Omron V680 Series User Manual page 147

 When the RF Tag Communications Option of the Master Reader/Writer Is Set to
Auto
1.
Send a READ DATA query from the host device to the Master Reader/Writer.
Slave
Reader/Writer No. 1
IP:192.168.1.201
IP:192.168.1.203
Slave
Reader/Writer No. 3
IP:192.168.1.202
Slave
Reader/Writer No. 2
2.
The Master Reader/Writer will communicate with the RF Tag using the Once communications option.
Here, communications will end normally or an RF Tag communications error will occur, the Reader/
Writer will return a response to the host device, and processing will end. If an RF Tag missing error is
detected, proceed to step 3.
Slave
Reader/Writer No. 1
IP:192.168.1.201
IP:192.168.1.203
Slave
Reader/Writer No. 3
IP:192.168.1.202
Slave
Reader/Writer No. 2
READ DATA query
Master Reader/Writer
IP:192.168.1.200
Master Reader/Writer
IP:192.168.1.200
Section 6
Functions
PLC
PLC
RFID System
145
User's Manual
(Modbus TCP)