Data transmission between RF290R and host
3.4 Scan Mode
RF290R
Configuration Manual, 09/2014, C79000-G8976-C377-01
17
Figure 3-12 Sequence when deleting in Buffered Read Mode
Note
Note the following information about the "Buffered Read Mode":
•
In "Buffered Read Mode", only read operations are possible.
•
The "Buffered Read Mode" can only be used when the "Scan Mode" is turned off.
3.4
Scan Mode
In this mode the reader sends data unsolicited to the host as soon as there is a transponder
in the antenna field and it was possible to read valid data.
If "Scan Mode" is set, the content of the message block (UID, data block) can be adapted to
any user application. The "Scan Mode" can be used with the asynchronous interface.
The reader begins with the output of the protocol block as soon as all required data has been
read correctly from the transponder. If the reader cannot read all data of a protocol block
completely and free of errors, it does not output any data. If, for example, the address of the
data block is invalid, the UID of the transponder is not sent.
Scan mode via the asynchronous interface
The data is output depending on its configuration according to the following scheme. The
specified order cannot be changed.
The format of the protocols sent depends on the configuration and number of transponders
in the antenna field of the reader.
Example 1:
There is one transponder in the antenna field. The UID and data block are to be read:
