Radar Level Gauge With More Compact RF Architecture Measurement Frequency 80GHz Supply Voltage 9~24V

 

1.Introduction

 

1.1 Product Overview

 

KWL801B-RS485 radar level sensor conforms to the standard specifications outlined in national standard DB50/T 826-2017 for level meters. Its core component is designed with a fully sealed IP68 waterproofing.

The maximum measurement range of the product extends up to 40 meters, with a minimal blind spot of less than 6 cms.

Due to its higher frequency and broader bandwidth, it achieves superior accuracy. Additionally, the product includes a fixed bracket for installation.

 

1.2 Detection principle

 

Radar level sensor is based on the principle of time domain reflection (TDR). The electromagnetic pulse propagates along the cable or probe with the speed of light. When it meets the surface of the measured medium, part of the pulse of the radar level meter is reflected to form an echo return to the pulse transmitter along the same path, and the distance between the transmitter and the surface of the measured medium is In direct proportion as the propagation time of the pulse, hence the height of the level is calculated.

 

 

 

2.Feature

• Based on the self-developed CMOS millimeter-wave RF chip
• More compact RF architecture
• Higher signal-to-noise ratio
• Smaller dead zone
• 5GHz working bandwidth
• Higher measurement resolution and measurement accuracy
• Less influence by the interference in the installation environment
• More convenient of installation and
• Modern design of integrated flat antenna

 

3.Technical Specifications

Model	KWL801B-RS485
Frequency of measurement	80GHz
Communication	RS485
Frequency of acquisition	≥200ms/ configurable
Current of operation	12V/14mA
Distance measurement accuracy	±2mm
Communication protocol	Modbus/ Text protocol
Antenna beam width	±2.75°
Supply voltage	9~24V
Range of measurement	0.2~40m 0.18~30m 0.1~15/20m 0.06~3/5/10m
RF pulse current	100mA/20ms
Working humidity	0~95%
Type of thread	G thread/ customized
Working temperature	-40~75℃
Grade of water resistance	IP68
Net weight	0.6kgs

 

 

4.Wiring Instructions

 

Red line	VCC (9~24V power supply)
Black line	GND
Yellow line	485-A
Green line	485-B

 

 

5.Dimension

 

 

6.Installation instructions

 

6.1 Inspection before installation

 

(1) Take the sensor out of the packaging box, carefully check the packing list according to the instruction manual, and check whether the equipment accessories are complete .

(2) Carefully read the product instruction manual and product certificate .

(3) Check whether there is any damage to the appearance of the instrument, especially whether the main unit is intact, and be careful to place the main unit properly to prevent it from being knocked over.

 

6.2 Radar level sensor installation

 

6.2.1 Check before installation

 

Please check before installing the sensor as follows:

Whether there are trees or other debris above the medium at the installation site.

Whether the mounting bracket is installed horizontally.

When the mounting bracket cannot be installed horizontally, you need to adjust the bracket according to gradienter on the surface of the sensor to make sure the sensor is in a horizontal position.

 

6.2.2 Installation

 

(1) Ensure that the sensor is perpendicular to the medium surface.

(2) Avoid the transmitting beam from irradiating interference objects and generating false echoes.

See the following for typical working conditions:

 

 

      Installation of upper thread                                          Installation of lower thread

 

 

 

 

Ensure that the radar level meter is installed perpendicular to the medium surface.

Inclination will weaken the received signal amplitude and affect normal ranging.

 

Attention:

Try to keep the sensor fixed to avoid jitter when installing, and keep the surrounding environment as open as possible.

1. The distance between the sensor and the medium surface is higher than 30cm to ensure that the front face of the sensor (antenna) is perpendicular to the measuring medium.

2. The distance between the sensor and the edge of the tank, the edge of the pool, the edge of the river dam and the edge of the pool is greater than 0.5 meters;

3. Select the position of the water surface with small fluctuations to install the module (try not to install in the water injection port, outlet and other water surface with large fluctuations, the greater the water surface fluctuation, the worse the measurement accuracy)

 

 

​7.MODBUS-RTU communication protocol

 

7.1 MODBUS protocol

 

1. Communication protocol hardware interface parameters

The sensor uses serial port communication, and the default parameters are as follows :

Communication Parameters	Serial Port Level	Baud Rate	Parity Check	Data Length	Stop Bit
Serial Port	TTL	9600	None	8	1

Timeout between frames 50ms.

