# AGRINOVO-DO-110: Dissolved Oxygen Sensor

Agrinovo technical datasheet, revision 1.2 (October 2026).
PDF version: https://agrinovo.io/datasheets/sensors/AGRINOVO-DO-110_Datasheet.pdf

## 1. Overview

The AGRINOVO-DO-110 is a digital dissolved oxygen sensor using RS485 Modbus-RTU protocol. It provides DO concentration and temperature readings with salinity compensation capability. Data is returned as little-endian float32 values.

### Key Features

- DO range: 0 to 20 mg/L
- Temperature: 0 to 50°C
- IP68 waterproof rating
- Little-endian float32 data
- Salinity compensation (ppt)
- Pressure compensation (kPa)
- RS485 Modbus-RTU
- 12-24V DC power supply

### Applications

- Aquaculture monitoring
- Water quality analysis
- Environmental monitoring
- Industrial process control

## 2. Specifications

| Parameter | Specification |
|:----------|:--------------|
| **DO Range** | 0 to 20 mg/L |
| **Temperature Range** | 0 to 50°C |
| **Protection Rating** | IP68 |
| **Supply Voltage** | 12-24 VDC |

### Compensation

| Type | Method |
|:-----|:-------|
| Temperature | Automatic |
| Salinity | Manual input (ppt) |
| Pressure | Manual input (kPa) |

## 3. Wiring

| Wire Color | Function | Description |
|:-----------|:---------|:------------|
| **Black** | V- | Power Ground (12-24V DC-) |
| **Red** | V+ | Power Supply (12-24V DC+) |
| **Yellow/White** | RS485-A | Data+ |
| **Green** | RS485-B | Data- |

> **Note:** If your RS485 transceiver labels A/B opposite, swap the connections.

## 4. Communication Settings

| Parameter | Value |
|:----------|:------|
| **Protocol** | Modbus-RTU |
| **Baud Rate** | 9600 bps |
| **Data Bits** | 8 |
| **Parity** | None |
| **Stop Bits** | 1 |
| **Default Address** | 0x01 |

## 5. Register Map

### Data Encoding

DO and Temperature values are **float32** in **little-endian byte order**.

### Measurement Registers (Function 0x03)

| Address | Registers | Description |
|:--------|:----------|:------------|
| 0x0000 | 4 | DO (float32) + Temperature (float32) |
| 0x000A | 2 | Production Serial Number |
| 0x0010 | 1 | Slave Address (via 0xFF request) |
| 0x0011 | 2 | Field Calibration Parameter |
| 0x0062 | 1 | Salinity (ppt, integer) |

### Configuration Registers (Function 0x10)

| Address | Description | Notes |
|:--------|:------------|:------|
| 0x0010 | Set Slave Address | Range: 1 to 247 |
| 0x0011 | Field Calibration | Pressure in 0.01 kPa |
| 0x0021 | Cancel Field Calibration | Write 0x1400 |
| 0x0062 | Set Salinity | Value in ppt |

## 6. Reading Data

### Read DO + Temperature (Float)

Read 4 registers from 0x0000:

```
Request:  01 03 00 00 00 04 44 09
Response: 01 03 08 48 E1 0A 41 F6 28 B4 41 59 5A
```

**Decoding (Little-endian float32):**

| Value | Bytes Received | Reordered | Result |
|:------|:---------------|:----------|:-------|
| DO | 48 E1 0A 41 | 41 0A E1 48 | **8.68 mg/L** |
| Temperature | F6 28 B4 41 | 41 B4 28 F6 | **22.52°C** |

## 7. Address Configuration

### Read Current Address (Using 0xFF)

```
Request:  FF 03 00 10 00 01 90 11
Response: FF 03 02 03 00 91 60
```

Response shows current address = 0x03

### Set New Address

Write to 0x0010 using function 0x10:

```
01 10 00 10 00 01 02 14 00 AB C0
```

## 8. Calibration

### Field Calibration (Pressure)

Place probe in air-saturated DO, wait for stability. Write pressure to 0x0011.

Pressure: kPa × 100 (e.g., 101.33 kPa = 10133 = 0x2795)

```
01 10 00 11 00 01 02 95 27 8A 5B
```

### Cancel Field Calibration

Write 0x1400 to register 0x0021:

```
01 10 00 21 00 01 02 14 00 AF E1
```

## 9. Maintenance

- Calibration interval depends on the water type and the amount of biofouling and algae. Under normal conditions, calibrate every 6-8 months.
- Clean the membrane cap regularly between calibrations.
- The membrane cap is replaceable, typically after 2+ years of use.

## Ordering Information

| Part number | Description |
|:------------|:------------|
| AGRINOVO-DO-110 | Dissolved Oxygen 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.