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5-2 Communication Operation Sequence
5-5
5-2-2 Communication Mode with Communication Designation
(1) Polling
When one host device controls several antennas, if a normal auto command is used, a response is returned when the tag communication
has completed. In this case, several antennas return a response. For polling, the antenna returns the response at the request of the host
device. So, some responses are not returned simultaneously and several antennas can be controlled.
To terminate polling:
•
When an auto repeat cancel command (C2) is issued, the antenna discontinues Polling Auto/Polling Repeat and becomes ready to
accept a command.
•
When any other command is issued, the antenna discontinues a polling mode and executes the new command. If the command for-
mat is wrong, the antenna returns the format error response 14 and discontinues Polling Auto/Polling 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 discontinues Polling Auto. For Polling Auto, the antenna returns an error response and continues Polling
Repeat.
When a command is executed, the tag is in a sleep mode or standby mode according to the communication designation (C
!
, R
!
).