# 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).
#### Modbus Converter between different formats
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### Notes
1. This parameter cannot be modified via RS485. For details, refer to the **RS485 and Modbus RTU Settings** section.
### Operation Procedure
Button Functions (Click to Expand)
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:
* **Blue Button -** Leftmost button: Return, exit, or save settings.
Gray Arrow Buttons:
* **Left Gray Button:** Page up, increase value, or select item
* **Right Gray Button:** Page down, decrease value, or select item
* **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 %}
```
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
