# AGRINOVO-THS-100: RS485 Temperature & Humidity Sensor

Agrinovo technical datasheet, revision 1.2 (October 2026).
PDF version: https://agrinovo.io/datasheets/sensors/AGRINOVO-THS-100_Datasheet.pdf

## 1. Overview

The AGRINOVO-THS-100 is a compact digital temperature and humidity sensor with an RS485 Modbus-RTU output. The measuring element and transmitter electronics are built into the probe itself, so a single 4-wire cable carries both power and data. One sensor model covers every climate-monitoring point on a site: the probe is available in seven interchangeable housings, from a fast-response vented cap for indoor air to sealed, sintered-metal, and IP67 options for wet, dusty, and harsh environments.

Wide-range 5-28 V DC supply, reverse-polarity protection, and industrial EMC-hardened electronics make it a straightforward fit for long cable runs and multi-sensor RS485 buses.

### Key Features

- Temperature: -40 to +80°C, ±0.3°C
- Humidity: 0-100% RH, ±3% RH
- 0.1°C / 0.1% RH resolution
- 2 s measurement refresh
- RS485 Modbus-RTU output
- Seven probe housing options
- 5-28 V DC, ≤0.05 W
- Reverse-polarity protected

### Applications

- Greenhouse and indoor growing climate control
- Poultry, cattle, and livestock housing
- Grain storage and silo headspace monitoring
- Hatchery and aquaculture room climate
- Cold rooms, warehouses, and storage facilities

## 2. Specifications

| Parameter | Specification |
|:----------|:--------------|
| **Temperature Range** | -40 to +80°C |
| **Temperature Accuracy** | ±0.3°C (at 25°C) |
| **Temperature Resolution** | 0.1°C |
| **Humidity Range** | 0-100% RH (non-condensing) |
| **Humidity Accuracy** | ±3% RH (at 60% RH, 25°C) |
| **Humidity Resolution** | 0.1% RH |
| **Response Time** | ≤15 s temperature, ≤4 s humidity (1 m/s airflow) |
| **Measurement Refresh** | 2 s |
| **Long-term Stability** | ≤0.1°C/year, ≤1% RH/year |
| **Output** | RS485, Modbus-RTU |
| **Supply Voltage** | 5-28 V DC |
| **Power Consumption** | ≤0.05 W |
| **Protection** | Reverse-polarity protection on supply |
| **Cable** | 4-wire, 1 m standard |

## 3. Probe Options

The THS-100 electronics are identical across all housings. Select the probe housing for the environment; specifications and communication are the same for every option.

| Ordering Code | Housing | Dimensions | Environment |
|:--------------|:--------|:-----------|:------------|
| **THS-100-PVC** | Vented PVC cap | Ø12.5 × 68 mm | Indoor air; fastest response; not waterproof |
| **THS-100-PP** | Sealed polymer | Ø15 × 67 mm | High humidity and outdoor; rain and fog |
| **THS-100-BR** | Brass body | Ø15 × 68 mm | High humidity and outdoor; rain and fog |
| **THS-100-SS** | Stainless steel body | Ø15 × 76 mm | High humidity and outdoor; rain and fog |
| **THS-100-SM57** | Sintered metal filter | Ø14 × 57 mm | High-dust areas; fast response |
| **THS-100-SM87** | Sintered metal filter, long | Ø14 × 87 mm | High-dust areas |
| **THS-100-IP67** | IP67 sintered housing | Ø16.5 × 74 mm | Harsh and washdown environments |

Response time is specified with the vented PVC cap. Sealed and sintered housings protect the element in wet and dusty conditions and respond more gradually to fast humidity changes.

## 4. Wiring

| Wire Color | Function | Description |
|:-----------|:---------|:------------|
| **Red** | V+ | Power Supply (5-28 V DC) |
| **Black** | GND | Power Ground |
| **Yellow** | RS485-A | Data+ |
| **Green** | RS485-B | Data- |

Do not swap the A and B data lines. On long runs or buses with many devices, power the sensors locally and fit a 120 Ω termination resistor at the end of the bus.

## 5. Communication Settings

| Parameter | Value |
|:----------|:------|
| **Protocol** | Modbus-RTU |
| **Baud Rate** | 9600 bps (default); 2400, 4800 selectable |
| **Data Bits** | 8 |
| **Parity** | None |
| **Stop Bits** | 1 |
| **Error Check** | CRC-16 |
| **Default Address** | 0x01 |

Multiple sensors share one RS485 bus, each with a unique address (1-254). Bus length up to 2000 m with proper cabling and termination.

## 6. Register Map

### Measurement Registers (Function 0x03)

| Address | Description | Scaling |
|:--------|:------------|:--------|
| 0x0000 | Humidity | Value ÷ 10 (% RH) |
| 0x0001 | Temperature | Value ÷ 10 (°C), two's complement below 0°C |

### Configuration Registers (Function 0x03 read / 0x06 write)

| Address | Description | Values |
|:--------|:------------|:-------|
| 0x0100 | Device Address | 1-254, default 1 |
| 0x0101 | Baud Rate | 2: 2400, 3: 4800, 4: 9600 |
| 0x0104 | Temperature Offset | Value ÷ 10 (°C), two's complement |
| 0x0105 | Humidity Offset | Value ÷ 10 (% RH), two's complement |

## 7. Reading Data

Read humidity and temperature (2 registers from 0x0000):

```
Request:  01 03 00 00 00 02 C4 0B
Response: 01 03 04 01 E6 FF 9F 1B A0
```

**Decoding:**

| Value | Hex | Decimal | Scaling | Result |
|:------|:----|:--------|:--------|:-------|
| Humidity | 0x01E6 | 486 | ÷10 | **48.6% RH** |
| Temperature | 0xFF9F | -97 | ÷10 | **-9.7°C** |

Negative temperatures are transmitted in two's complement: 0xFF9F = -97, giving -9.7°C.

## 8. Configuration

### Change Address (0x01 → 0x02)

Write to register 0x0100:

```
01 06 01 00 00 02 09 F7
```

> **Note:** Communication resumes on the new address.

### Change Baud Rate (set 9600)

Write to register 0x0101:

```
01 06 01 01 00 04 D8 35
```

### Offset Adjustment

Field-trim readings against a reference by writing an offset. Example, temperature offset of -0.5°C (0xFFFB) to register 0x0104:

```
01 06 01 04 FF FB C9 84
```

Humidity offset works the same way through register 0x0105.

## 9. Installation Notes

**Placement**

- Match the probe housing to the environment (Section 3)
- Mount away from direct sunlight, heaters, and vents
- Use a radiation shield for outdoor ambient readings
- Allow free air circulation around the probe

**Maintenance**

- Keep the filter cap clean and unblocked
- Avoid condensation on the vented PVC option
- Verify readings periodically against a reference
- Check A/B wiring and termination on comms faults

## Ordering Information

| Part number | Description |
|:------------|:------------|
| AGRINOVO-THS-100 | RS485 Temperature & Humidity Sensor |

## Revision History

| Rev | Date | Changes |
|:----|:-----|:--------|
| 1.0 | June 2026 | Initial release |
| 1.1 | August 2026 | Layout revision |
| 1.2 | October 2026 | New layout |

## Contact

Agrinovo, https://agrinovo.io/products, contact@agrinovo.io, +972 54 688 8148 (direct / WhatsApp).
Specifications subject to change without notice.