Specifications
6 - 7 6 - 7
6. HOW TO COMMUNICATE WITH ID TAGS
6.3.4 FIFO trigger
With the FIFO trigger communication specification, communication is performed while
the ID tag is stopped within the antenna communication area.
1. When the ID command execution request (RYn4) is turned ON, ID-BUSY (Rxn3) is
turned ON and communication with the ID tag is started.
2. After communication with the ID tag ends, operation of the ID tag is disabled, and ID
command complete (RXn4) turns ON.
3. When the ID command execution request (RYn4) is turned OFF, ID-BUSY (RXn3) and
ID command complete (RXn4) turns OFF, and the module changes to a standby state.
4. When an operable ID tag does not exist within the antenna communication area the
moment the ID command execution request (RXn4) is turned ON, bit 10 of the error
details storage area (RWrm+1H) turns ON and error detection (RXn5) turns ON.
5. With the FIFO trigger communication specification, communication is possible if
there is one operable ID 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.
No
dete cti on
(Movement of ID tag C)
Tag not present error
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)
Communication Communi ca tion
Within
communication area
Within
communication area
Op er at ion disab le d
Operation disabled
Within
communicat ion area
The operation of an ID tag that
completed communication is disabled.
When the ID tag moves outside the
communication area, the operation
disabled status is cleared.
When the ID command execution request is
turned ON, communication is performed with
an operable ID tag that exists within the
communication area. When an operable ID
tag is not present, a tag not present error
occurs.
Communication area
ID tag A
ID tag B
ID tag C
Antenna