2. RS320BT to a Bluetooth adapter connected to a Computer Serial
Port.
Under this scenario, a Bluetooth adapter is used in the same manner as in
the previous scenario, however, as you will see the Bluetooth Adapter cable
is different. This cable allows the adapter to be connected to the serial port
of a computer (using the 9 Pin Dee fitting) and also to receive power from
the computer (using the USB cable).
The reader Bluetooth configuration is exactly the same as the previous
scenario.
The software on the computer should be set to connect to the reader, via the
serial port as if there was a cable in place. This scenario also allows
computers to be used that are not Bluetooth enabled.
Factors that affect read range performance
Tag reader efficiency is often linked with reading distance. The Stick
Reader's read distance performance is affected by the following factors:
Transponder orientation - To obtain maximum reading distance, the axes of
the transponder and reader antenna coils must be optimally orientated as
shown in Figure 2.
Transponder quality - Each manufacturer's transponder differs by (a) the
level of exciter signal energy required for the transponder internal circuits to
operate sufficiently, (b) the signal level of the ID code information that is
returned to the reader. Consequently, it is normal to find that common type
transponders (for example, FDX-B) from different manufacturers have
different read range performance levels.
Animal movement - If the animal moves too quickly, the reader may not be
located in the read zone long enough for the ID code information to be
obtained.
Transponder type - HDX transponders generally have larger reading
distances than similar-sized FDX-B transponders.
Nearby metal objects - Metal objects located near a transponder or reader
may attenuate and distort the magnetic fields generated in RFID systems
and therefore, reduce reading distance. A good example being the eartag
being caught in a head bale significantly reduces the read distance.
Electrical noise interference - The operating principle of RFID transponders
and readers is based on electromagnetic signals. Other electromagnetic
phenomena, such as radiated electrical noise from other RFID tag readers,
or computer screens may interfere with RFID signal transmission and
reception and therefore, reduce reading distance.
Transponder/reader interference - Several transponders in the reception
range of the reader, or other readers that emit excitation energy close by
may adversely affect reader performance or prevent the Stick Reader from
operating.
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