Siemens SIMATIC RF600 Series System Manual page 154

Readers
5.4 RF685R reader
Ground connection
Ground connection
5.4.2 Planning operation
5.4.2.1 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.
In order to avoid this, always keep a minimum distance of 6 m between two readers with the
maximum radiated power of 2000 mW ERP.
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 use the internal antenna of the reader, we recommend that you close the external,
unused antenna connector on the reader using the supplied protective cap.
154
(a) Hexagon-head screw
(b) Flat washer
(c) Cable lug
(d) Contact washer:
To make ground contact, use contact wash-
ers according to the Siemens standard: SN
70093-6-FStflNnnc- 480h, Siemens item no.:
H70093-A60-Z3
System Manual, 10/2016, J31069-D0171-U001-A19-7618
SIMATIC RF600