 

2. Communication protocol format

 

The water level gauge communicates externally using the Modbus RTU communication protocol. Each complete data frame includes: address field, Function Code, data, and checksum. The checksum is the CRC16 check data of the data frame, with the low byte preceding the high byte. The default factory address for the sensor is 0x7F.

Request command format and radar reply data format are described as follows:

(1) Query parameter format: Function Code 0x03

 

Request:

Device Address	Function Code	Register Address	Number of Registers	C R C
1 Byte	1 Byte	2 Bytes	2 Bytes	2 Bytes

 

Reply:

Device Address	Function Code	Data Length	Register Value	C R C
1 Byte	1 Byte	1 Byte	2N Bytes	2 Bytes

N: numbers of registers

 

(2) Query parameter format: Function Code 0x04

 

Request:

Device Address	Function Code	Register Address	Number of Registers	C R C
1 Byte	1 Byte	2 Bytes	2 Bytes	2 Bytes

 

Reply:

Device Address	Function Code	Data Length	Register Value	C R C
1 Byte	1 Byte	1 Byte	2N Bytes	2 Bytes

N: numbers of registers

 

(3) Set parameter format: Function Code 0x10

 

Request:

Device Address	Function Code	Register Address	Number of Registers	Data Length	Register Value	C R C
1 Byte	1 Byte	2 Bytes	2 Bytes	1 Byte	2N Bytes	2 Bytes

Reply:

Device Address	Function Code	Register Address	Number of Registers	C R C
1 Byte	1 Byte	2 Bytes	2N Bytes	2 Bytes

N: numbers of registers

 

3. Register Address Summary Table

 

Parameter Default
Parameter	Register Address	PLC Or Group Status Address	Support Function Code	Type Of Data	Illustrate
Slave Address​	0x2001	48194	0x03,0x10	int16	int16 For 2 Bytes Integer ; int32 For 4 Byte Integer , High 16 In Front
Baud Rate	0x2002	48195	0x03,0x10	int32
Version Information	0x2004	48197	0x03	int32
Set Up Calibration	0x2052	48275	0x03,0x10	int16
Automatic Push Cycle	0x2053	48276	0x03,0x10	int16
Blind Spot	0x2044	48261	0x03	Float(little 16)	Float(little 16) is 4 byte float , low 16th place first
Measuring Range	0x2046	48263	0x03	Float(little 16)
Set Current Depth	0X2048	48265	0x03,0x10	Float(little 16)
Set Up Installation High	0x204A	48267	0x03,0x10	Float(little 16)
Level	0x0A0B	32572	0x04	Float(little 16)
Empty Height	0xaof	32576	0x04	Float(little 16)

 

Note: The Register Address and data type of some parameters can be modified by the host computer software. After modifying the Register Address or data type, the corresponding Modbus operation instructions will also change accordingly, such as: The default instruction to read the empty height is 0x 7F 04 0A 0F 00 02 48 0E. If the register of the empty height is modified to 00 01, the instruction to read the empty height is changed to 0x 7F 04 00 01 00 02 2A 15.

 

4. Communication protocol command description

Note:

a. The default Device Address is 0x7F;

b. The float type data in the data adopts IEEE754 binary floating point arithmetic standard, the low 16 bits in the first (CDAB);

c. In the following example, the Register Address corresponding to each parameter is the default address. If the address of the register is modified by the host computer, the Register Address in the Modbus operation instruction should be changed accordingly;

d. In the following example, the data definition (data type/unit) of each parameter is parsed according to the default configuration. If the data definition (data type/unit) is modified through the host computer, the data reading and parsing should be modified accordingly;

 

 

7.2 Query data instruction: Function Code 0x04

7.2.1 Query measurement results - level (i.e. installation height - air height)

Request command:

Device Address	Function Code	Register Address	Number of Registers	CRC
0x7F	0x04	0x0A 0B	0x00 02	0x09 CF

 

Reply data:

Device Address	Function Code	Length of Data	Data	CRC
0x7F	0x04	0x04	0x00 00 41 30	0x09 CF

Data definition: The default data type is float(little16) data, the default unit is meters (m), the data length is 4 bytes, and the lowest 16 bits are in the first.

