Advantech 5000 Series - Manual (Page 261)

RS-485 Network
Star Layout
In this scheme the repeaters are connected to drop-down cables from
the main wires of the first segment. A tree structure is the result.
This scheme is not recommended when using long lines since it will
cause a serious amount of signal distortion due to signal reflections in
several line-endings.
Figure C-2 Star structure
C-4 ADAM-5000