TIDA-00862

RS-485 Full Duplex Over Two Wires Reference Design

TIDA-00862

Design files

Overview

The design enables full duplex RS-485 communications over a single pair of conductors rather than four by utilizing bus contention. By adding small-valued serial resistors to the bus lines to limit currents, a tri-stated differential bus is allowed and the SN65HVD96 SymPol transciver can be used to detect a state of bus contention. Simple digital logic and analog filtering techniques enable both transceivers to drive and receive from eachother simultaneously without the need for 2 additional bus wires.

Features
  • Full duplex differential signaling
  • Up to 1Mbps data rate
  • Requires only two bus wires
  • Physical level implementation
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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.

TIDUBH8.PDF (2502 K)

Reference design overview and verified performance test data

TIDRKP8.PDF (98 K)

Detailed schematic diagram for design layout and components

TIDRKP9.PDF (198 K)

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

TIDRKQ0.PDF (181 K)

Detailed overview of design layout for component placement

TIDRKQ2.ZIP (835 K)

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

TIDCBW7.ZIP (70 K)

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

TIDRKQ1.PDF (193 K)

PCB layer plot file used for generating PCB design layout

Products

Includes TI products in the design and potential alternatives.

RS-485 & RS-422 transceivers

SN65HVD3086ELow-Power RS-485 Full-Duplex Drivers/Receivers

Data sheet: PDF | HTML
RS-485 & RS-422 transceivers

SN65HVD96SymPol Transceiver

Data sheet: PDF
Configurable gates

SN74LVC1G97Configurable Multiple-Function Gate

Data sheet: PDF | HTML
Inverting buffers & drivers

SN74LVC1G04Single 1.65-V to 5.5-V inverter

Data sheet: PDF

Technical documentation

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Type Title Date
* Design guide Full Duplex RS-485 Over Two Wires Design Guide Feb. 10, 2016

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