turck TBEN-L4-4RFID-8DXP, Инструкция по эксплуатации

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Operation
Query UID in HF Continuous bus mode
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9.7 Query UID in HF Continuous bus mode
There are three ways of querying the UID in HF Continuous bus mode.
n
Using HF bus mode in Idle
n
Using the Inventory command in HF bus mode
n
Using HF Continuous bus mode with the Inventory command
The following tables describe the benefits and disadvantages of the particular applications.
Application Functions Notes
Using HF bus mode
in Idle
n
UID is automatically displayed in the input
data.
n
If tags with different UIDs are present in the
detection range of different read/write
heads, the UID is overwritten with each
detection operation: Data loss possible.
n
No commands required by the controller
n
Grouping function only possible via the
controller
Using the Inventory
command in HF
bus mode
n
Inventory command must be sent individu-
ally to each read/write head.
n
UID is displayed in the input data.
n
No overwriting of data: Only one read/write
head performs the particular command.
n
Only useful for static applications: The bus
cycle time must be shorter than the time
until a new tag is in the field.
n
Grouping function only possible via the
controller
Using HF Continu-
ous bus mode with
Inventory com-
mand
n
Inventory command must be sent once by
the controller.
n
All UIDs are stored with the read/write head
address in the ring memory of the TBEN
module: No data loss.
n
The Get data from buffer command trans-
fers the data to the controller.
n
All read/write heads are activated and save
data.
n
Grouping function possible as long as the
data was not yet sent to the controller