Error code:

① When the installation height is not set, the level cannot be calculated, and the output 0xFC FC FC FC ;

② When the measurement results exceed the range, output 0xFF FF FF FF;

③ When the sensor is in the blind area, output 0xFE FE FE FE;

④ When the sensor echo energy is insufficient, the output 0xFD FD FD FD;

Example 1:

Request: 7F 04 0A 0B 00 02 09 CF

Reply: 7F 04 04 00 00 41 30 55 C7

The data part 0x 00 00 41 30 is converted to floating point data, that is, 11.00 m.

Example 2:

Request: 7F 04 0A 0B 00 02 09 CF

Re: 7F 04 04 FC FC FC FC D4 A2

In the data part, 0x FC FC FC FC is an error code, indicating that the mounting height is not set (the level cannot be calculated).

 

7.2.2 Query measurement results - air height

Request command:

Device Address	Function Code	Register Address	Number of Registers	CRC
0x7F	0x04	0x0A 0F	0x00 02	0x48 0E

 

Reply data:

Device Address	Function Code	Length of Data	Data	CRC
0x7F	0x04	0x04	0x31 13 40 10	0xAA B6

Data definition: The default data type is float(little16) data, the default unit is meters (m), the data length is 4 bytes, and the lowest 16 bits are in the first.

Error code:

① When the measurement results exceed the range, output 0xFF FF FF FF;

② When the sensor is in the blind area, output 0xFE FE FE FE;

③ When the sensor echo energy is insufficient, the output 0xFD FD FD FD FD;

Example 1:

Request: 7F 04 0A 0F 00 02 48 0E

Reply: 7F 04 04 31 13 40 10 AA B6

The data part 0x 31 13 40 10 is converted to floating point data, that is, 2.253 m.

Example 2:

Request: 7F 04 0A 0F 00 02 48 0E

Reply: 7F 04 04 FE FE FE F4 7B

The data part 0x FE FE FE FE is the error code, indicating that the sensor is in the blind area and no valid data can be read.

 

7.3 Query configuration information instruction: Function Code 0x03

7.3.1 Broadcast query slave address

Request command:

Device Address	Function Code	Register Address	Number of Registers	CRC
0xFF(broadcast)	0x03	0x20 01	0x00 01	0xCB D4

 

Reply data:

Device Address	Function Code	Length of Data	Data	CRC
0x7F	0x03	0x02	0x00 7F	0xD1 AE

Data definition: The data type is int16 data, and the data length is 2 Bytes.

Examples:

Request: FF 03 20 01 00 01 CB D4

Reply: 7F 03 02 00 7F D1 AE

The data part 0x 00 7F is converted to integer data, which is 127 or 0x7F.

 

7.3.2 Query the baud rate of the communication interface

Note: Baud rate only supports: 4800,9600,19200,38400,115200

Request command:

Device Address	Function Code	Register Address	Number of Rregisters	CRC
0x7F	0x03	0x20 02	0x00 02	0x64 15

 

Reply data:

Device Address	Function Code	Length of Data	Data	CRC
0x7F	0x03	0x04	0x00 00 25 80	0x7F 04

Data definition: The data type is int32(big) data, and the data length is 4 bytes.

Examples:

Request: 7F 03 20 02 00 02 64 15

Reply: 7F 03 04 00 00 25 80 7F 04

The data part 0x 00 00 25 80 is converted to integer data, which is 9600.

7.3.3 Query version information

Request command:

Device Address	Function Code	Register Address	Number of Registers	CRC
0x7F	0x03	0x20 04	0x00 02	0x84 14

 

Reply data:

Device Address	Function Code	Length of Data	Data	CRC
0x7F	0x03	0x04	0x20 23 09 08	0x99 A8

Data definition: The data type is int32 data, and the data length is 4 bytes. Version numbers were coded in BCD format.

Examples:

Request: 7F 03 20 04 00 02 84 14

Reply: 7F 03 04 20 23 09 08 99 A8

The data part is 0x 20230908, and the data is encoded in BCD format, namely the version number is 20230908.

