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Communications Methods
5-5
Communications Methods
For communications, settings for access and mode should be made according to the state of Tags in
the communications area of the Antenna and their operation after the Tags receive commands.
5-5-1 Access Settings
There are the following four access settings according to the number of Tags in the communications
area and their states.
1) Single Access
In single access, a single Tag can exist in the communications area. The presence of two or
more Tags in the communications area causes a communications error.
2) FIFO Access
In FIFO (first-in, first-out) access, communications with Tags entering the communications area
one after another are carried out in sequence. Once communications with Tags are completed,
access to them is prohibited. Consequently, even if Tags with which communications are already
completed exist in the communications area, a newly entering Tag can be accessed. Simultane-
ous entering of two or more Tags causes a communications error. Once an access-prohibited
Tag leaves the communications area, access to the Tag is enabled again.
5-32
Section 5-5
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