# C02 Del. Total

### Definition

Set the flow meter’s totalizer to zero manually. Default: No. 

### Notes

N/A

### Operation Procedure

<details>

<summary><strong>Button Functions (Click to Expand)</strong></summary>

The main unit has **four buttons**. The **bottom line (Line 3)** of the LCD displays the current function of each button. Under normal operation, the button functions are as follows:

* <img src="https://content.gitbook.com/content/i4ECt41Kyy9211OWazj4/blobs/BZuNjMgY75LH0onY5NtL/image" alt="" data-size="line"> **Blue Button -** Leftmost button: Return, exit, or save settings.

Gray Arrow Buttons:

* <img src="https://content.gitbook.com/content/i4ECt41Kyy9211OWazj4/blobs/Br88VpmnPLAPdutxVdZb/image" alt="" data-size="line"> **Left Gray Button:** Page up, increase value, or select item
* <img src="https://content.gitbook.com/content/i4ECt41Kyy9211OWazj4/blobs/3Dzp8nuxmHsaZ7LqBscw/image" alt="" data-size="line"> **Right Gray Button:** Page down, decrease value, or select item
* <img src="https://content.gitbook.com/content/i4ECt41Kyy9211OWazj4/blobs/sq6fX6r39JE0Au2hahAR/image" alt="" data-size="line"> **Orange Button:** Rightmost button: Enter settings, edit, or confirm selection

{% hint style="danger" %}
**Do not hold buttons for extended periods to avoid damage.**
{% endhint %}

{% hint style="info" %}
Button functions may change depending on the operation context to improve usability or prevent accidental presses.
{% endhint %}

</details>

```
C02 Del. Total Setting Steps
• From the main screen (green backlight), 
  press Orange Button (Setup) to enter settings (orange backlight).
• Use Gray Arrow Buttons to select C. Total , press Orange Button (Enter).
• Use Gray Arrow Buttons to select C02 Del. Total, press Orange Button (Enter).
• Use Gray Arrow Buttons to choose the options. 
• Press Orange Button (Set) to confirm.
• Press Blue Button (ESC) to return to the main screen (green backlight).
```

<figure><img src="https://3404778090-files.gitbook.io/~/files/v0/b/gitbook-x-prod.appspot.com/o/spaces%2Fi4ECt41Kyy9211OWazj4%2Fuploads%2FKWAElk0M3NgDhooK9f69%2FFU-LT-C02-en.png?alt=media&#x26;token=b46f70dc-6914-4247-90d4-61f833af4b1a" alt="" width="375"><figcaption></figcaption></figure>

### C02 Options – RS485 Values, Read/Write Commands, and Format

| Option             | RS485 Description | RS-485 Value |
| ------------------ | ----------------- | ------------ |
| No Reset (Default) | No                | 0            |
| Reset Totalizer    | Yes               | 1            |

> Refer to the Read/Write Memory List for the Modbus command format. \
> The data type for this parameter is **Int16**.

#### RS485 Remote Totalizer Reset (C02 Del. Total)

| Item             | Description                  |
| ---------------- | ---------------------------- |
| Parameter Name   | C02 Del. Total               |
| Description      | Resets the Totalizer to zero |
| Register Address | 02 01                        |
| Register Length  | 1                            |
| Data Type        | int16                        |
| Read Command     | Function Code 03             |
| Write Command    | Function Code 06             |

#### 1.Read Current Status (Function Code 03)

The master can use Function Code 03 to read the current status of C02:

* Return value = `0`: Not triggered (default)
* Return value = `1`: Reset action triggered

#### 2.Execute Totalizer Reset (Function Code 06)

The master can use Function Code 06 to write a specified value to the C02 register to trigger the reset:

* Write Value: `1` (Int16)
* After writing, the device immediately resets the Totalizer to zero.