Advantech Adam 4000 Series - Page 389

Appendix E RS-485 Network E-3
Appendix E
Figure E-1 Daisychaining
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 a signal reflection in a several line
endings.
Figure E-2 Star structure