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4-5
When reading data or writing fixed data, you can use "Repeat Auto" designation or "Repeat Trigger" designation. However, if you write
different data per tag or if you use several commands (e.g., read → judge → write), you cannot use this function.
To enable this process, you can use the Tag Designation function. By using this function, regardless of timing, you can only send the
commands consecutively to communication with an objective tag without fail. Moreover, a sensor for tag detection is not required. So,
the system configuration can be simplified.
<Example of process sequence>
When you execute a command 1 and command 2 to the tags (A, B, ...) moving continuously, you can use the following sequence.
When you write different data into the tags (A, B, ...) moving continuously, you can use the following sequence.
Code Description
“sa” When a tag enters the communication area, the communication to the tag is executed. The communication is
made to any tag other than the tag to which the communication has been executed immediately before. If the
same tag exists continuously, the system waits until any other tag enters the communication area.
“st”
When a command has been received, the communication is executed to the tag in the communication area. The communi-
cation is made to the same tag to which the communication has been executed immediately before. Even if any different tag
is in the communication area, an error occurs to indicate that there is no tag in the communication area.
Host
↓
Controller
Host
↑
Controller
Controller
↓↑
Tag
Tag
in communication
area
Command 1
(sa
designation)
Command 2
(st
designation)
Command 1
(sa
designation)
Command 2
(st
designation)
Response
Response
Response
Response
Waiting
for a new
tag
Commu-
nication
1A
Waiting
for a new
tag
Previous ta g
only
Commu-
nication
2A
Commu-
nication
1B
Commu-
nication
2B
Previous tag
only
Tag A
Tag B
Command 1
(sa
designation)
Host
↓
Controller
Host
↑
Controller
Controller
↓↑
Tag
Tag
in communication
area
Command 1
(sa
designation)
Command 2
(st
designation)
Response
Waiting
for a new
tag
Commu-
nication
A
Tag A
Command 2
(sa
designation)
Response
Waiting for a new tag
Commu-
nication
B
Waiting for a new tag
Tag B
4-2 Tag Designation Function