Omron V680-CA5D01-V2 User Manual page 177

SECTION 5
Communications
Polling Function
This section describes command processing when two Antennas are connected to one ID Controller.
With normal AUTO commands, the ID Controller does not return a response while the Tag is not in
range, i.e., the communications path with the host device is busy and the host device cannot send a
command to the other Antenna connected to the same ID Controller.
With a POLLING AUTO command, however, the ID Controller returns a response only when a request
is received from the host device. Therefore, the communications path does not continue to remain in
busy status and the host device can send a command to the other Antenna connected to the same ID
Controller.
(Host device)
POLLING AUTO
command
(Antenna 1)
POLLING AUTO
command
(Antenna 2)
Subcommand
(Query to
antenna 1)
Subcommand
(Query to
antenna 2)
Subcommand
(Query to
antenna 1)
RFID System
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User's Manual
(ID Controller) (Tag)
Response No Tag in area
(Antenna 1)
Response
No Tag in area
(Antenna 2)
No Tag in area
Response
(No Tag near
antenna 1)
Response
No Tag in area
(No Tag near
antenna 2)
Read/write
Tag
processing
(Antenna 1)
Tag out of area
Response
(Antenna 1
processing
completed)
1. A POLLING AUTO command is sent to Antenna
1.
2. After receiving the command, the ID Controller
immediately returns a response indicating that
the command was received.
3. A POLLING AUTO command is sent to Antenna
2.
4. After receiving the command, the ID Controller
immediately returns a response indicating that
the command was received.
5. The host device can send subcommands to
query processing status, or abort polling auto
processing.
6. If the Tag is not in range, an out-of-range
response will be returned for the query
subcommand.
7. Read or write processing is performed when the
Tag passes in front of the Read/Write Antenna.
8. After processing has been completed, the ID
Controller returns a response with the processing
results for Antenna 1 to the host device for the
query subcommand.