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Focus
Use Focus Mode to differentially communicate with the RF Tag that is just in front of the
Reader/Writer.
When the Reader/Writer is in operation in Focus Mode, it constantly monitors RF Tags in the com-
munications range. When the Reader/Writer receives a command from the host device, it automati-
cally selects, from all of the monitored RF Tags, the RF Tag that is in front of the Reader/Writer (the
target RF Tag) and communicates with it. Even if there are RF Tags that are not to be read in the
communications range (non-target RF Tags), the Reader/Writer communicates only with the target
RF Tag in front of the Reader/Writer.
You can use Focus Mode to help prevent reading non-target RF Tags or to help prevent missing the
target RF Tag due to reading non-target RF Tags.
It is necessary to use a sensor or other device to confirm that the target RF Tag is in front of the
Reader/Writer before the command is executed.
Precautions for Correct Use
When the Reader/Writer is in operation in Focus Mode, it calculates the target levels for the RF
Tags in the communications range. When the command from the host device is executed, the
Reader/Writer selects the target RF Tag with the highest target level. The selected RF Tag is
identified as already being processed and the Reader/Writer will not communicate with it again
until it leaves the communications range. If the RF Tag enters the communications range again,
communications are again enabled with it as a selection candidate. (The "processed" status is
cleared when the target level drops to 0 or lower.)
If there is only one RF Tag in the communications range when the command is executed, that
RF Tag will be selected as the target RF Tag. However, any RF Tag that was previously com-
municated with and is identified as having already been processed will not be selected as the
target RF Tag.
UHF RFID System V780-series Reader/Writer User's Manual (Z389)
Non-target RF Tag B
Non-target RF Tag C
Target RF Tag A
Reader/Writer
Non-target RF Tag D
6 Functions
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