# AGRINOVO-TVOC-100: RS485 TVOC & CO2eq Air Quality Sensor

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

## 1. Overview

The AGRINOVO-TVOC-100 is a digital indoor air quality sensor with an RS485 Modbus-RTU output. It measures total volatile organic compounds (TVOC) across 0-60000 ppb and reports equivalent CO2 (CO2eq), a 400-60000 ppm air quality index derived from the VOC signal. Both values arrive as simple Modbus registers over a single 4-wire connection.

The sensing element delivers high accuracy and consistency across a wide range, with strong stability and interference immunity, and built-in surge protection on the interface. Multiple sensors share one RS485 bus for monitoring several rooms or zones from a single controller, with cable runs up to 1200 m.

### Key Features

- TVOC: 0-60000 ppb
- CO2eq: 400-60000 ppm
- Resolution: 1 ppb / 1 ppm
- Accuracy from ±1 ppb / ±1 ppm
- RS485 Modbus-RTU output
- Bus runs up to 1200 m
- 5-12 V DC, <0.1 W
- Built-in surge protection

### Applications

- Greenhouse and indoor growing air quality
- Warehouses, cold rooms, and produce storage
- Packing, processing, and facility rooms
- Ventilation duct and HVAC monitoring
- Offices, labs, and equipment rooms

## 2. Specifications

| Parameter | Specification |
|:----------|:--------------|
| **TVOC Range** | 0-60000 ppb |
| **TVOC Accuracy** | ±1 ppb (0-2008 ppb), ±6 ppb (2008-11110 ppb), ±32 ppb (11110-60000 ppb) |
| **CO2eq Range** | 400-60000 ppm |
| **CO2eq Accuracy** | ±1 ppm (400-1479 ppm), ±3 ppm (1479-5144 ppm), ±9 ppm (5144-17597 ppm), ±31 ppm (17597-60000 ppm) |
| **Resolution** | 1 ppb TVOC, 1 ppm CO2eq |
| **Output** | RS485, Modbus-RTU |
| **Bus Length** | Up to 1200 m |
| **Supply Voltage** | 5-12 V DC |
| **Power Consumption** | <0.1 W |
| **Protection** | Built-in surge protection |
| **Placement** | Indoor, non-condensing |

CO2eq is an equivalent-CO2 air quality value calculated from the VOC measurement. For direct CO2 measurement, pair with a dedicated CO2 sensor.

## 3. Wiring

| Terminal | Function | Description |
|:---------|:---------|:------------|
| **V+** | Power | Power Supply (5-12 V DC) |
| **GND** | Ground | Power Ground |
| **A+** | RS485-A | Data+ |
| **B-** | RS485-B | Data- |

## 4. Communication Settings

| Parameter | Value |
|:----------|:------|
| **Protocol** | Modbus-RTU |
| **Baud Rate** | 9600 bps (default); 1200, 2400, 4800, 19200 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 (1-247).

## 5. Register Map

### Measurement Registers (Function 0x03 or 0x04)

| Address | Description | Unit |
|:--------|:------------|:-----|
| 0x0003 | TVOC | 1 ppb |
| 0x0004 | CO2eq | 1 ppm |

A register value of 0x8000 indicates a sensing element read error.

### Configuration Registers (Function 0x03/0x04 read, 0x06/0x10 write)

| Address | Description | Values |
|:--------|:------------|:-------|
| 0x0064 | Device Address | 1-247, default 1 |
| 0x0065 | Baud Rate | 0: 1200, 1: 2400, 2: 4800, 3: 9600, 4: 19200 |

## 6. Reading Data

Read TVOC and CO2eq (2 registers from 0x0003):

```
Request:  01 03 00 03 00 02 34 0B
Response: 01 03 04 00 7D 02 62 EA A2
```

**Decoding:**

| Value | Hex | Decimal | Result |
|:------|:----|:--------|:-------|
| TVOC | 0x007D | 125 | **125 ppb** |
| CO2eq | 0x0262 | 610 | **610 ppm** |

## 7. Address Configuration

### Change Address (0x01 → 0x02)

Write to register 0x0064:

```
01 06 00 64 00 02 49 D4
```

### Broadcast Discovery

With only one sensor on the bus, address 0xFF reads or writes regardless of the configured address. Read the current address:

```
FF 03 00 64 00 01 D0 0B
```

Set the address to 0x02 without knowing the current one:

```
FF 06 00 64 00 02 5C 0A
```

### Change Baud Rate (set 9600)

Write to register 0x0065:

```
01 06 00 65 00 03 D9 D4
```

## 8. Installation Notes

**Placement**

- Indoor use, at breathing or canopy height for the zone
- Keep away from heat sources, cold sources, and direct sunlight
- Do not expose to steam, mist, or condensation
- Allow free air circulation around the sensor

**Maintenance**

- Clean periodically in dusty environments
- Allow a warm-up period after power-on before trusting readings
- Verify readings periodically against a reference
- Check A/B wiring and addresses on comms faults

## Ordering Information

| Part number | Description |
|:------------|:------------|
| AGRINOVO-TVOC-100 | RS485 TVOC & CO2eq Air Quality 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.