6 - 18
6 - 18
6. HOW TO COMMUNICATE WITH ID TAGS
6.3.5 FIFO repeat
With the FIFO repeat communication specification, communication is performed while
the ID tag is being moved.
Communication is performed with the ID tags that enter the antenna communication area
one after the other, until the ID instruction execution request (Y14, Y1C) is turned OFF.
1. When the ID instruction execution request (Y14, Y1C) is turned ON, detection of
operable ID tags is started.
2. When the ID tag enters within the antenna communication area, communication with
the ID tag is started.
3. After communication with the ID tag ends, operation of the ID tag is disabled, and ID
instruction complete (X4, XC) turns ON.
4. When result reception (Y16, Y1E) is turned ON, ID instruction complete (X4, XC)
turns OFF, and detection of the next ID tag that enters the antenna communication
area is started.
5. Subsequently, Steps 2 to 4 are repeated.
6. When the ID instruction execution request (Y14, Y1C) is turned OFF, ID tag
detection is ended.
7. Communication is possible if there is one operable tag among the ID tags within the
antenna communication area.
When two or more operable ID tags
exist, communication cannot be
performed normally and error
detection (X5, XD) turns ON.
The operation of an ID tag that completed
communication is disabled.
When the ID tag moves outside the
communication area or the ID instruction
execution request (Y14, Y1C) is turned OFF,
the operation disabled status is cleared.
Communication is started by
the ID tag entering within the
communication area.
Communication area
ID tag C
ID tag A
ID tag B
Waiting for ID tag
Waiting for ID tag
(Movement of ID tag C)
ID instruction complete (X4, XC)
Communication with ID tag
(Movement of ID tag A)
ID instruction execution request (Y14, Y1C)
ID-BUSY(X3, XB)
(Movement of ID tag B)
Error detection (X5, XD)
Result reception (Y16, Y1E)
ID communication complete (X2, XA)
Communication
Communication
Communication
Within
communication area
Within
communication area
Within
communication area
Operation disabled
Operation disabled
Operation disabled
Waiting for ID tag
