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Other Commands
Exceptions
When the Tags with the temporary numbers selected by the Tag Selection Command are not pre-
sent, the Reader/Writer returns a communications error to the host.
When the Tag Selection Command selects temporary numbers other than those stored by the
Reader/Writer by the Tag Detection Command, the Reader/Writer returns a format error to the host.
The temporary number once stored by the Reader/Writer is not deleted until the Reader/Writer exe-
cutes the Stop Command. Commands other than selective access commands (excluding the Reset
Command (XZ)) are not accepted until the Reader/Writer executes the Stop Command. When the
Tag Detection Command has been executed once, it cannot be performed again until processing
has been completed.
5-8-2 Mode Settings
There are the following four mode settings according to the state of the Reader/Writer and of Tags.
5-8-2-1 Trigger Mode
In trigger mode, communications with a stationary Tag in the communications area are carried out.
When no Tag is present in the area, an error response is returned.
(Host)
Trigger command
Command end
5-56
Note The Tag Detection Command means that "LT" is set to the "communications
method" for a command frame. Also, the selection of Tag(1) means that "01"
is set to the "communications method " for the command frame.
(Reader/Writer)
Communications
Send a response
Note Before using Trigger Mode, check that the Tags are not moving and are
within the Antenna's communications area.
(Tag)
Yet to enter
(1) Sends a commands if a Tag is in the R/W
Antenna's communication range.
Tag
(Stationary)
(2) The Reader/Writer communicates
according to the command.
Tag
(Stationary)
(3) On completion of communications, the
Reader/Writer returns a response to the
host.
Section 5-8
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