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5-3
Section
Command and Response Frame Structure
71
bers for the first 16 ID Tags but will not record ID numbers for the remaining
ID Tags. The Controller will return responses for all of the ID Tags and will
attach “X” as the ID number for the 17
th
and higher Tags. (A command error
will occur if the Tag specify command is executed with “X” as the ID number.)
5. Once the ID numbers are recorded in the Controller, they are not erased un-
til the STOP command is executed. Only the two selective access com-
mands and the RESET command (XZ) can be received until the STOP com-
mand is executed. If the Tag detect command is executed again and no new
ID Tags have arrived in the communication area, the Controller will return
just the Tag detection completed response.
6. If new ID Tags have arrived in the communication area since the Tag detect
command was last executed and the Tag detect command is executed
again, the Controller will communicate only with the newly arrived Tags and
record their new ID numbers internally. (If 16 ID numbers have already been
recorded, the Controller will return ID number “X” as described above in step
4.)
Host device
Tag detect command
Controller
Response (With ID number 0)
Tag
Tag (0)
Response received
Communications processing
Response (With ID number F)
Tag (15)
Response received
Communications processing
Tag detection completed response “72”
Response received
Response received
Response (With ID number X)
Tag (16)
Response received
Communications processing
Response received
Tag detect command (executed again)
Tag detection completed response “72”
Same Tags
(0 to 16)
Note The Controller must be set to Energy-saving mode when using the selective ac-
cess function.
5-3
Command and Response Frame Structure
Commands and responses exchanged between the host and Controllers are in
the following frame structure. A DIP Switch setting (pin SW3–1) can be used to
enable or disable attachment of the BCC byte.
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