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Section 6 Multi-Reader/Writer Operation
RFID System
User's Manual
(Modbus TCP)
Section 6
Functions
Field Extension Mode
You can use this mode to link Reader/Writers in order to extend the effective communications field of a
Reader/Writer. Even if the workpieces are not all the same height or not oriented in the same direction,
the placement of more than one Reader/Writer enables communicating with the RF Tags without
worrying about the positions or orientation of the RF Tags.
This mode enables communications over a wide communications field and is therefore recommended
for applications in which the locations or orientation of the RF Tags is not consistent.
If you use Field Extension Mode, you can use only three RF Tag communications queries: READ
DATA, WRITE DATA, and READ ID. Also, you can specify only the Once or Auto communications
option. If you use the FIFO Trigger communications option in Field Extension Mode, an execution
status error will be indicated in the response.
Applicable RF Tag Communications Queries
Applicable Communications Options
In Field Extension Mode, the Reader/Writers do not simultaneously perform communications.
The Reader/Writers individually perform communications on a time sharing basis.
For details, refer to Using Field Extension Mode in this section.
p.138
Supported
READ DATA Yes
WRITE DATA Yes
DATA FILL No
RF TAG OVERWRITE COUNT CONTROL No
READ ID Yes
COPY No
LOCK No
Supported
Once Yes
Auto Yes
FIFO Trigger No
PLC
Switching Hub
Master
Reader/Writer
Slave
Reader/Writer
Slave
Reader/Writer
Effectively expanded communications field
Communicating with RF Tags is possible without being affected by the orientation of the workpieces
(i.e., the locations where the RF Tags are attached).
Slave
Reader/Writer
RF Tag
RF Tag
Workpiece
Workpiece
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