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OBID i-scan
®
System-Manual
ID ISC.MR200
FEIG ELECTRONIC GmbH
Page 130 of 144
H40801-5e-ID-B.doc
10. Protocols for Buffered Read Mode
10.1. The Buffered Read Mode Procedure
By using the “BRM” the Reader itself reads data from every Transponder which is inside the antenna
field. This mode must be enabled in the
3.3. CFG1: Interface
configuration block and configured in the
3.10. CFG11 Read Mode Data
and
3.11. CFG12: Read Mode - Filter
configuration block.
The sampled Transponder data sets are stored in a FIFO organized data buffer inside the Reader.
The buffered read mode runs offline from any host commands and it is immediately started after power
up or a
5.4.
[0x64] System Reset
command.
Only two commands are necessary to read out sampled Transponder data sets. The figure below il-
lustrates the Buffered Read Mode procedure:
Host
→
Reader
[0x22]
Read Buffer
Command to the Reader
to read data
Ø
typ. 6 ms
Host
←
Reader:
Status e.g. = 0x92
No Valid Data
there are no data sets inside the data buffer
Ù
.
Ù
.
Ù
.
Ù
.
Host
→
Reader
[0x22]
Read Buffer
Command to the Reader
to read data
Ø
typ. 6 ms
Host
←
Reader:
Status e.g. = OK
and n Data Sets
there are data sets inside the data buffer and
n data sets are transferred to the host
Ù
.
Ù
.
Ù
.
Host
→
Reader
[0x32]
Clear Data Buffer
Command to the Reader
to clear the read data sets
Ø
typ. 6 ms
Host
←
Reader
Status e.g. = OK
the n read out data sets are
cleared from the data buffer
Ø
:
Host waits for an answer from the Reader
Ù
:
Host is able to do other jobs e.g. to communicate with other Readers
Additional information about the capacity of the data buffer can be determined with the
10.4. [0x31]
Read Data Buffer Info
command.