OBID
i-scan
®
HF System-Manual
ID
ISC.LR1002
FEIG ELECTRONIC GmbH
Page 17 of 173
H20411-0e-ID-B.docx
3.3. Buffered Read Mode
The Buffered Read Mode is a high level operating mode to detect Transponders which are within
the detection range of the Reader. This operation mode is especially designed for applications
which use Transponders to identify objects. The Buffered Read Mode processes all Transponder
read data and filter operations to make the user interface transparent to Transponder data and to
minimize data transfers between Reader and host. There are only three commands used to control
Buffered Read Mode.
In this operating mode the Reader automatically selects Transponders which are within the detec-
tion range of the Reader and reads their requested data. The read Transponder data is stored in a
‘FIFO’ organized data buffer.
The sampled Transponder data can be read with the
10.3. Transponder Access in the Buffered
Read Mode and Notification Mode
command. This command always reads the first available data
sets from the data buffer. However already read data has to be deleted with the
command before the next data sets in the data buffer can be reached with the read
command.
If the Buffered Read Mode is enabled in the
configuration block the Reader
immediately starts sampling Transponder data after power up. The Buffered Read Mode can be
reinitialized with the
10.7. [0x33] Initialize Buffer
If turned to Buffered Read Mode the Reader answers every valid message with data- or status-
protocol. The answer includes the control byte which has been received by the Reader.
Host (Terminal / PC / ....)
Reader
read data
→
Transponder data in data buffer ?
Yes
No
←
status /
data protocol
status = no valid
data
←
clear data
→
Transponder data read ?
Yes
No
←
OK status
status = no valid
data
←
Note:
•
Only transponder read operations are available with the Buffered Read Mode.
•
The Buffered Read Mode is only available if Scan Mode is disabled
