Product Description:
The millimeter wave radar component consists of three main parts - radio frequency unit, processing unit, and printed board antenna. This technology is capable of penetrating through various obstacles such as light, rain, dust, fog, or frost for detecting targets. It is a small sensor that can work continuously for 24 hours, boasting features such as high integration, small size, and flexible interface.
The product level meter radar, which measures the height of the radar antenna from the liquid level, is developed based on the millimeter wave radar technology. It finds extensive applications in fields such as the measurement of water resources in rivers, reservoirs, tank level, and water level measurements.
The modules of the product level meter radar can be derived from the following devices:
- The radar ranging module that adopts 80G high-frequency chip facilitates ranging in different working conditions, including solid-state and liquid.
- The configuration lens antenna can adapt to different environments.
This technology is commonly used in multiple areas such as water conservancy engineering, sewage treatment plants, chemical plants, and petroleum plants.
Features:
● High integration
● Small volume
● Flexible interface
● It can detect targets through obstacles such as light, rain, dust, fog or frost
● Small sensors that work all day long
Technical Parameters:
| Model number | KLM800_485 |
| Frequency of measurement | 80GHz |
| Means of communication | RS_485 |
| Frequency of acquisition | 160 ms/configurable |
| Current of operation | 12V 30MA |
| Distance measurement accuracy | ±2mm |
| Communication protocol | modbus |
| Antenna beam width | ±2.75° |
| Supply voltage | 9-24V |
| Range of measurement | 3m;10m;20m;40m |
| Dimensions of modules | 47 mm diameter 64 mm diamete |
| Working humidity | 0~95% |
| Operating temperature | -20~70℃ |
Dimensions:
Applications:
● River, reservoir and other water conservancy survey
● Tank level and water level measurement
● Water conservancy project
● Sewage treatment plan
● Petroleum chemical plant
Power supply and communication
The module interface is shown in the following figure:
| Interface | Name | Function |
| 1 | Download the mouth | For STLINK firmware upgrade and simulation debugging |
| 2 | Power supply port | 3.3 V power supply, GND |
| 3 | Serial port | Used for timing command issuance |
Equipment installation instructions
When installing the module, try to keep it fixed to avoid module jitter and keep the surrounding environment as open as possible.
1. The distance between the module and the water surface is higher than 30cm to ensure that the front face of the module (antenna surface) is parallel to the measuring liquid level;
2. The distance between the module 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 1 meter;
3. choose the less volatile the location of the installation module (try not to install in the injection port and outlet undulation is big, the undulation, the greater the measurement precision, the worse).
4. Installation diagram
Guarantee within the scope of the beam without distractions, such as Banks of the river bank.
Points to note
Module installation to maintain constant as far as possible, avoid module jitter, surrounding environment to open as much as possible.
1. The distance between the module and the water surface is higher than 30cm to ensure that the front face of the module (antenna surface) is parallel to the measuring liquid level
2. The distance between the module 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. choose the less volatile the location of the installation module (try not to install in the injection port and outlet undulation is big, the undulation, the greater the accuracy of measurement, the worse))
A serial port communication protocol
| Frame head (1B) | 0XFF |
| Measuring dismissal (4B) | Height measurement (floating-point type, in centimeters) |
| Check and (1 b) | The measurement result is rounded, and the high byte and low byte are summed and the low byte is taken as the checksum |
For example, the sent data is FF 2A 4B 90 42 47, where FF is the frame header, the middle 4 bytes "2A 4B 90 42" is the distance information, and the size end sets its true information to 42 90 4B 2A (hexadimal floating point type), which is converted to decimal 72.1468 cm.
47 is a checksum, its calculation is as follows:
First to convert floating point distance 72.1468 uint32_t integer (4 bytes) to 72, in low level in two bytes 0 (HEX 0), low of 72 (HEX 48) as the checksum as frame head low, high + + integer integer to take low 8 bits, (FF + 0 x00 + 0 x48) & 0 x47 x00ff = 0.
Add: SScom test mode
Can be tested using a serial port to help (hand SScom) :
1. Use the USB serial port module connected to the computer USB interface, open SSCOM serial debugging software, choice
The correct port;
2.Send the AT + TLVS = 1 n, to convert the output string, according to send the command
"AT + START n";
3.The output string
Note: the default baud rate to 9600. If you open a string with no right side of SSCOM, click the extension to the right of "Save Parameters" to display it.
| Common instruction specification | |
| AT+STARTn | Start the command |
| AT+RESETn | Reset command |
| AT+BAUD=9600n | Baud rate command |
| AT+TIME =160n | Frame cycle (that is, change the output interval) |
| AT+READn | Check that the common configuration is correct |
| AT+TLVS=1n | Change the output (default is 0 in hexadecimal) |
Notes:
In the working state of the MCU, to configure, first send the reset command (interrupt the work), customize the input command, then send the reset command (make the configuration effective), and send the start command.
