> For the complete documentation index, see [llms.txt](https://docs.yobiiq.com/user-manual-em4302t-lrw/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://docs.yobiiq.com/user-manual-em4302t-lrw/device/operation-guide.md).
# Operation Guide
## LCD Screen Information
| A | The power grid type icon represents the current measurement type of the meter. |
| - | ------------------------------------------------------------------------------------------------------ |
| B | Maximum demand icon |
| C | Direction icon for import and export energy |
| D | A status indicator icon for the meter |
| E | Icon for unit of measurement data |
| F | Battery status icon and lock icon. Displays the battery status and dictates that the device is locked. |
| G | Measured values |
| H | A status indicator for the digital I/O on the meter |
| I | Multi tariff icon indicating the tariff segment to which the current energy is measured. |
| J | Warning status icon |
| K | Channel indicator icon for multiple measurement channels |
| L | Quadrant indicator icon for indicating the quadrant of the current load |
### Button Information
| **Button** | **Definition** | **Click** | **Press 3 second** |
| ----------------------------------------------------------------------------- | -------------- | --------- | ------------------ |
| \
| Button 1:
Escape key (Esc)
| 1. In the setting screen or auxiliary screen: exit or return to the previous screen.
2. In the main display screen: page scroll for parameters such as voltage and current.
| Under the main display screen: enter the auxiliary display screen. |
\| \
| Button 2:
Up key
(Up)
| 1. In the main display screen: view the power factor, maximum demand.
2. In the setting screen or auxiliary screen: scroll up to display the page or the increasing number.
| Nothing |
\| 
| Button 3:
Down key
(Dn)
| 1. In the main display screen: view the power information.
2. In the setting screen or auxiliary screen: scroll down to display the page or the decreasing number.
| Nothing |
\| \
| Button 4:
Enter key
(Et)
| 1. In the main display screen: view energy data and system time.
2. In the setting screen: right move the setting cursor.
| 1. In the main display screen: enter the setting mode.
2. In the setting screen: enter the setting state or carry out confirmation operation.
|
## Startup Screens
After the EM4301 series products are properly wired and connected to the power supply, the products will first enter the self-test process.\
During the self-test process, the LCD display sequence is shown as follows.
| **First screen display** | Display full screen characters, serves as a display check. | 
|
| ------------------------- | ---------------------------------------------------------- | ----------------------------------------------------------------------- |
| **Second screen display** | Displays the software version number of the power meter | \
|
\| **Three screen display** | Display the results of the self-test | \
|
### Description of LCD Display
#### Main display screen
After the meter is powered on and passes the self-test process, the interface entered is defined as the main display interface. This is used to display the main measurement parameters, electric quantity data, instrument information and other data of the product. Users can scroll the display page by pressing the button 1 to button 4.
### Display screen under button 1
| **LCD display** | **Description** |
| ----------------------------------------------------------------------- | --------------- |
| \
| A display screen for three-phase L-N voltage.
Example:
L1-N voltage = 230.0V
L2-N voltage = 230.0V
L3-N voltage = 230.0V
Note: In 3P3W mode, this screen is not displayed
|
\| 
| A display screen for three-phase L-L voltage.
Example:
L1-2 voltage = 400.0V
L2-3 voltage = 400.0V
L3-1 voltage = 400.0V
Note: In 1P2W mode, this screen is not displayed
|
\| 
| A display screen for three-phase current.
Example:
L1 current = 5.001A
L2 current = 5.002A
L3 current = 5.000A
|
\| \
| A display screen for three-phase L-N voltage THD.
Example:
L1 voltage THD = 3.06%
L2 voltage THD = 2.78%
L3 voltage THD = 4.35%
|
\| 
| A display screen for three-phase L-L voltage THD.
Example:
L1-2 voltage THD = 2.74%
L2-3 voltage THD = 3.80%
L3-1 voltage THD = 0.00%
Note: This screen is displayed only in 3P3W mode.
|
\| \
| A display screen for three-phase current THD.
