> 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/fp-as510-paddle-wheel-flowmeter-manual-en-v2/human-machine-interface/introduction-of-human-machine-interface.md).
# HMI Overview
### Main Unit Functions
The FP-AS510 features Double-screen display:
* A **5-digit LED display** for high-contrast real-time data readout
* A **3-row, 3-color backlit LCD screen** for detailed data, page names, units, and button labels
* Line 1: Current page name and units
* Line 2: Actual measured data
* Line 3: Available key functions for the current screen
### **Button Functions**
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:** Previous Page, decrease value, or select item
* 
**Right Gray Button:** Next Page, increase 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 %}
### **LCD Three-Color Backlight Function**
The system provides a three-color backlight display. The **red backlight** is only activated when the alarm setting is **“On”**; if set to **“DND (Do Not Disturb)”** or **“Off”**, the backlight will remain off. The meanings of each color are as follows:
{% stepper %}
{% step %}
### **Green Backlight**
* System operating normally
* Displaying real-time information
* All data within normal range
{% endstep %}
{% step %}
### **Flashing Red Backlight**
* Major abnormality (**Alarm A**) detected
* Refer to the Alarms and System Status page for more information
{% endstep %}
{% step %}
### **Red Backlight**
* **Alarm B:** User-defined alert condition triggered
* **Alarm C:** Maintenance reminder condition reached
* Refer to the Alarms and System Status page for more information
{% endstep %}
{% step %}
### **Orange Backlight**
* System operating normally
* Display currently on **Settings page**, not real-time information
{% endstep %}
{% endstepper %}
{% hint style="info" %}
#### **DND (Do Not Disturb) Mode**
* System detects abnormalities, but **red backlight remains off**.
* Example: **Alarm-A “4 Off Pipe”** triggers no backlight.
* Abnormalities still appear on the **Abnormalities page**.
* **RS485** connection still sends alarm signals.
* **OCT output** continues to signal alarms if configured.
{% endhint %}
## **Frequency of data update**
Due to frequent data updates for real time flow volume, data on the LED screen will update first, then data on the LCD screen. Therefore, they may have about 0.1 seconds updated time difference. between both data sets.If there are not many digits in the data, please use the LED screen for the main data.
## **Displayed digits on LED screen**
Maximum 5 displayed digits are provided on the LED screen. If data digits exceed more than 5 digits, “FFFFF” will be displayed on the LED screen (please refer below image). At this time, for reading complete data, you can try to modify the units or see the 2nd row data on the LCD screen to confirm exact flow volume.
When the flow direction is reversed and the data is negative number, the 1st digit will be a minus sign with four remaining digits.
---
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