedly communicates with RF Tags and
returns a response when communicating with an RF Tag was possible.
After communicating with an RF Tag once, operation for that RF Tag is stopped. When the Reader/
Writer communicates with an RF Tag, there must be only one RF Tag for which operation is
possible in the communications field. The Reader/Writer will not communicate with the same RF
Tag again.
The Reader/Writer communicates with the RF Tag in
the communications field of the Antenna when the
host device sends a command. If there is no RF Tag,
an RF Tag missing error will occur. If an RF Tag
communications error occurs, an error is detected
according to the nature of the error.
Once communication
Communi c ati o ns processi n g
RF Tag
Names and Functions of Components
Description
Response Processing completed.
Section 2
RFID System
33
User's Manual
(PROFINET)