> For the complete documentation index, see [llms.txt](https://docs.lorric.com/qr/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://docs.lorric.com/qr/fu-es-echosense-instruction-manual/parameters/c-total/c02-del.total.md).

# 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</strong> <em>(Click to Expand)</em></summary>

When the main screen is displayed in **green backlight**, the four buttons function as follows:

* <img src="/files/bdd75120acea6361d128fd3deec06f1a8277e667" alt="" data-size="line"> **Blue Button (leftmost):** Return, exit, or save settings.
* Gray Direction Buttons:
  * <img src="/files/2e37e572251371c6020ab6d9e11c1fcdd5ef0369" alt="" data-size="line"> **Left Gray:** Previous Page, decrease value, or select item
  * <img src="/files/50a67ff5744401e217d5b9e838da3f7909be732f" alt="" data-size="line"> **Right Gray:** Next Page, increase value, or select item
* <img src="/files/uJJ6BEZ4sukIlwQaHrUB" alt="" data-size="line"> **Orange Button (rightmost):** 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="/files/2oKLUtmaqUYh4kyno9r0" alt="" width="563"><figcaption></figcaption></figure>

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

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

> Refer to the [Read/Write Memory List](/qr/fu-es-echosense-instruction-manual/communication/modbus-rtu-protocol/read-write-memory-ram/read-write-memory-read-list.md) 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.


---

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