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5-2
Section
Communications Sequences
63
5-2
Communications Sequences
The sequence of operations, such as the exchange of data and response timing,
depends upon the instructions requested in the command. Operation also de-
pends upon the status of the Tag within range of the Antenna and the status of
the connection with the host.
5-2-1 Single Trigger Mode
In single trigger mode, the Controller communicates with the ID Tag that is within
range when the command is received, so it is necessary to check that there is an
ID Tag within communications range before sending the command. If the ID Tag
is not within communications range, an error response is returned.
Host
TRIGGER
command
Command
end
Controller
Communications
processing
Response
Tag
Not approaching yet
Standstill
Tag
Standstill
Tag
1, 2, 3...
1. The host must send the command after checking that the ID Tag is within
communications range.
2. The Controller communicates with the ID Tag for data processing according
to the command.
3. After the data is processed, the Controller returns a response indicating that
the Controller is finished with data processing. The host receives the re-
sponse and waits for the next ID Tag to approach.
Note When operating the system in single trigger mode, send the command when an
ID Tag is within the communications range.
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