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TP8485 485 module with protection and automatic transmit/receive determination

Overview

Almost all RS485 communication chips require pull-up/pull-down resistors to the RE and DE pins to determine the transmit/receive status of RS485 communication.
In project development, this would occupy a pin on the microcontroller. Therefore, a transistor is used in this circuit for level selection to determine the transmit/receive status. This transistor automatically selects the transmit/receive status based on the RX pin;

this has been verified.
The module's 5-pin connector is directly compatible with my designed serial port module and development board, and can be directly plugged into the 5-pin interface of my designed serial port module or development board.

Physical

demonstration and test results are provided.

PDF_Protected Automatic Send/Receive Module for 485 (TP8485).zip

Altium_Protected Auto-Deterministic Transmit/Receive Module (TP8485).zip

PADS_Protected Auto-Deterministic Transmit/Receive 485 Module (TP8485).zip

BOM_Protected Automatic Deterministic Transmit/Receive Module (TP8485).xlsx

91670

electronic

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Update:2026-03-28 02:58:54

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