RS485 Industrial Grade Temperature & Humidity Sensor Probe -7Semi

🔍 What this sensor is
The RS485 Industrial Grade Temperature & Humidity Sensor Probe (7Semi) is a professional industrial sensor used to measure:
🌡️ Temperature
💧 Humidity
👉 Unlike Arduino sensors, this is designed for:
🏭 Industrial automation
🏢 Building management systems
🌾 Smart agriculture
🧠 Core Concept (VERY IMPORTANT)
👉 This is NOT a simple sensor like SHT41
It uses:
RS485
Modbus RTU
➡️ Meaning:
Data is sent digitally over long distance
Can connect to PLC, SCADA, industrial systems
⚙️ Key Specifications
Temperature Range: -40°C to +125°C
Humidity Range: 0–100% RH
Accuracy:
±0.1°C (Temp)
±1–1.5% RH
Output: RS485 (Modbus RTU)
Power Supply: 9V–36V DC (some up to 60V)
Cable Length: ~2 meters
Resolution: 0.1°C / 0.1% RH
⚡ How it works
Internal sensor (often SHT45 class) measures temp & humidity
Data processed inside module
Sent via RS485 digital communication
👉 You read values using:
Modbus commands
Registers (example: function code 0x03)
🔌 Wiring (IMPORTANT)
4-wire connection:
VCC → 9–36V DC
GND → Ground
A+ → RS485 Data+
B- → RS485 Data−
👉 To connect with Arduino:
Use RS485 to TTL converter module
🧠 Key Features
✔️ Industrial-grade accuracy & stability
✔️ Long-distance communication (up to ~1200m)
✔️ Noise-resistant (very important in factories)
✔️ Waterproof, dust-proof metal probe
✔️ Plug-and-play with PLC/SCADA
💡 Applications
🏭 Industrial process monitoring
🏢 HVAC systems
🌾 Smart agriculture / greenhouse
🖥️ Data centers
🏛️ Museums & storage rooms
🌦️ Weather stations
⚠️ Important Notes (VERY IMPORTANT)
❗ 1. Not beginner-friendly
Requires:
RS485 module
Modbus communication
👉 More complex than I2C sensors
❗ 2. Needs controller (PLC/MCU)
Cannot work standalone
Needs:
PLC / Arduino / Raspberry Pi
❗ 3. Power requirement is higher
Needs 9–36V, not 3.3V like normal sensors
❗ 4. Address configuration
Uses Modbus ID (1–255)
Configurable via DIP switch or software
🆚 RS485 Sensor vs I2C Sensor (SHT41)
Feature
RS485 Sensor
SHT41
Use
Industrial
IoT / hobby
Distance
⭐ Long (1000m+)
Short
Protocol
Modbus
I2C
Accuracy
High
High
Complexity
❌ High
✅ Easy
👍 When to use this
Use RS485 probe if you want:
Industrial automation
Long-distance sensing
Reliable outdoor/harsh environment monitoring
Integration with PLC / SCADA
👎 When NOT to use
Avoid if:
Beginner Arduino project
Small IoT device
Battery-powered system
🧠 Final Understanding
👉 This sensor = “industrial-grade remote temperature & humidity transmitter”
👉 Built for real-world deployment, not just prototyping