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5-2 Communication Operation Sequence
5-7
(2) Multi
The communication to all the tags in the antenna communication area can be made. Multi Trigger and Multi Repeat commands are
available:
In Multi Trigger, the antenna communicates with all the tags in the communication area when it receives a command. When the process
has completed, the antenna returns the communication end response (termination code 72).
In Multi Repeat, the antenna waits for a tag when it receives a command. The antenna continues to communicate with all the tags com-
ing in the communication area.
To terminate Multi Repeat:
•
When an auto repeat cancel command (C2) is issued, the antenna discontinues Multi Repeat and becomes ready to accept a com-
mand.
•
When any other command is issued, the antenna discontinues Multi Repeat and executes the new command. If the command format
is wrong, the antenna returns the format error response 14 and discontinues Multi Repeat.
If a waiting time for tag (refer to Section 5-9-4) is set, when the waiting time for tag has been passed, the antenna returns the no-tag error
response 72 and continues Multi Repeat.
When a command is executed, the tag is in a sleep mode according to the communication designation (S
!
).
An example of Multi Trigger is shown below.
Multi S/M/L
Time Slot method (refer to "Appendix 1 - Glossary") is used to detect several tags. Select S, M or L to optimize the Multi communica-
tion time.
Code
Number of communicated tags
Number of time slots
S
M
L
Approximately 4 tags
Approximately 8 tags
Approximately 16 tags
8
16
32
Multi Trigger command
(Host device)
(Antenna)
(Tag)
Receives a response
Communication process
Response
Communication process
Response
"Communication End" response "72"
Receives a response
Receives a response
Tag (0)
Tag (1)