OBID
i-scan
®
UHF
Manual
ID ISC.LRU3000/3500
FEIG ELECTRONIC GmbH
Page 15 of 193
H90202-7e-ID-B.docx
5.3. 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 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. Up to 10000 datasets can be stored into the buffer. In case of power
down the buffer will be initialized and all datasets got lost.
The sampled Transponder data can be read with the
command always reads the first available data sets from the data buffer. However data already
read have to be deleted with the
11.6. [0x32] Clear Data Buffer
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
Reader immediately starts sampling Transponder data after power up. The Buffered Read Mode
can be reinitialized with the
11.7. [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 read operations are available with the Buffered Read Mode.
