# FP-AS510 C02 Del. Total

### Definition

This function manually resets the flow meter’s **Totalizer** to zero. 

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

**For Firmware version 2.2.9 and before:**

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

**For version P2301 and after:**

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

#### 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        | unsigned Int16               |
| Write Command    | Function Code 06             |

### Example: 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. 

### Master Sends Write Command（TX Frame）

```
TX: 01 06 02 01 00 01 18 72
```

* Slave Address：`01` 
* Function Code：`06`
* Starting Register Address：`02 01`（C02）
* Written Value：`00 01`（Clear command for Firmware version P2301 ）
* CRC：`18 72`（Modbus RTU CRC，Low byte first）

### Slave Response Data（RX Frame）

```
RX: 01 06 02 01 00 01 18 72
```

**If the RX frame exactly matches the TX frame (including the CRC), it indicates that:**

* The command has been successfully executed.
* The value **00 01** has been correctly written to **Register 02 01**.
* The slave has completed and acknowledged the **C02 clear operation**.


---

# Agent Instructions: Querying This Documentation

If you need additional information that is not directly available in this page, you can query the documentation dynamically by asking a question.

Perform an HTTP GET request on the current page URL with the `ask` query parameter:

```
GET https://docs.lorric.com/qr/fu-lt-english-v1/fp-as510-c02-del.-total.md?ask=<question>
```

The question should be specific, self-contained, and written in natural language.
The response will contain a direct answer to the question and relevant excerpts and sources from the documentation.

Use this mechanism when the answer is not explicitly present in the current page, you need clarification or additional context, or you want to retrieve related documentation sections.