Omron V680-CA1D User Manual page 51

Polling Function
With normal AUTO commands, the Controller does not return a response while the Tag is not in range,
i.e., the communications path with the host device is busy.
With a POLLING AUTO command, however, the Controller returns a response if a request is received
from the host device. Therefore, the communications path does not continue to remain in busy status.
(Host device) (Controller)
POLLING AUTO
command
(Antenna)
Response
(Antenna)
Subcommand
(Request to Antenna)
Response
(Antenna not in range)
Read/write
processing
(Antenna)
Subcommand
(Request to Antenna)
Response
(Antenna processing
completed)
(Tag)
(1) A POLLING AUTO command is sent to the
Antenna.
Not in range
(2) After receiving the command, the Controller
immediately returns a response indicating that
the command was received.
(3) The host device can send subcommands to
Not in range
request to proceed with processing, or abort
polling auto processing.
Tag
(4) If the Tag is not in range, an out-of-range
response will be returned for the subcommand
Passed
request.
(5) Read or write processing is performed when
the Tag passes in front of the Read/Write
Antenna.
(6) After processing is completed, the Controller
returns a response with the processing results
to the
subcommand.
Section 4
Reading from/Writing to Tags
host device for the
Heat-resistive RFID System
User's Manual
request
49