Omron V680 Series User Manual page 107

 FIFO Trigger
After communicating with an RF Tag, access to that RF Tag is prohibited. The Reader/Writer sends a
response to the host device and then waits for another query.
The Reader/Writer communicates in turn with each of the RF
Tags that enters the communications field. If two RF Tags
enter the communications field at the same time, a collision
occurs, resulting in an RF Tag communications error.
RF Tag
Host device Reader/Writer
Host device Reader/Writer
Reader/Writer RF Tag
RF Tag operation
FIFO Trigger communications cannot be used for communicating with V680-D1KP RF Tags.
Reader/Writer
FIFO trigger
communications
Response
Communications
processing
RF Tag
Processing completed.
Indicates that access is prohibited.
RFID System
Section 6
Functions
105
User's Manual
(Modbus TCP)