The MODBUS RTU communication protocol
1.Setup instructions: function code 0 x10
(1)Restore factory Settings
Request command:
| Device address | Function code | Starting address | Register count | Data length | Data | CRC |
| 0x7F | 0x10 | 0x10 00 | 0x00 01 | 0x02 | 0x00 00 | 0x9E 33 |
Data definition: 0 to restore the factory Settings, 1 to restart the program.
Reply data:
| Device address | Function code | Starting address | Register count | CRC |
| 0x7F | 0x10 | 0x10 00 | 0x00 01 | 0x0F 17 |
Examples:
Request: 7 f 10 10 00 00 02 00 00 9 e 33 01
Reply: 7 f 10 10 00 00 0 f 17 01
Where the data part 00 00 means to restore the factory Settings.
(2)From the machine address
Request command:
| Device address | Function code | Starting address | Register count | Data length | Data | CRC |
| 0x7F | 0x10 | 0x20 01 | 0x00 01 | 0x02 | 0x00 01 | 0x6E 21 |
Data definition: value range 1--247.
Reply data:
| Device address | Function code | Starting address | Register count | CRC |
| 0x7F | 0x10 | 0x20 01 | 0x00 01 | 0x51 D7 |
Examples:
Request: 7F 10 20 01 00 01 02 00 01 6E 21
Reply: 7 f 10 20 01 00 01 51 D7
The data part 00 01 indicates that the slave address is set to 1.
(3)Range of measurement
Request command:
| Device address | Function code | Starting address | Register count | Data length | Data | CRC |
| 0x7F | 0x10 | 0x20 46 | 0x00 02 | 0x04 | 0x00 00 41 30 | 0x40 19 |
Data definition: The data value is Float data, the unit is meters, the data length value is 4 bytes, the data format is low 16 bits of data in the front, high 16 bits of data in the back.
Reply data:
| Device address | Function code | Starting address | Register count | CRC |
| 0x7F | 0x10 | 0x20 46 | 0x00 02 | 0xA1 C3 |
Examples:
Request: 7 46 00 02 04 f 10 20 00 00 41 30 to 40 19
Re: 7F 10 20 46 00 02 A1 C3
00 00 41 30 into which the data portion of the floating-point data that is 11 meters.
(4)Measure the time interval
Request command:
| Device address | Function code | Starting address | Register count | Data length | Data | CRC |
| 0x7F | 0x10 | 0x20 2E | 0x00 01 | 0x02 | 0x03 E8 | 0xA8 C0 |
Data definition: Set the time interval of water level meter data collection, unit ms, and the minimum value is 100ms.
Reply data:
| Device address | Function code | Starting address | Register count | CRC |
| 0x7F | 0x10 | 0x20 2E | 0x00 01 | 0x60 1E |
Examples:
Request: 7 2 e f 10 20 00 02 03 01 E8 A8 C0
Reply: 7F 10 20 2E 00 01 60 1E
Among them, the data part 03 E8 is converted to decimal 1000, that is, the data acquisition interval is set to 1000ms.
(5)Communication baud rate
Request command:
| Device address | Function code | Starting address | Register count | Data length | Data | CRC |
| 0x7F | 0x10 | 0x20 02 | 0x00 01 | 0x02 | 0x25 80 | 0xB4 E2 |
Data definition: Communication baud rate: 4800,9600,19200.
Reply data:
| Device address | Function code | Starting address | Register count | CRC |
| 0x7F | 0x10 | 0x20 02 | 0x00 01 | 0xA1 D7 |
Examples:
Request: 7 f 10 20 00 02 01, 02, 25 80 B4 E2
Reply: 7F 10 20 02 00 01 A1 D7
The data part 28 80 means that the communication baud rate is set to 9600.
2.Query instruction: Function code 0x03
(1)From the machine address
Request command:
| Device address | Function code | Starting address | Register count | CRC |
| 0x7F | 0x03 | 0x20 01 | 0x00 01 | 0xD4 14 |
Reply data:
| Device address | Function code | Data length | Data | CRC |
| 0x7F | 0x03 | 0x02 | 0x00 01 | 0x51 8E |
Data definition: value range 1--247.
