Readers
5.5 SIMATIC RF685R
SIMATIC RF600
180 System Manual, 11/2018, J31069-D0171-U001-A21-7618
(b) Flat washer
(d) Contact washer
5.5.2 Planning operation
5.5.2.1 Internal antenna
Minimum mounting clearances of two readers
The RF685R has an adjustable antenna (linear horizontal or linear vertical). This means that
you can set the antenna polarization to be either horizontal, vertical or circular. With the
internal antenna active and at 2000 mW ERP radiated power, due to the aperture angle of
the antennas, their fields can overlap considerably. This means it is no longer possible to be
sure in which of the antenna fields the data of a transponder will be accessed.
To avoid these cases, always observe the recommended minimum distances between two
readers as described in the section "Reciprocal influence of read points (Page 47)".
Dense Reader Mode (DRM)
The readers can also interfere with each other (secondary fields), if the channels (Reader
TX, Transponder TX) overlap. In order to prevent a transponder channel overlapping with a
reader channel, we recommend that the Dense Reader Mode (DRM) is used.
Note
Protective cap
If you only use the internal antenna of the reader, we
recommend that you close the
nal, unused antenna connector on the reader using the supplied protective cap.
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