# E16 Bit Order

### Definition

Sets the bit order for each byte during Modbus RTU transmission. Options: Least Significant Bit (LSB) first or Most Significant Bit (MSB) first. Default: LSB first.

This parameter is used to set the transmission order of data bits within a single byte.\
LSB means bit 0 is transmitted first, while MSB means bit 7 is transmitted first.\
LSB is the most commonly used format.\
The packet diagram below uses **N.8.1** as an example (each diamond represents one bit).

<div align="left"><figure><img src="https://docs.lorric.com/qr/~gitbook/image?url=https%3A%2F%2F598628291-files.gitbook.io%2F%7E%2Ffiles%2Fv0%2Fb%2Fgitbook-x-prod.appspot.com%2Fo%2Fspaces%252FYbqXsfQyaXKmr6mxssGy%252Fuploads%252FXoEcxDBu6IAPiUPt1ZTE%252FLSBMSB.png%3Falt%3Dmedia%26token%3D95c52e94-fbd3-4bc4-9791-7540c711dfde&#x26;width=768&#x26;dpr=4&#x26;quality=100&#x26;sign=b80ce0d9&#x26;sv=2" alt=""><figcaption></figcaption></figure></div>

#### Modbus Converter between different formats

{% embed url="<https://codepen.io/philo_lorric/pen/BagqoRj>" %}

### Notes

1. This parameter cannot be modified via RS485. For details, refer to the **RS485 and Modbus RTU Settings** section.

### Operation Procedure

<details>

<summary><strong>Button Functions</strong> <em>(Click to Expand)</em></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="/files/bdd75120acea6361d128fd3deec06f1a8277e667" alt="" data-size="line"> **Blue Button:** Leftmost button: 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 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>

```
E16 Bit OrderSetting Steps
• From the main screen (green backlight), 
  press Orange Button (Setup) to enter settings (orange backlight).
• Use Gray Arrow Buttons to select E. Commute, press Orange Button (Enter).
• Use Gray Arrow Buttons to select E16 Bit Order, 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).
```

### E16 Options, RS485 Values, Read/Write Commands, and Formats

<table><thead><tr><th>Option</th><th>Description</th><th>RS-485 Value</th><th data-hidden>RS-485 對應數字</th></tr></thead><tbody><tr><td>LSB first (Default)</td><td>Least Significant Bit (LSB) first</td><td>-</td><td>0</td></tr><tr><td>MSB first</td><td>Most Significant Bit (MSB) first</td><td>-</td><td>1</td></tr></tbody></table>


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