The 7Semi Industrial RS485 Temperature & Humidity Sensor Probe is an industrial-grade sensor engineered for precision and durability in demanding environments. Leveraging Modbus RTU over RS485, it delivers highly accurate readings with excellent long-term stability. Housed in a robust stainless steel probe with a breathable, waterproof, and dust-resistant sintered metal filter, it’s ideal for HVAC systems, building automation, climatology, and industrial monitoring.

This version includes a 2-meter, features a wide 9–36V DC input range, DIP switch-configurable Modbus address and baud rate, and onboard signal processing. Fully plug-and-play with SCADA, PLCs, HMIs, and Arduino/MCUs.

Key Features

RS485 Modbus RTU Output (Standard Protocol)
Temperature Range: -40°C to +125°C
Humidity Range: 0% RH to 100% RH
High Accuracy: ±0.1°C (Temp), ±1.5% RH (Humidity) at 25°C
Wide Input Voltage: 9V–36V DC
DIP switch for Modbus ID & Baud Rate Configuration
Easy 4-wire Connection: VCC, GND, RS485 A+, RS485 B−

Wiring Guide

Applications

HVAC control and ventilation
Building automation systems (BAS)
Data centers and server rooms
Museums, archives & climate control rooms
Industrial plants and process monitoring
Smart agriculture and greenhouses
Weather stations and environmental sensing

Frequently Asked Questions (FAQ)

Q1: Is the sensor compatible with PLCs and SCADA systems?
Yes, the sensor uses RS485 with Modbus RTU, compatible with most industrial automation systems.

Q2: How do I read the sensor values?
Use Modbus function code 0x03 to read two 16-bit registers. Divide by 10 to get the actual values in °C and %RH.

Q3: How is the device configured?
You can set the Modbus address (1–255) and baud rate using onboard DIP switches. Supported baud rates include 9600, 19200, 38400, and 115200.

Q4: Can I interface this with Arduino?
Absolutely. It includes a sample Arduino wiring and code setup using RS485 to TTL adapters.