TIDA-060008

Reference Design for Converting RS-232 Signaling to RS-485 Signaling

TIDA-060008

Design files

Overview

This reference design provides a circuit of converting RS-232 signaling to RS-485 signaling. This allows for long-distance communication, since the range supported by RS-232 is normally less than 50 feet while the range for RS-485's can exceed 1000 feet. The design implements bidirectional half-duplex communication without any software interference.

Features
  • Convert RS-232 to RS-485 signaling for bidirectional half-duplex communication without any software interference with hot plug-in feature
  • Low voltage design. The design works with both 3.3-V and 5-V supply
  • Industrial-level ESD protection
    • RS-232 port: IEC 61000-4-2, ±8 kV contact, ±15 kV air
    • RS-485 port: IEC 61000-4-2, ±30 kV contact, ±30 kV air; EFT, IEC 61000-4-4, 50 A; Surge, IEC 61000-4-5, 19 A
    • Isolation: 5000 Vrms isolation protection
  • Extend system topology from point-to-point to multi-drop
  • Cable length up to 1000 ft

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.

TIDUEI7.PDF (5286 K)

Reference design overview and verified performance test data

TIDRX40.PDF (180 K)

Detailed schematic diagram for design layout and components

TIDRX41.PDF (56 K)

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

TIDRX43.PDF (101 K)

Detailed overview of design layout for component placement

TIDRX42.ZIP (1688 K)

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

TIDCEV9.ZIP (1858 K)

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

TIDRX44.PDF (458 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

THVD14103.3-V to 5-V RS-485 transceiver with ±18-kV IEC ESD protection

Data sheet document-pdfAcrobat PDF open-in-new HTML
Monostable multivibrators (one-shots)

SN74LVC1G123Single retriggerable monostable multivibrator with Schmitt-trigger inputs

Data sheet document-pdfAcrobat PDF open-in-new HTML
RS-232 transceivers

TRS3221E3- to 5.5-V single channel 250kbps RS-232 line driver/receiver with +/-15-kV IEC-ESD protection

Data sheet document-pdfAcrobat PDF open-in-new HTML
RS-232 transceivers

TRS3232E3- to 5.5-V dual channel 250kbps RS-232 line driver/receiver with +/-15-kV IEC-ESD protection

Data sheet document-pdfAcrobat PDF open-in-new HTML
RS-232 transceivers

TRS3243E3- to 5.5-V multichannel 600kbps RS-232 line driver/receiver with +/-15-kV IEC-ESD protection

Data sheet document-pdfAcrobat PDF
RS-232 transceivers

TRS3318E2.5-V dual channel 460kbps RS-232 line driver/receiver with +/-8-kV IEC-ESD protection

Data sheet document-pdfAcrobat PDF
RS-232 transceivers

TRS3386E3- to 5.5-V 250kbps RS-232 line driver/receiver with logic supply pin & +/-15-kV IEC-ESD protection

Data sheet document-pdfAcrobat PDF
RS-232 transceivers

TRSF3221E3- to 5.5-V single channel 1Mbps RS-232 line driver/receiver with +/-15-kV IEC-ESD protection

Data sheet document-pdfAcrobat PDF open-in-new HTML
RS-232 transceivers

TRSF3232E3- to 5.5-V dual channel 1Mbps RS-232 line driver/receiver with +/-15-kV IEC-ESD protection

Data sheet document-pdfAcrobat PDF open-in-new HTML
Signal isolators with integrated power

ISOW7842Quad-channel, 2/2, reinforced digital isolator with integrated power

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

Technical documentation

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Type Title Date
* Design guide Reference Design for Converting RS-232 Signaling to RS-485 Signaling Sep. 17, 2018

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