Reference Design for Converting RS-232 Signaling to RS-485 Signaling
TIDA-060008
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Key Document

Description

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

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Schematic/Block Diagram

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Design Guide

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Design Files

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TI Devices (7)

Order samples, get tools and find more information on the TI products in this reference design.

Part Number Name Product Family Sample & Buy Design Kits & Evaluation Modules
ISOW7842  High-efficiency, low-emissions, reinforced digital isolator with integrated power  Isolation  Sample & Buy View Design Kits & Evaluation Modules
SN74LVC1G123  Single Retriggerable Monostable Multivibrator with Schmitt-Trigger Inputs  Specialty logic  Sample & Buy View Design Kits & Evaluation Modules
THVD1410  3.3-V to 5-V RS-485 transceiver with ±18-kV IEC ESD protection  Interface  Sample & Buy View Design Kits & Evaluation Modules
TRS3232E  3-V to 5.5-V Multichannel RS-232 Line Driver/Receiver With +/-15-kV ESD Protection  Interface  Sample & Buy Not Available
TRS3243E  3-V to 5.5-V Multichannel RS-232 Line Driver/Receiver With +/-15-kV IEC ESD Protection  Interface  Sample & Buy Not Available
TRS3318E  2.5-V 460-Kbps RS-232 Transceiver With +/-15-kV ESD Protection  Interface  Sample & Buy Not Available
TRS3386E  RS-232 Transceiver With Split Supply Pin for Logic Side  Interface  Sample & Buy Not Available

CAD/CAE symbols

Part # Package | Pins CAD File (.bxl) STEP Model (.stp)
ISOW7842 Download Download
SN74LVC1G123 Download Download
Download Download
Download -
THVD1410 Download Download
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TRS3232E Download -
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TRS3243E Download Download
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TRS3318E Download Download
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TRS3386E Download Download
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Step 2: Download the Symbol and Footprint from the CAD.bxl file table.


Technical Documents

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User guides (1)
Title Type Size (KB) Date
PDF 5286 17 Sep 2018
Design files (6)
Title Type Size (KB) Date
ZIP 1858 17 Sep 2018
PDF 458 17 Sep 2018
PDF 101 17 Sep 2018
ZIP 1688 17 Sep 2018
PDF 56 17 Sep 2018
PDF 180 17 Sep 2018

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