DTC3-RH
Remote Humidity & Temperature Sensor

Bidirectional LoRa sensor with RS-485 Modbus relay bridge. Monitor humidity and temperature at remote grain stores while controlling aeration fans — all wirelessly.

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DTC-3 Controller

2km+

Bidirectional LoRa Range

±2%

Relative Humidity Accuracy

RS-485

Modbus Relay Bridge

24V DC

Industrial Power Supply

Sense. Communicate. Control.

The DTC3-RH extends your DTC3 controller to remote locations — measuring humidity and temperature where it matters, while bridging relay commands to fan starters at the far end of the farm.

Why Choose the DTC3-RH?

💧

Precision Humidity Sensing

Our sensor measures relative humidity to ±2% accuracy across 0–100% RH, enabling humidity-based aeration decisions that prevent condensation and mould.

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Bidirectional LoRa

Unlike one-way probes, the DTC3-RH uses Protocol 2.0 with request/response handshake. Send sensor data out, receive relay commands back — all over the air.

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RS-485 Modbus Bridge

Connects to the DTC3-RR remote relay board via Modbus, forwarding fan control commands from the DTC3 controller without running long control cables.

Remote Fan Monitoring

Reads fan running, trip/fault, and auto/manual status from the DTC3-RR and transmits it back to the controller in real time. Status changes trigger immediate updates.

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WiFi Configuration

Built-in WiFi access point for configuration from any phone or laptop. Adjust transmit intervals, enable/disable sensors, and trigger manual transmissions.

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Over-the-Air Updates

OTA built in. Update firmware wirelessly via the configuration interface — no USB cable or disassembly required.

The Wireless Bridge Between Controller and Fan

Replace long control cable runs with a DTC3-RH at the remote store. It reads the environment, reports back to the DTC3 controller, and forwards relay commands to the existing preinstalled fan controls via the DTC3-RR — all via LoRa and Modbus.

How It Works

1

Sense

The advanced sensor continuously measures temperature and relative humidity at the remote grain store location.

2

Transmit

Sensor data and remote I/O status are packaged into a LoRa packet and sent to the DTC3 controller at your chosen interval.

3

Receive

The DTC3 controller responds with relay control commands based on its differential logic and your configured setpoints.

4

Control

Relay commands are forwarded via RS-485 Modbus to the DTC3-RR relay board, switching the aeration fan on or off.

Three Operating Modes

Standalone Sensor Mode

Use the DTC3-RH purely as a remote humidity and temperature sensor without the DTC3-RR relay board.

  • Temperature & humidity monitoring
  • LoRa transmission to DTC3 controller
  • WiFi configuration interface
  • No Modbus polling (disable to prevent timeouts)
  • Ideal for environmental monitoring locations

Bridge Mode (with DTC3-RR)

Full bidirectional operation: sense, report, and control remote fan starters via the DTC3-RR relay board.

  • Everything in Standalone mode, plus:
  • RS-485 Modbus polling of DTC3-RR every 250ms
  • Fan running, trip, and auto/manual status reporting
  • Relay control command forwarding from controller
  • Instant transmission on status change

Technical Specifications

MCUESP32-S3 Dual-Core
RadioLoRa 868MHz (Bidirectional)
ProtocolDTC3 Protocol 2.0
TX Power20 dBm
Range2km+ line-of-sight
Power Supply24V DC (100-240Vac optional)
RS-485Modbus Master
WiFi2.4 GHz AP (configuration)
Operating Temp-20°C to +60°C
FirmwareDTC3-RH v2.1

Part of the Store Guardian Ecosystem

The DTC3-RH works with the DTC3 Controller, DTC3-WP wireless probes, DTC3-RR remote relay board, and DTC3-Cloud gateway to deliver complete grain storage monitoring and control from field to cloud.

Ready to Add Humidity Control?

Contact Tryac