Advantech Data Acquisition Modules ADAM 4000 User Manual page 407

Advantech data acquisition modules user's manual
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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 a signal reflection in a several
line endings.
Random
This is a combination of daisychain and hierarchical structure
E-4 ADAM 4000 Series User's Manual
Figure E-2 Star Structure
Figure E-3 Random Structure

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