Omron V780-Series User Manual page 85

Repeat
When the Reader/Writer receives a command execution request from the host device, it automatically
detects the entry of RF Tag in the communications field and communicates with it. This process is
repeated until the command execution request is cleared. You can use this specification to perform
communications with RF Tags in order as they move past the Reader/Writer.
The communication results of the RF Tags returned to the host device are not returned until the
smoothing buffer becomes full. Once the command execution request is cleared, the smoothing buffer
is cleared. The size of the smoothing buffer can be changed according to the settings.
Single-access Operation
RF Tag
The Reader/Writer waits for an RF Tag to enter the communications range and returns the communica-
tions results after it detects an RF Tag.
The communications operation continues until the command execution request from the host device is cleared.
Communications command
Host device
Reader/Writer
RF Tag movement
Additional Information
The behavior of the RF Tag that has communicated once with the Reader/Writer depends on
the Gen2 session setting in the advanced RF communications settings. For details, refer to
Gen2 Session on page 6-26.
Precautions for Correct Use
When the communications mode is "Repeat", no notice (error response) is sent to the host
device even if an RF Tag missing error or communications error occurs.
UHF RFID System V780-series Reader/Writer User's Manual (EtherNet/IP
Communications start when the RF
Tag enters the communications range.
RF Tag
Reader/Writer
Response
Repeat communications
Waiting for RF Tag Waiting for RF Tag
RF Tag A
Response
Waiting for RF Tag
RF Tag B
TM
) (Z402)
6 Functions
6
6 - 13