Omron V720S Series, Руководство по эксплуатации

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Other Commands
Section 5-8
5-56
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.
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.
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.
Trigger command
(Host) (Reader/Writer) (Tag)
Yet to enter
Communications Tag
Tag
(Stationary)
(Stationary)
Send a response
Command end
(1) Sends a commands if a Tag is in the R/W
Antenna’s communication range.
(2) The Reader/Writer communicates
according to the command.
(3) On completion of communications, the
Reader/Writer returns a response to the
host.
Note Before using Trigger Mode, check that the Tags are not moving and are
within the Antenna's communications area.