Examples:
Request: 7 f 03 01 00 20 01 D4 14
Reply: 7 f 03 02 0 01 51 8 e
The data part 00 01 means that the slave address is 1.
(2)Range ability
Request command:
| Device address | Function code | Starting address | Register count | CRC |
| 0x7F | 0x03 | 0x20 46 | 0x00 02 | 0x24 00 |
Reply data:
| Device address | Function code | Data length | Data | CRC |
| 0x7F | 0x03 | 0x04 | 0x00 00 41 30 | 0x54 70 |
Data definition: The data value is Float data, the unit is meters, the data length value is 4 bytes, the data format is low 16 bits of data in the front, high 16 bits of data in the back.
Examples:
Request: 7 46 f 03 20 00 00 02 24
Reply: 7 f 03 04 00 00 41 30 54, 70
The data part 00 00 41 30 is converted to floating point data, which is 11 meters.
(3) Baud rate of communication
Request command:
| Device address | Function code | Starting address | Register count | CRC |
| 0x7F | 0x03 | 0x20 02 | 0x00 01 | 0x24 14 |
Reply data:
| Device address | Function code | Data length | Data | CRC |
| 0x7F | 0x03 | 0x02 | 0x28 80 | 0x8D 7E |
Examples:
Request: 7 f 20 00 02 03 01 24 14
Re: 7F 03 02 25 80 8B 7E
The data part 28 80 means the communication baud rate is 9600.
(4)Measure the time interval
Request command:
| Device address | Function code | Starting address | Register count | CRC |
| 0x7F | 0x03 | 0x20 2E | 0x00 01 | 0xE5 D0 |
Reply data:
| Device address | Function code | Data length | Data | CRC |
| 0x7F | 0x03 | 0x02 | 0x03 E8 | 0x90 F0 |
Data definition: Set the time interval of water level meter data collection, unit ms, and the minimum value is 100ms.
Examples:
Request: 7F 03 20 2E 00 01 EF C3
Reply: 7 f 03 02 90 F0 03 E8
Among them, the data part 03 E8 was converted to decimal 1000, indicating that the data acquisition interval was 1000ms.
(5)Query measurement results
Request command:
| Device address | Function code | Starting address | Register count | CRC |
| 0x7F | 0x04 | 0x0A 0F | 0x00 02 | 0x48 0E |
Reply data:
| Device address | Function code | Data length | Data | CRC |
| 0x7F | 0x04 | 0x04 | 0x04 19 3F 9E | 0x25 2C |
Data Definition: Data value is Float type data, the unit is meters. Data length value is 4 bytes, data format for the low 16 bits of data in the former, high 16 bit data behind. The meaning of the measurement result is associated with the type of measurement, and the default is the water level.
Examples:
Request: 7 4 0 f a 48 0 0 f 00 02 e
Reply: 7 f 04 04 04 19 3 f 9 e 25 2 c
The data part 04 19 3F 9E is converted to floating point data that is 1.2345 meters.
19049 e3f, in one place, with right high position.
(6)Query version
Request command:
| Device address | Function code | Starting address | Register count | CRC |
| 0x7F | 0x03 | 0x20 04 | 0x00 02 | 0x48 14 |
Reply data:
| Device address | Function code | Data length | Data | CRC |
| 0x7F | 0x03 | 0x04 | 0x20 23 05 12 | 0x1D 63 |
Data definition: The data is in BCD encoding format, 0x20 0x23 0x05 0x12, which means data 20230512.
(7)Broadcast address query devices
Request command:
| Device address | Function code | Starting address | Register count | CRC |
| 0xFF | 0x03 | 0x20 01 | 0x00 01 | 0xCB D4 |
Reply data:
| Device address | Function code | Data length | Data | CRC |
| 0x7F | 0x03 | 0x02 | 0x00 7F | 0xD1 AE |
Data definition: 0x7F in the data is the 485 address of the device.
Support and Services:
Our Accelerometer Sensor product technical support and services include:
- Assistance with installation and setup
- Troubleshooting and diagnostics
- Repair and replacement services
- Technical documentation and resources
Packing and Shipping:
Product Packaging:
The accelerometer sensor will be packaged in a sturdy cardboard box with cushioning material to prevent damage during transit. The box will also be labeled with the product name and any necessary handling instructions.
Shipping:
The product will be shipped via standard ground shipping unless expedited shipping is requested and paid for by the customer. Shipping costs will be calculated based on the destination and weight of the package. Customers will receive a tracking number once the package has been shipped.
