Temperature and Humidity Sensor with ModBus
| SKU | PP-THMODBUS |
|---|---|
| Product line | PIERRE Pro |
| Category | Sensors / Temperature & Humidity sensors |
| Manufacturer | SHENZHEN HAODU TECHNOLOGY CO., LTD |
| GTIN / EAN | 8606034720529 |
| HS code | 9032102000 |
Overview
The PIERRE Pro Temperature and Humidity Sensor with ModBus operates on 5-24V DC, measuring temperatures from -40°C to 120°C. It integrates seamlessly into PIERRE Smart Home System via Modbus, allowing centralized control and real-time monitoring. The sensor continuously measures environmental temperature and humidity, communicating the data via the Modbus protocol for centralized control.
Its waterproof design ensures reliable performance in outdoor or demanding conditions. Multiple mounting options make installation flexible, optimizing environmental management for both indoor and outdoor spaces.
Key features
5-24V DC input, temperature range -40°C to 120°C,waterproof, maximum power consumption 0.05W, temperature accuracy ±0.2℃, humidity accuracy ±3% RH, suitable for high-temperature applications, 0.1℃ temperature resolution, 0.1% RH humidity resolution, 1-meter line length.
Technical specifications
| Electrical | |
|---|---|
| Power Supply | DC 5-24V |
| Connectivity | |
| Connectivity | Modbus |
| Physical | |
| Product Color | Black |
| Environmental | |
| Operating Temperature (°C) | -40 ～ +120 |
| Operating Temperature | -40°F ～ +248°F |
| Operating Humidity | 0% - 100% RH % RH |
| IP Rating | IP20 |
| Safety | |
| Safety Features | Overload protection, Reverse polarity protection, Anti-flammable housing, Electrostatic protection |
| Sensors | |
| Built-in Sensors | Temperature, Humidity |
| Humidity Accuracy | ±3.00% |
| Temperature Accuracy | ±0.20°C |
Pin layout
| Pin | Label | Type | Position |
|---|---|---|---|
| 1 | 12V+ | power_12V_input | top |
| 2 | GND | power_gnd_in | top |
| 3 | A+ | rs485_a_in | top |
| 4 | B- | rs485_b_in | top |
Physical & packaging
| Dimensions (L × W × H) | – × 87 × 14 mm |
|---|---|
| Weight | 10 g |
| Box dimensions (L × W × H) | 87 × 87 × 14 mm |
| Box weight | 10 g |
User manual
1. Dimensions
- W: 14 mm
- H: 87 mm
2. What you need
Wired. Needs a PIERRE PRO Controller, a TTL to RS-485 converter and the Temperature and Humidity Sensor with ModBus.
3. Wiring
- Connect the TTL converter’s VCC terminal to the +5 V output of the PIERRE Controller.
- Connect the TTL converter’s GND terminal to the 5 V GND terminal of the Controller.
- Connect the converter’s RXD and TXD terminals to two configurable inputs/outputs of the Controller, as shown in the diagram.
- Connect the converter’s A+ and B− terminals to the sensor’s A+ and B− wires.
- Connect the sensor’s power wires to +12 V and GND.
| Run | Wires | Cross-section | Cable type | Conductors |
|---|---|---|---|---|
| From TTL converter to PIERRE Controller | 4 | 0.2 mm² (24 AWG) | Cat 5 U/UTP | +5 V, GND, TXD, RXD |
| From TTL converter to sensor (bus) | 2 | 0.75 mm² | Shielded twisted pair | A+, B− |
Connections
- Connect the TTL converter’s VCC terminal to the +5 V output of the PIERRE Controller.
- Connect the TTL converter’s GND terminal to the 5 V GND terminal of the Controller.
- Connect the converter’s RXD and TXD terminals to two configurable inputs/outputs of the Controller, as shown in the diagram.
- Connect the converter’s A+ and B− terminals to the sensor’s A+ and B− wires.
- Connect the sensor’s power wires to +12 V and GND.
Controller to converter: one run, four conductors (+5 V, GND, TXD and RXD) on a single Cat 5 U/UTP cable, maximum length 100 m. Converter to sensor: the RS-485 pair A+ and B−. Do not run the data cable alongside high-voltage cable.
4. Sensor setup via App
- Choose Controller
- Tap on the Controller that you would like to add new I/O to.
- To edit the I/O, click on the Controller to which the I/O is added.
- Configurable I/O - list
- Tap on the Configurable I/O tab.
- Add button - Configurable I/Os
- Tap on the Add button.
- Choose type - Configurable I/O list
- You should choose the type of the I/O from the list that you would like to add.
- New Temperature sensor - DS18B20
- Fill the following form:
- Name - Write the name of the Temperature sensor.
- Roles - Select the Role from the list.
- Pin - Choose Pin. It is physical place on the Controller where I/O is connected to it.
- Identifier - Enter the identifier of the I/O in the electrical project in this field.
- Address - Tap on +/-.
- Fill the following form:
- Select Roles
- You can select desired Role or Roles - multiple choice if you tap on the checkboxes next to them.
- Tap on Save/Done.
- Choose PIn
- Tap on the radio button next to the Pin that you would like to choose.
- To confirm selection tap on Save/Done.
5. FAQ
Q1: When should input and output be on the same controller?
If one input influences an output, both should be added to the same controller. A motion sensor triggering a lamp, for example, performs best when both sit on the same controller.
Q2: What are configurable IOs?
The Configurable I/O pins on the PIERRE Controller PRO carry digital sensor and control signals, for example the DS18B20 temperature sensor, the BH1750 brightness sensor and 0–10 V control.
Q3: Where should the sensor be installed?
At eye level, away from draughts and external walls.
Q4: How many sensors do I need?
At least one for basic heating or cooling control. In practice, one per zone or room where you want individual control.
Q5: Does it need calibrating?
Not always necessary, but often useful. Skip it if the sensor is factory-calibrated to ±0.5 °C or better, the application is ordinary comfort heating or cooling, and the mounting position is good. Calibrate if the reading disagrees with a reference thermometer, if the sensor sits where electronics, sunlight or poor airflow affect it, or if the system needs precise control. In the Smart PIERRE app calibration is optional — the offset is there so you can fine-tune it.