Omron V680S Series User Manual page 33

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
Auto
FIFO Trigger
 Once
Communications with the RF Tag are performed according to queries that are sent from the host
device.
When the Reader/Writer has completed communicating with the RF Tag, it sends a response to the
host device and then waits for another query.
If there is no RF Tag in the interrogation zone when the Reader/Writer receives a query from the host
device, the Reader/Writer returns an RF Tag missing error (error code: 2001 hex). Use a sensor or
other means to confirm the presence of an RF Tag before sending the query.
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 query, it returns a response.
When the Reade/ Writer receives a query, it waits until an RF Tag is detected within the
interrogation zone, and then returns a response.
When the Reader/Writer receives a query, it returns a response.
After communicating, all further operations with that RF Tag are prohibited. The Reader/Writer
communicates with only one operable RF Tag in the interrogation zone.
If an RF Tag that has been communicated with for a Once specification is within the interrogation
zone, the Reader/Writer will not communicate with it a second time.
The Reader/Writer communicates with the RF Tag in the
interrogation zone of the antenna when the host device sends
a query.
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
Communications
processing
Names and Functions of Components
Description
Response
RF Tag
Section 2
Processing completed.
RFID System
User's Manual
31