5-2
Section
Communications Sequences
70
Precautions when using the Selective Access Function
1, 2, 3...
1. When using the selective access function, the Controller must be set to En-
ergy-saving mode by turning on pin 5 of DIP switch 3 (SW3-5) on the Con-
troller. A command error will occur if the selective access function is used
while the Controller is in regular emission mode.
2. If the Tag specify command is executed but the ID Tag with the specified ID
number isn’t within the communication area, the Controller will return a “No
Tag” error to the host device.
Host device
Tag detect command
Controller
Response (With ID number 0)
Tag
Tag (0)
Response received
Communications processing
Response (With ID number 1)
Tag (1)
Response received
Communications processing
Tag detection completed response “72”
Response received
Command specifying Tag (1)
Tag (1)
not found
Response received
No Tag error response
3. If the Tag specify command is executed with a temporary ID number that
wasn’t recorded in the Controller, the Controller will return a “No Tag” error to
the host device.
Host device
Tag detect command
Controller
Response (With ID number 0)
Tag
Tag (0)
Response received
Communications processing
Response (With ID number 1)
Tag (1)
Response received
Communications processing
Tag detection completed response “72”
Response received
Command specifying Tag (2)
Response received
No Tag error response
4. If there are 17 or more ID Tags within the communication area when the Tag
detect command is executed, the Controller will record temporary ID num-
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