Omron V680-CA1D User Manual page 50

Section 4
Reading from/Writing to Tags
Read/Write Functions
• Read/Write Command Processing
The read/write functions are used for communications when the Tag has stopped. Therefore, check
that the Tag is at a fixed position, which is within the Read/Write Antenna's communications area.
If a Tag is not present, a "no tag" error response is returned.
(Host device)
Read/write
command
Command
completion
Auto Read/Write Functions
• Auto Command Processing
The Controller does not return a response for AUTO commands until the Tag is within range, i.e., the
communications path with the host device is busy during this time.
(Host device)
AUTO command
Busy status
Busy status
Command
completed
Heat-resistive RFID System
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User's Manual
(Controller)
(Tag)
Not in range
Tag
(Stopped)
Read/write
Tag
processing
(Stopped)
Response
Moving
(Controller) (Tag)
Not in range
Antenna
Antenna Not in range
Read/write
Tag
processing
Antenna
Response Passed
Antenna
(Processing
completed)
(1) The Tag is checked for whether it has stopped
at a specified location, and then the host
device sends the command.
(2) The Controller performs read or write process-
ing according to the command.
(3) After processing has been completed, the
Controller returns a processing completed
response to the host device. The host device
receives the response and then moves the
workpiece (with Tag) along the production
line.
(1) An AUTO command is sent to the Read/Write
Antenna from the host device.
(2) The Controller does not return a response
while the Tag is not in range, so the host
device is in busy status.
(3) Read or write processing is performed when
the Tag passes in front of the Antenna.
(4) After processing
Controller sends a processing completed
response for the AUTO command to the host
device.
has completed, the