 

7.3.4 Query calibration parameters

Request command:

Device Address	Function Code	Register Address	Number of Registers	CRC
0x7F	0x03	0x20 52	0x00 01	0x24 05

 

Reply data:

Device Address	Function Code	Length of Data	Data	CRC
0x7F	0x03	0x02	0x00 10	0x91 82

Data definition: The data type is int16 data, the unit is millimeter (mm), and the data length is 2 Bytess.

Examples:

Request: 7F 03 20 52 00 01 24 05

Reply: 7F 03 02 00 10 91 82

The data part 0x 00 10 is converted to integer data, that is, 16 mm.

 

7.3.5 Query automatic push cycle

Note: When the automatic push period is >=300ms, the sensor will automatically push data. When the installation height is not set ( level cannot be calculated), push the air height data; When the mounting height is set, push the level data.

Request command:

Device Address	Function Code	Register Address	Number of Registers	CRC
0x7F	0x03	0x20 53	0x00 01	0x75 C5

 

Reply data:

Device Address	Function Code	Length of Data	Data	CRC
0x7F	0x03	0x02	0x03 E8	0x90 F0

Data definition: The data type is int16 data, the unit is milliseconds (ms), and the data length is 2 Bytes.

Examples:

Request: 7F 03 20 53 00 01 75 C5

Reply: 7F 03 02 03 E8 90 F0

Where the data part 0x 03 E8 is converted to integer data, that is, 1000 ms.

 

7.3.6 Query blind area

Request command:

Device Address	Function Code	Register Address	Number of Registers	CRC
0x7F	0x03	0x20 44	0x00 02	0x85 C0

 

Reply data:

Device Address	Function Code	Length of Data	Data	CRC
0x7F	0x03	0x04	0x6D B7 3E AB	0x99 61

Data definition: The default data type is float(little16) data, the default unit is meters (m), and the data length is 4 bytes.

Examples:

Request: 7F 03 20 44 00 02 85 C0

Reply: 7F 03 04 6D B7 3E AB

The data part 0x 6D B7 3E AB was converted to floating-point type data, that is, 0.334 m.

 

7.3.7 Query range

Request command:

Device Address	Function Code	Register Address	Number of Registers	CRC
0x7F	0x03	0x20 46	0x00 02	0x24 00

 

Reply data:

Device Address	Function Code	Length of Data	Data	CRC
0x7F	0x03	0x04	0x00 00 42 20	0x55 4C

Data definition: The default data type is float(little16) data, the default unit is meters (m), and the data length is 4 bytes.

Examples:

Request: 7F 03 20 46 00 02 24 00

Reply: 7F 03 04 00 00 42 20 55 4C

The data part 0x 00 00 42 20 is converted to floating point data, that is, 40.0m.

 

7.3.8 Check the depth at installation

Note: The water depth at the time of installation is used to calculate the installation height. Installation height = water depth at installation + real time height at installation. When setting the water depth at the time of installation, the installation height is automatically calculated and saved to the configuration.

Request command:

Device Address	Function Code	Register Address	Number of Registers	CRC
0x7F	0x03	0x20 48	0x00 02	0x45 C3

 

Reply data:

Device Address	Function Code	Length of Data	Data	CRC
0x7F	0x03	0x04	0x47 AE 40 B1	0xE0 D5

Data definition: The default data type is float(little16) data, the default unit is meters (m), and the data length is 4 bytes.

Examples:

Request: 7F 03 20 48 00 02 45 C3

Reply: 7F 03 04 47 AE 40 B1 E0 D5

The data part 0x 47 AE 40 B1 was converted to floating point data, that is, 5.54 m.

 

7.3.9 Check installation height

Note: Set the mounting height, which is used to calculate the level. Real-time level = installation height - real time height. At the same time, installation height = water depth at installation + height at installation time. Therefore, when setting the installation height, the water depth during installation will be automatically calculated and saved to the configuration.

Request command:

Device Address	Function Code	Register Address	Number of Registers	CRC
0x7F	0x03	0x20 4A	0x00 02	0xE4 03

 

Reply data:

Device Address	Function Code	Length of Data	Data	CRC
0x7F	0x03	0x04	0x8A 64 41 2A	0xBE 7C

Data definition: The default data type is float(little16) data, the default unit is meters (m), and the data length is 4 bytes.

