Omron CJ1W-V680C11, User Manual

Page: 91 / 214

SECTION 5
Commun
ic
a
tion
s Spec
if
icat
io
ns
SECTION 5
ID Sensor Unit Functions
89
RFID System
User's Manual
FIFO Trigger
With a FIFO trigger communications specification, communications are executed with a RF Tag when a
command is sent. After communicating, the ID Sensor Unit returns a response. Operations are
prohibited for RF Tags that have completed communications until they leave the interrogation zone.
After the ID Sensor Unit sends a response, it will wait for the next command. If there is no RF Tag in the
interrogation zone when the ID Sensor Unit receives the command from the CPU Unit, the ID Sensor
Unit will return an RF Tag missing error.
With the FIFO trigger communications specification, even if there are RF Tags in the interrogation zone
that have completed communications, the ID Sensor Unit can still communicate with the next RF Tag.
(Commands will be accepted for an Antenna that is not processing a command.)
To communicate with RF Tags in the interrogation zone that have completed communications, turn ON the Abort Bit in
the Special I/O Unit Area (CIO n, bit 02) to cancel processing.
When using the V680-D2KF @@ /-D @ KF68/V680S-D2KF6 @ with a FIFO trigger specification, the normal
communications speed will be used regardless of the setting in DM m+0.
FIFO trigger specification cannot be used for communicating with V680-D1KP
@@
RF Tags.
The Controller comm u nicates w ith an RF Tag
in the interrogation zone w hen a command is
recei v ed from the CPU Unit. If there is no RF
Tag, an RF Tag missing error w ill b e ret u rned
in the response.
Antenna
RF Tag
Interrogation zone
An RF Tag that has completed
comm
u nications and for w hich
operations are prohi b ited.
Res u lts
RF Tag A
FIFO Trigger specification:
FIFO Trigger specification
FIFO Trigger specification
FIFO Trigger specification
Comm. C
RF Tag C (missing)
RF Tag A
comm
u nications
completed
Tag missing error
Res u lts
Res u lts
Comm. B
Comm. A
RF Tag B
RF Tag mo v ement
RF Tag mo v ement
Command Exec u tion Bit
A b ort Bit
ID B u sy Flag
N ormal End Flag
Error End Flag
Comm u nications w ith
RF Tag
N ote: Res u lts w ill b e ret u rned w hether
an RF Tag is present.