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3-1
Section
Single, FIFO Read/Write, and Multiple Access Functions
26
3-1
Single, FIFO Read/Write, and Multiple Access Functions
Three communication modes are available depending on the number or state of
Tags in the communication area. Commands can be used for selecting one of
them.
In this mode, the Controller communicates with just one ID Tag in the commu-
nication area. Set up the system so that only one ID Tag can be in the commu-
nications area at a time. A communications error will occur if there are two or
more ID Tags in the Antenna’s communication area.
In the FIFO (first-in, first-out) read/write mode, the RFID System reads and
writes data to and from each ID Tag coming into the communications area one
after another. Since every ID Tag finished with communications is set to access
prohibit, communications will be performed only with the next ID Tag that arrives
in the Antenna’s communication area.
When a Tag moves out of the Antenna’s communications area, it’s “access pro-
hibit” status is released and it can communicate again.
In this mode, communications with all ID Tags in the communications area can
be made on receipt of the command.
If the selective access function is being used, it is possible to communicate with
a particular Tag out of the multiple Tags in the Antenna’s communications area.
Single Mode
FIFO Read/Write Mode
Multiple, Simultaneous
Access Mode
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