Example:
L1 current THD = 3.56%
L2 current THD = 2.45%
L3 current THD = 1.87%
|
### Display screen under button 2
| |
|---|
| LCD Display | Description |
 | Total power factor and frequency display screen Example: Total power factor = 1.000 Frequency = 50.00Hz |
 | Three - phase power factor display screen Example: L1 power factor = 1.000 L2 power factor = 1.000 L3 power factor = 1.000 |
 | Max. Demand of three-phase display screen Example: Max. Demand of L1 current = 5.000A Max. Demand of L2 current = 5.000A Max. Demand of L3 current = 5.000A |
 | Max. Demand of total active/reactive/apparent power display screen Example: Max. Demand of total active power = 3.680 kW Max. Demand of total reactive power = 5.701 kvar Max. Demand of total apparent power = 3.598 kVA |
### Display screen under button 3
| Display screen under button 3 | |
| ----------------------------------------------------------------------- | - |
| \
| Per phase active power display screen
Example:
L1 active power = 1.150 kW
L2 active power = 1.150 kW
L3 active power = 1.150 kW
|
\| 
| Per phase reactive power display screen
Example:
L1 reactive power = 0 kvar
L2 reactive power = 0 kvar
L3 reactive power = 0 kvar
|
\| 
| Per phase apparent power display screen
Example:
L1 apparent power = 1.150 kVA
L2 apparent power = 1.150 kVA
L3 apparent power = 1.150 kVA
|
\| 
| Total active/reactive/apparent power display screen
Example:
Total active power = 3.450 kW
Total reactive power = 0 kvar
Total apparent power = 3.450 kVA
|
### Display screen under button 4
| 
| Total active energy
Example:
Total active energy = 30.10 kWh
|
| ---------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------- | --------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------- |
| 
| Import active energy
Example:
Import active energy = 15.05 kWh
|
| 
| Export active energy
Example:
Export active energy = 15.05 kWh
|
| 
| Tariff 1 active energy
Example: Tariff 1 active energy = 63.42kWh
Note: Only multi-tariff meter and 2T meter show this page
|
| 
| Tariff 2 active energy
Example: Tariff 2 active energy = 28.63kWh
Note: Only multi-tariff meter and 2T meter show this page
|
| 
| Tariff 3 active energy
Example: Tariff 3 active energy = 83.55kWh
Note: Only multi-tariff meter show this page
|
| 
| Tariff 4 active energy
Example: Tariff 4 active energy = 93.26kWh
Note: Only multi-tariff meter show this page
|
| 
| Total reactive energy
Example: Total reactive energy = 2363.49kvarh
|
| 
| Import reactive energy
Example: Import reactive energy = 2300.26kvarh
|
| 
| Export reactive energy
Example: Export reactive energy = 63.23kvarh
|
| 
| Displaying the current date of the system real-time clock.
Example: The current date is June 4, 2021
Note: Only multi-tariff meter show this page
|
|  | Displaying the current time of the system real-time clock.
Example: The current time is 14:32.38
Note: Only multi-tariff meter show this page
|
| Icon description of the load nature:
means : The load is an inductive load , 
means : The load is a capacitive load.
| |
## Auxiliary display screen
Under the main display screen, press button 1 for 3 seconds to enter the screen of auxiliary display. At this point, click button 2 or button 3 to scroll the page that needs to be viewed. Under the screen of auxiliary display, click button 1 to return to the main display screen.\
If there is no button operation in more than 1 minute under the screen of auxiliary display, the meter will automatically return to the main display screen.
\| \
| Modbus address
Example: The Modbus address is 1.
|
| ----------------------------------------------------------------- | ------------------------------------------------------------- |
| \
| Baud rate
Example: The baud rate is 9600bps.
|
\| \
| Parity bit
Example: The Parity bit is None.
|
\| \
| Ratio of current transformer (CT) |
\| \
| Ratio of voltage transformer (PT) |
\| \
| The serial number of meter
Example: The serial number is 21000110.
|
\| \
| Software version number |
\|  | The join the network status of the OTAA.
By pressing the button 4 for 3 seconds can the meter can be triggered immediately to join LoRaWAN gateway.
Note: The second and third line of characters on the screen represents the networking status.
means: joined LoRaWAN gateway.
\
means: The meter is being join to the LoRaWAN gateway.
\
means: The meter has not been joined to the gateway and is waiting to be join. The bottom characters represents the wait time.
|
\|  | Unique ID of the device (DEUI).
By pressing the button 4 for 3 seconds can view DEUI information.
|
\|  | The DEVUI is 64bit hex-coded, so it is divided into two screen (P1-P2). Here the screen display represents the DEUI is 00 80 E1 15 00 2C BD 92. |
\|  | Application Identifier (APP EUI).
By pressing the button 4 for 3 seconds can view APP EUI information.
|
\|  | The APP EUI is 64bit hex-coded, so it is divided into two screen (P1-P2). Here the screen display represents the APP EUI is 01 01 01 01 01 01 01 01. |
\| | |
\|  | Application key for OTAA mode (APP KEY).
By pressing the button 4 for 3 seconds can view APP KEY information.
|
\| 
 | The APP KEY is 128bit hex-coded, so it is divided into four screen (P1-P4). Here the screen display represents the APP KEY is 1F D9 8E E4 D4 EA CE 4C 17 C1 0C 52 A1 B7 9B 19. |
\|  | ADR
Allow network server to adjust the datarate of the device.
|
\|  | The re-join interval time.
If no downlink data from the gateway is received within the re-join interval time, the meter will determine that LoRaWAN has been disconnected, and the meter will perform the join operation again.
|
\|  | RX2 data rate to receive downlinks.
Example: DR0
|
\|  | RX2 frequency to receive downlinks. Unit: MHz
Example: 869.5MHz
|
\|  | LoRaWAN Test.
By pressing the button 4 for 3 seconds the device can send a device status uplink to the joined LoRaWAN network.
Note: The third line of characters on the screen represents the sending status.
\
means: No send operation is performed.
means: Sending operation is being performed.
means: Send successfully.
means: Send failure.
|
---
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