5-2
Section
Communications Sequences
69
Overview of the Selective Access Function
Host device
Controller
Tag detect command
Response (With ID number 0)
Tag
Tag (0)
Response received
Communications processing
Response (With ID number 1)
Tag (1)
Response received
Communications processing
Response (With ID number 2)
Tag (2)
Response received
Communications processing
Tag detection completed response “72”
Response received
Command specifying Tag (1)
Response from Tag (1)
Tag (1)
Response received
Communications processing
Command specifying Tag (2)
Response from Tag (2)
Tag (2)
Response received
Communications processing
STOP command
Temporary ID numbers cleared
Response received
1, 2, 3...
1. The host sends the Tag detect command to the Controller.
2. The Controller communicates with the ID Tags that are in the Antenna’s
communication area, records up to 16 temporary ID numbers (0 to F) inter-
nally, and attaches the corresponding ID numbers with each response to the
host device. When the Controller has completed communications with all of
the ID Tags in the communications area, it returns a response indicating that
Tag detection has been completed.
3. Send a Tag specify command to the Controller with the ID number of the ID
Tag with which you want to communicate.
4. The Controller executes the Tag specify command on the specified ID Tag.
5. When all of the required processing has been completed, send a STOP
command from the host device to the Controller. When the Controller re-
ceives the STOP command, it erases the previously stored ID numbers.
(The stored ID numbers will not be erased until the STOP command is exe-
cuted.)
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