# Edge Data Tag Options

## **Edge Data Tag Options in TilliT**

When configuring **Edge Data Tags** in TilliT, you can supply options as a **JSON string** to modify how data is processed. All options must be formatted as follows:

```json
{"option1": "value1", "option2": "value2"}
```

## **Available Options**

### **Scale**

The `scale` option allows you to adjust the raw value by multiplying or dividing it by a specified factor.

**Examples:**

* Multiply the raw value by 1000:

  ```json
  {"scale": 1000}
  ```
* Divide the raw value by 1000:

  ```json
  {"scale": 0.001}
  ```

### **Rollover**

Use the `rollover` option when the tag you are reading has a **rollover value**. This is particularly useful for the `COUNT_TOTAL` template, ensuring that TilliT correctly calculates the difference when a counter resets to zero.

**Example Scenario:**

* A counter rolls over at **1000**.
* The initial value is **950**, and the next read is **5**.
* Without rollover handling, the difference would appear as **-945**.
* With rollover (`{"rollover": 1000}`), TilliT correctly calculates the difference as **55**.

**Example Configuration:**

```json
{"rollover": 1000}
```

By using these options, you can ensure accurate data interpretation and seamless integration with TilliT’s processing logic.


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