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Front of cylindrical RS485 temperature humidity sensor with wires and yellow label.-DFRobot product sku:SEN0438 image.
Angled shot of rs485 temperature humidity sensor with yellow cap showing cylindrical design and wiring details
Overhead shot of RS485 temperature humidity sensor in product kit with wires and PCB components
Angled shot of a gray cylindrical RS485 temperature humidity sensor with a textured golden surface.
Overhead shot of RS485 temperature humidity sensor wiring showing four colored cables for industrial interface connection
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RS485 Temperature & Humidity Sensor_8

RS485 Temperature & Humidity Sensor

$29.90
SKU: SEN0438
Volume Discount
  • $29.00 3+ items
  • $28.50 5+ items
  • $27.50 10+ items
High-precision RS485 sensor measures temperature (-40 to 120°C) and humidity (0-99.9% RH). It's waterproof, durable, and ideal for HVAC and automation applications.
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    IntroductionSpecificationDocumentsShipping List Review

    Introduction

    Industrial-Grade RS485 Temperature & Humidity Sensor (1200m Transmission). This sensor is designed for harsh environments where standard sensors fail. Unlike I2C/UART sensors that are limited to short distances (< 2m), this RS485 module utilizes the standard Modbus RTU protocol to transmit stable data up to 1200 meters. Fully wrapped in a waterproof aluminum alloy shell, it is the ideal solution for greenhouse monitoring, warehouse management, and HVAC automation.

    RS485 Temperature & Humidity Sensor

    RS485 Temperature & Humidity Sensor


    ⚠️ Project Scope Check

  • Wiring distance < 2 meters? Save time and money, check our [Gravity: SHT31-F Digital Temperature and Humidity Sensor]. It's plug-and-play for simple projects.
  • Wiring distance > 10 meters? Or need to daisy-chain multiple sensors? You are on the right page. This is the professional choice for long-distance stability.


    • Hardware Setup Guide (Required Accessories)

    Since this sensor outputs raw RS485 signals, it cannot be connected directly to a microcontroller's GPIO or a PC's USB port.

  • For PC Debugging: You need a [USB to RS485 Converter].
  • For Arduino / ESP32: You need an [RS485 Shield].
  • Power Supply: Requires 12V~36V DC external power (standard 5V from Arduino is insufficient).


    • Technical Quick Reference

    We have extracted the key parameters from the manual for your quick setup:

  • Protocol: Standard MODBUS RTU
  • Baud Rate: 9600 (Default)
  • Wire Sequence: Yellow: RS485 A, White: RS485 B, Red: Power Input (12-36V), Black: GND

    • Pinout of Industrial-Grade RS485 Temperature & Humidity Sensor

    Wiring Diagram of Industrial-Grade RS485 Temperature & Humidity Sensor

    Figure: Pinout & Wiring Diagram of Industrial-Grade RS485 Temperature & Humidity Sensor

    Specification

  • Temperature Measurement Range: -40 ~ 120℃
  • Humidity Measurement Range: 0 ~ 99.9%RH
  • Temperature Accuracy: ± 0.3°C (25°C)
  • Humidity Accuracy: ± 2%RH (25℃)
  • Sampling Cycle Period: 3 sec
  • Power Supply Voltage: 12 ~ 36V (DC)
  • Product Size: 200mm(L) × 15.7mm(D) / 7.87×0.62”
  • Output Signal: RS485 signal
  • Communication Protocol: standard MODBUS RTU protocol
  • Baud Rate: 9600 (default)
  • Display Resolution: Temperature: 0.1℃; Humidity: 1%RH
  • Product Net Weight: 110.0g
  • Sensitivity Attenuation Value: temperature＜0.1℃/year; humidity＜0.5%RH/year
  • Wire Sequence: yellow wire - RS485 A; red wire - power input; black wire - GND; white wire - RS485 B

    • Documents

    Shipping List

  • RS485 Temperature Humidity Sensor x1

    • Review

    Krizle.Santos Dec 13, 2025

    the sensor is good and accurate

    Senior.Vova Apr 22, 2025

    Simple configure and easy for use

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    RS485 Temperature & Humidity Sensor
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