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B-Links and RS485 Topology.

Issue

While RS485 requires a daisy chain topology, can b-Links be daisy chained along with b3 controller in the BCX segment.

Environment

  • MSTP
  • b3
  • B-Link
  • RS485

Cause

While RS485 requires a daisy chain topology, the addition of b-Links to a RS485 bus makes the limitations of bus wiring less clear.

Resolution

RS485 is an electrical standard. 

The key to understanding RS485 topology conformance is to understanding that each segment of the RS485 bus must have a daisy chain topology with the required termination resistors installed at each end of the segment.

The bus segment that runs from the BCX controller to inputs of several b-links and or b3 controllers would constitute one segment.  As long as this segment has a daisy chain topology with the proper termination resistors installed it conforms to the requirements of RS485 bus wiring.

Each outgoing leg off of any given b-Link constitutes one distinct and separate segment. As long as this segment has a daisy chain topology with the proper termination resistors installed it conforms to the requirements of RS485 bus wiring.

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