Bidirectional RS-485 Fan-Out Hub Reference Design


Design files


The Bidirectional RS-485 Fan-Out Hub Reference Design (TIDA-01365) documents and tests an RS-485 fan-out hub design where 1:N and N:1 RS-485 signals are aggregated in and out of any bus topology. This design also features automatic direction control, for reduced pin count on microcontrollers, and a DC-to-DC converter using the 24V DC rail typically seen in industrial applications.

  • Allows for bidirectional communication over complex network topologies
  • One master node / Four slave nodes
  • Direction of data automatically controlled (no MCU needed)
  • Supports cable lengths > 1000 m

A fully assembled board has been developed for testing and performance validation only, and is not available for sale.

Design files & products

Design files

Download ready-to-use system files to speed your design process.

TIDUCQ8.PDF (1535 K)

Reference design overview and verified performance test data


Detailed schematic diagram for design layout and components


Complete listing of design components, reference designators, and manufacturers/part numbers


Detailed overview of design layout for component placement


Files used for 3D models or 2D drawings of IC components

TIDCD56.ZIP (323 K)

Design file that contains information on physical board layer of design PCB


PCB layer plot file used for generating PCB design layout


Includes TI products in the design and potential alternatives.

RS-485 & RS-422 transceivers

SN65HVD3082EHalf-duplex RS-485 transceiver

Data sheet document-pdfAcrobat PDF open-in-new HTML
AND gates

SN74LV08A4-ch, 2-input, 2-V to 5.5-V AND gates

Data sheet document-pdfAcrobat PDF open-in-new HTML
Buck converters (integrated switch)

TPS54336A4.5V to 28V Input, 3A, Synchronous Step-Down Converter with Eco-mode(tm)

Data sheet document-pdfAcrobat PDF open-in-new HTML
Real-time clocks (RTCs) & timers

NA555Precision Timers

Data sheet document-pdfAcrobat PDF open-in-new HTML

Technical documentation

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Type Title Date
* Design guide RS-485 Bidirectional Fan-Out Hub With Automatic Direction Control Ref Design Feb. 06, 2017

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