Examples:

Request: 7F 03 20 4A 00 02 E4 03

Reply: 7F 03 04 8A 64 41 2A BE 7C

The data part 0x 8A 64 41 2A is converted to floating point data, that is, 10.65m.

7.4 Set instruction: Function Code 0x10

7.4.1 Set the slave address

Request command:

Device Address	Function Code	Register Address	Number of Registers	Length of Data	Data	CRC
0x7F	0x10	0x20 01	0x00 01	0x02	0x00 01	0x6E 21

 

Reply data:

Device Address	Function Code	Register Address	Number of Registers	CRC
0x7F	0x10	0x20 01	0x00 01	0x51 D7

Data definition: The data type is int16 data, and the data length is 2 Bytess.

Examples:

Request: 7F 10 20 01 00 01 02 00 01 6E 21

The data part 0x 00 01 is converted to integer data, that is, 1 or 0x01.

Reply: 7F 10 20 01 00 01 51 D7

 

7.4.2 Set baud rate of communication interface

Note: Baud rate only supports: 4800,9600,19200,38400,115200

Request command:

Device Address	Function Code	Register Address	Number of Registers	Length of Data	Data	CRC
0x7F	0x10	0x20 02	0x00 02	0x04	0x00 01 C2 00	0x75 3E

 

Reply data:

Device Address	Function Code	Register Address	Number of Registers	CRC
0x7F	0x10	0x20 02	0x00 02	0xE1 D6

Data definition: The data type is int32 data, and the data length is 4 bytes.

Examples:

Request: 7F 10 20 02 00 02 04 00 01 C2 00 75 3E

The data part 0x 00 01 C2 00 is converted to integer data, which is 115200.

Reply: 7F 10 20 02 00 02 E1 D6

 

7.4.3 Setting calibration parameters

Request command:

Device Address	Function Code	Register Address	Number of Registers	Length of Data	Data	CRC
0x7F	0x10	0x20 52	0x00 01	0x02	0x00 01	0xA2 4E

 

Reply data:

Device Address	Function Code	Register Address	Number of Registers	CRC
0x7F	0x10	0x20 52	0x00 01	0xA1 C6

Data definition: The data type is int16 data, the unit is millimeter (mm), and the data length is 2 Bytes.

Examples:

Request: 7F 10 20 52 00 01 02 00 10 A2 4E

The data part 0x 00 10 is converted to integer data, that is, 16 mm.

Reply: 7F 10 20 52 00 01 A1 C6

 

7.4.4 Set automatic push cycle

Note: When the automatic push period is >=300ms, the sensor will automatically push data. When the installation height is not set ( level cannot be calculated), push the air height data; When the mounting height is set, push the level data.

Request command:

Device Address	Function Code	Register Address	Number of Registers	Length of Data	Data	CRC
0x7F	0x10	0x20 53	0x00 01	0x02	0x03 E8	0xA2 ED

 

Reply data:

Device Address	Function Code	Register Address	Number of Registers	CRC
0x7F	0x10	0x20 53	0x00 01	0xF0 06

Data definition: The data type is int16 data, the unit is milliseconds (ms), and the data length is 2 Bytes.

Examples:

Request: 7F 10 20 53 00 01 02 03 E8 A2 ED

Where the data part 0x 03 E8 is converted to integer data, that is, 1000 ms.

Reply: 7F 10 20 53 00 01 F0 06

 

7.4.5 Set the water depth at the time of installation

Note: The water depth at the time of installation is used to calculate the installation height. Installation height = water depth at installation + real time height at installation. When setting the water depth at the time of installation, the installation height is automatically calculated and saved to the configuration.

Request command:

Device Address	Function Code	Register Address	Number of Registers	Length of Data	Data	CRC
0x7F	0x10	0x20 48	0x00 02	0x04	0x47 AE 40 B1	0x75 30

 

Reply data:

Device Address	Function Code	Register Address	Number of Registers	CRC
0x7F	0x10	0x20 48	0x00 02	0xC0 00

Data definition: The default data type is float(little16) data, the default unit is meters (m), and the data length is 4 bytes.

