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5-2 Communication Operation Sequence
5-4
(3) Repeat
When an antenna receives a command from a host device, the antenna waits for tag approaching, communicates with the tag whenever
the tag passes the antenna communication area, and returns a response to the host device.
After the command is executed, by specifying the sleep state (S
!
) as the communication designation, FIFO (First-In First-Out. Refer to
Section 3-1) is enabled.
To terminate repeat state:
•
When an auto repeat cancel command (C2) is issued, the antenna discontinues Repeat and becomes ready to accept a command.
•
When any other command is issued, the antenna discontinues Repeat and executes the new command. If the command format is
wrong, the antenna returns the format error response 14 and discontinues 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 Repeat.
Repeat command
(Host device)
(Antenna)
(Tag)
Receives a
response
Communication
process
Response
Tag (1)
(Waits for a response)
(Waits for tag approaching)
(Waits for tag approaching)
Not yet approached
Not yet approached
Receives a
response
Communication
process
Response
Tag (2)
(Waits for a response)
(Waits for tag approaching)
Pass
Pass
Sleep
(Waits for tag approaching)
Pass
(Waits for a response)
Waits for tag
approaching
Not yet approached
Not yet approached
(1) The Repeat command is sent from the host device.
(2) The antenna does not return a response until the tag
approaches.
(3) When the tag passes the front of the antenna, the
antenna communicates with the tag according to a com-
mand.
(4) When the process has completed, the antenna returns a
response of the communication end to the host device
and waits for the next tag approaching.
(5) When the tag passes the front of the antenna again, the
antenna communicates with the tag.
(6) When the process has completed, the antenna returns a
response of the communication end to the host device.
Sleep