Omron V680S-HMD63-ETN User Manual page 95

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
"ID code" is a unique ID previously stored in each RF tag. By performing ID code check, even if an RF tag with another
ID code enters the communication area during communication processing, it does not communicate with that RF tag.
Refer to RF Tag Communications Time (for Reference Only) in Section 11 Appendices for details of Communications Time.
p.264
When the Reader/Writer receives a query, it returns a response.
After the Reader/Writer receives a query, the Reader/Writer automatically detects an RF Tag that
enters the communications field and communicates with it.
Communication can be carried out without confirming the existence of an RF tag by a sensor or
the like.
When the Reader/Writer receives a query, it communicates with an RF Tags and returns a
response when communicating with an RF Tag was possible.
The Reader/Writer can communicate with the another RF tag when the new RF tag comes in the
communication area, because the Reader/Writer stops the operation of the RF tag once
communicated.The Reader/Writer does not communicate with the RF tag once communicated
until the RF tag goes out of the communication area and enters the communication area again.
FIFO Trigger has the following two setting modes.
•Without ID code check
Process communication with RF tags without ID code check. Compared "With ID code check",
communication time becomes shorter. However, if the next tag enters the communication area
during communication processing with the RF tag, there is a possibility of reading the data of the
next RF tag.
It is the same communication function as the FIFO Trigger of the reader / writer of firmware version
"3.01 or earlier"
•With ID code check
Communication with RF tag is processed with ID code check. Even if the next tag enters the
communication area during communication processing with the RF tag, it will not read the data of
the next RF tag. RF tags can be installed at narrow pitch. However, compared with "Without ID
code check", communication time will be longer. Therefore, in order to ensure reliable
communication with the RF tag you want to communicate, we recommend "With ID code check".
It can be used with a reader / writer with firmware version "3.02 or later".
Description
Section 6
Functions
RFID System
93
User's Manual
(Modbus TCP)