Examples:

Request: 7F 10 20 48 00 02 04 47 AE 40 B1 75 30

The data part 0x 47 AE 40 B1 was converted to floating point data, that is, 5.54 m.

Reply: 7F 10 20 48 00 02 C0 00

7.4.6 Set the installation height

Note: The installation height is the distance from the sensor to the 0 object level. If the current water depth is 2 meters and the air height is 4 meters, the installation height is 6 meters. Set the mounting height, which is used to calculate the level. Real-time level = installation height - real time height. At the same time, installation height = water depth at installation + height at installation time. Therefore, when setting the installation height, the water depth during installation will be automatically calculated and saved to the configuration.

Request command:

Device Address	Function Code	Register Address	Number of Registers	Length of Data	Data	CRC
0x7F	0x10	0x20 4A	0x00 02	0x04	0x8A 64 41 2A	0xAA 40

 

Reply data:

Device Address	Function Code	Register Address	Number of Registers	CRC
0x7F	0x10	0x20 4A	0x00 02	0x61 C0

Data definition: The default data type is float(little16) data, the default unit is meters (m), and the data length is 4 bytes.

Note: Setting the mounting height to 0 will clear the mounting height/water depth configuration at installation.

Examples:

Request: 7F 10 20 4A 00 02 04 8A 64 41 2A AA 40

The data part 0x 8A 64 41 2A is converted to floating point data, that is, 10.65m.

Reply: 7F 10 20 4A 00 02 61 C0

 

7.5 Text protocol

7.5.1 Communication protocol hardware interface parameters

The water level meter adopts serial communication, and the default parameters are as follows:

Communication parameters	Serial port level	Baud rate	Parity check	Length of Data	Stop position
Serial port	TTL	9600	-	8	1

The timeout time was 50ms for each frame interval.

 

7.5.2 Description of communication protocol commands

Note: "n" represents a newline, corresponding to the hexadecimal number 0x0A. After the setup command configuration is successful, the configuration will be saved in Flash, and no reconfiguration is needed to restart the power outage.

The command error response is as follows:

Command error response	Description
This AT cmd is errorn	Instruction error
This AT cmd is no existn	Instruction does not exist
This AT cmd is exist,but not allow to operaten	Instructions exist but are not allowed to operate
This AT cmd is exist,but value is errorn	Incoming parameter error

1.Read the real spatio-temporal height

Unit: Meter (m)

	Instruction	Description
Send	AT+REALAIRHEIGHTn	Read the real spacetime height
Reply	REALAIRHEIGHT=2.212mn	The current real spacetime height is 2.212 meters
Reply	REALAIRHEIGHT=OutRangen	Out of range
Reply	REALAIRHEIGHT=InBlindZonen	The sensor is in the blind area
Reply	REALAIRHEIGHT=LackEnergyn	The echo energy is insufficient

 

2.Read the real-time level

Unit: Meter (m)

The calculation method of the level is: installation height - air height

	Instruction	Description
Send	AT+REALWATERDEPTHn	Read real-time level
Reply	REALWATERDEPTH=7.789m	The current real-time level is 7.789 meters
Reply	REALWATERDEPTH=OutRangen	Out of range
Reply	REALWATERDEPTH=InBlindZonen	The sensor is in the blind area
Reply	REALWATERDEPTH=LackEnergyn	The echo energy is insufficient
Reply	REALWATERDEPTH=No Set InstallHeightn	The installation height is not set

 

3.Water depth at installation

Unit: Meter (m)

Note: The water depth at the time of installation is used to calculate the installation height. Installation height = water depth at installation + real time height at installation. When setting the water depth at the time of installation, the installation height is automatically calculated and saved to the configuration.

Read the water depth at installation:

	Instruction	Description
Send	AT+INSTALLWATERDEPTHn	Read the water depth at installation
Reply	INSTALLWATERDEPTH=4.60mn	Water depth at installation is 4.60 meters

 

Set the water depth at the time of installation:

	Instruction	Description
Send	AT+INSTALLWATERDEPTH=4.6n	Water depth is set to 4.6 m during installation
Reply	AT+INSTALLWATERDEPTH=4.6n OKn	Operation successful

 

4.Height of installation

Unit: Meter (m)

Note: Set the mounting height, which is used to calculate the level. Real-time level = installation height - real time height. At the same time, installation height = water depth at installation + height at installation time. Therefore, when setting the installation height, the water depth during installation will be automatically calculated and saved to the configuration.

