Specifications
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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 command execution request (RYn4) is turned OFF.
1. When the ID command execution request (RYn4) is turned ON, ID-BUSY (Rxn3) is
turned ON and ID tag detection 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
command complete (RXn4) turns ON.
4. When result reception (RYn6) is turned ON, ID command complete (RXn4) 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 command execution request (RYn4) is turned OFF, ID-BUSY (RXn3) is
turned OFF and 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, bit 12 of the error details storage
area (RWrm+1H) turns ON, and error detection (RXn5) turns ON.
If the time set in the auto system command wait time setting area (RWwm+3H)
elapses during waiting for the communicable ID tag, bit 10 of the error details
storage area (RWrm+1H) turns ON and error detection (RXn5) turns ON.
Waiting for ID tag
(Movement of ID tag C)
ID command complete (RXn4)
Communication with ID tag
(Movement of ID tag A)
ID command execution request (RYn4)
ID-BUSY (RXn3)
(Movement of ID tag B)
Error detection (RXn5)
Result reception (RYn6)
ID communication complete (RXn2)
Co mmuni cat io n Commu nica tionCo mm un i c a tion
Within
commun icat io n area
Within
communication area
Within
communicat ion ar ea
Operation disabled
Operation disabled
Operation disabled
Waiting for ID tag
Waiti ng for ID tag
The operation of an ID tag that completed
communication is disabled.
When the ID tag moves outside the
communication area or the ID command
execution request (RYn4) 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
Antenna