UHF-Reader
Manual
ID ISC.ANT.U500/270 - DM
FEIG ELECTRONIC GmbH
Page 13 of 117
H71011-0e-ID-B.docx
5.2. 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.
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
12.6. [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
12.7. [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.