 

Read mounting height:

	Instruction	Description
Send	AT+INSTALLHEIGHTn	Read mounting height
Reply	INSTALLHEIGHT=9.72mn	Water depth at installation is 9.72 meters

 

Set mounting height:

	Instruction	Description
Send	AT+INSTALLHEIGHT=9.72n	Set the installation height to 9.72 m
Reply	AT+INSTALLHEIGHT=9.72n OKn	Operation successful

Note: Setting the mounting height to 0 will clear the configuration for mounting height and water depth at installation.

 

5.Read the version number

	Instruction	Description
Send	AT+VERSIONn	Read version number
Reply	VERSION=20230908n	The version number is 20230908

 

6.Read range

Unit: Meter (m)

	Instruction	Description
Send	AT+RANGEn	Read range
Reply	RANGE=40.00mn	The range is 40 meters

 

7.Read blind area

Unit: Meter (m)

	Instruction	Description
Send	AT+BLINDZONEn	Read blind area
Reply	BLINDZONE=0.335mn	The blind zone is 0.335 meters

 

8.Software reset (reboot)

	Instruction	Description
Send	AT+BOOTn	Software reset
Reply	AT+BOOTn OKn	Operation successful

 

9.Factory data reset

	Instruction	Description
Send	AT+DEFAULTn	Factory data reset
Reply	AT+DEFAULTn OKn	Operation successful

 

 

10.Frequency of acquisition

Unit: milliseconds (ms)

Note: The default acquisition frequency is 300ms, and the acquisition frequency can only be adjusted to 200ms at the earliest. (If the acquisition frequency jumps too fast, the speed of responding to the reply instructions will be slow, and the sending instructions may be incomplete, resulting in no response. In this case, the instruction can be sent again.)

Read acquisition frequency:

	Instruction	Description
Send	AT+COLLECTFREQn	Read acquisition frequency
Reply	COLLECTFREQ=200n	The acquisition frequency is 200 ms/cyclel

 

Set collection frequency:

	Instruction	Description
Send	AT+COLLECTFREQ=500n	Set the acquisition frequency to 500 ms/cycle
Reply	AT+COLLECTFREQ=500n OKn	Operation successful

 

11.Baud rate

Read baud rate:

	Instruction	Description
Send	AT+BAUDRATEn	Read baud rate
Reply	BAUDRATE=9600n	The baud rate is 9600

 

Set baud rate

	Instruction	Description
Send	AT+BAUDRATE=115200n	Set the baud rate to 115200
Reply	AT+BAUDRATE=115200n OKn	Operation successful

 

12.Calibration parameters

Unit: Millimeter (mm)

Real spatio-temporal height = sampling value -calibration parameter. Therefore, when the real space-time height is larger than a fixed value, it can be calibrated by adjusting the quasi-parameters.

Read calibration parameters:

	Instruction	Description
Send	AT+CALIBRATIONn	Read calibration parameters
Reply	CALIBRATION=16mmn	The calibration parameter is 16mm

 

Setting calibration parameters:

	Instruction	Description
Send	AT+CALIBRATION=30n	Set the calibration parameter to 30 mm
Reply	AT+CALIBRATION=30n OKn	Operation successful

13.Automatic push cycle

Unit: milliseconds (ms)

Note: When the automatic push period is >=300ms, the sensor will automatically report the real-time data. Among them, when the installation height (or water depth during installation) is set, the real-time data reported automatically is the real-time level; If the installation height is not set (or the water depth during installation), the real-time data reported automatically is the real time height.

Read the automatic push cycle:

	Instruction	Description
Send	AT+AUTOOUTDATACYCLEn	Read the automatic push cycle
Reply	AUTOOUTDATACYCLE=100n	Automatic push cycle is 100 ms (less than 200 ms, no automatic push data)

 

Set the automatic push cycle:

	Instruction	Description
Send	AT+AUTOOUTDATACYCLE=200n	Set the automatic push period to 200 milliseconds
Reply	AT+AUTOOUTDATACYCLE=200n OKn	Operation successful