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4-1 Communication Designation Function
4-1-2 Designation of Automatic System Communication (SA/RA/PA)
In the auto system communication designation, a tag is detected automatically. So, unlike the command trigger system, you do not need to check the tag.
Tag
Antenna
SA designation:
For the single designation (SA), the controller command processing is ended by terminating the communication.
SA mode command
Host → Controller
Host ← Controller
Controller ↔ Tag
(Tag action)
RA designation:
For the repeat designation (RA), the system waits until the next tag has come even after the communication is terminated. If the tag
once executes the communication, the tag does not execute the communication until it has moved out of the communication area.
Repeat processing is ended by a command process abort command (AA).
RA mode command
Host → Controller
Host ← Controller
Controller ↔ Tag
(Tag action)
PA designation:
In the PA designation, similarly with RA, processing is repeated until the processing is terminated by a command process abort com-
mand (AA). However, no response is made after the communication with one tag is ended. Response is returned by a polling query
(PC) command instead. Use this designation when several controllers are connected to a host device through RS-485, etc. (Commercial
232C/485 converter is required.)
PA designation command
Host → Controller
Host ← Controller
Controller ↔ Tag
(Tag action)
4-2
Response
End of process
Communication
Tag
Response
Waiting for a tag
Waiting for a new tag
Communication
Communication
A
B
Tag A
PC command
Response
Response
(Acceptance)
(No communication)
Waiting for a tag
When the tag enters the communica-
tion area, the communication starts.
Response
Response
Waiting for a new tag
Communication
C
Tag B
Tag B
PC command
Response
(Result of communication)
Communication
Tag
AA command
End of
Response
process
End of process
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