OBID i-scan
®
System-Manual
ID ISC.MR200
FEIG ELECTRONIC GmbH
Page 14 of 144
H40801-5e-ID-B.doc
1.3. 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 detection
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. [0x22] Read Buffer
command. This com-
mand always reads the first available data sets from the data buffer. However already read data has to
be deleted with the
10.5. [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
3.3. CFG1: Interface
configuration block the Reader im-
mediately starts sampling Transponder data after power up. The Buffered Read Mode can be reini-
tialized with the
10.6. [0x33] Initialize Buffer
command.
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.
•
The Buffered Read Mode is only available if Scan Mode is disabled
