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3-1
You can use one of the three communication modes according to the number of tags in the communication area and the situation. The
communication mode can be specified in the communication designation in a command.
(1) Single mode
In the Single mode, the communication is made to one tag in the antenna commu-
nication area. In the Single mode, only one tag must be placed in the antenna com-
munication area. If two or more tags are in the antenna communication area, a
communication error occurs.
(2) FIFO mode (First-In First-Out)
The FIFO mode enables to access the tags coming in the communication area
sequentially one by one. When the communication to one tag has been completed,
the tag is prohibited from communicating. So, even if there is any tag, which
ended the communication, in the antenna communication area, the communication
can be made to the next target tag. When the tag prohibited from communicating
has gone out of the antenna communication area, such tag can communicate again.
(3) Multi mode
When there are several tags in the antenna communication area, the Multi mode
enables to access all those tags. By using the Selective Access function, the com-
munication can be made to a specified tag of those in the antenna communication
area.
Correct Usage
When you use the FIFO mode, only one tag must be placed in the antenna communication area. If two or more tags are
in the antenna communication area, a communication error occurs. Then, the communication cannot be recovered from
failure unless only one tag is in the antenna communication area.
Chapter 3 Functions
3-1 Single/FIFO/Multi Mode Access Function