Product Specification Book
Product Name | Soil temperature moisture salt sensor |
Product model | S-THEC-R-A-L2000 |
Version | V1.4 |
Formulator | GW.H |
Reviewer | CY |
Modify the record table:
Version | Change content | Change people | Change date |
V1.0 | New | GW.H | 2021-08-20 |
V1.1 | Revision description | GW.H | 2023-06-13 |
V1.2 | Modified error on the serial number | GW.H | 2023-07-24 |
V1.3 | Updated voltage range and wiring diagram | GW.H | 2023-11-20 |
V1.4 | Updated product waterproofing level | GW.H | 2023-12-14 |
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one, Introduction
Soil temperature moisture salt sensor S-THEC-R-A-L2000, Using high-precision digital sensing chip combined with embedded processing and calculation, the temperature, moisture and conductivity of the soil are collected and measured ( EC）， It has the characteristics of high sensitivity, accurate measurement, stable performance, low power consumption, good weather resistance, and easy to use. It can be widely used in agriculture, forestry, horticultural planting and other industries.
Before leaving the factory, the temperature coefficient calibration and soil moisture accuracy and conductivity accuracy calibration are carried out to ensure that customers can directly collect data when using it.This product is based on RS-485 Standard communication of serial bus, strong anti-interference ability.
1.Functional Features
1.1 Wide measurement range, Linear Good degree and wide applicability ；
1.2 Built-in memory, no maintenance and on-site calibration required ；
1.3 support Energy-saving and power-saving mode, Satisfied low Power consumption Application scenarios of want beg ；
1.4 Adopt the independently developed radio frequency resonant circuit, with stable signal and strong penetration ；
1.5 Embedded moisture, conductivity model and compensation calculation for different soils, with high accuracy ；
1.6 Completely sealed, resistant to acid and alkali corrosion, can be buried in the soil or directly put into water for long-term dynamic testing, satisfying IP68Require.
2.Main technical indicators
soil Temperature measurement | Typical Accuracy: 0.5℃ High precision range: 0-50℃ Resolution: 0.1℃ Range: -40℃-85℃ |
soil Moisture Content measurement | Typical Accuracy: 3% Resolution: 0.1% Range: 0-100% |
Conductivity Salt Measurement | Typical Accuracy: 3% Resolution: 0.01 mS/cm Range: 0-20 mS/cm |
Operating temperature range | -40℃-85℃ |
Collection time | < 0.2Second |
Power consumption | average Current :10.5mA@12V Peak current :＜100mA@12V |
Power supply voltage | DC 3-28V |
interface | RS485(MODBUS protocol ) |
Wire length | default 2Meter (customizable) |
product size | 73*45*15mm(shell )，60mm（ Steel needle length) |
two, Interface description
Press the sensor picture 1Wiring diagram Wire the sensor probe in the instructions Needle insert To be measured In the soil, Connect Power supply to obtain measurement points Soil temperature, soil Moisture and soil salinity values 。
picture 1 Sensor wiring diagram (Dimensional tolerance: ±1.0mm)
3. Communication protocol
1.Basic communication parameters
Data bits | 8Bit |
Parity bit | none |
Stop position | 1Bit |
check code | 16Bit CRCInspection code |
Baud rate | 9600bps |
2.Data frame format definition
use Modbus-RTU Communication regulations, format as follows:
Address code =1byte
Function code =1byte
Data area =Nbyte
Error verification =16Bit CRC Code (low bytes are in front)
Address code: Address code The address of the sensor is unique in the communication network (factory default for 0x01）。
Function code: Function instructions sent by the host, function code 0x03 Read register data, function code 0 x06 Write a single register.
Data area: The data area is specific communication data, please note 16bits The data is first byte. CRC Code: Two-byte check code, the low byte is in front and the high byte is in the back.
Host inquiry frame structure
Address code | Function code | Register start address | Register length | Check code low | Verification code high |
1byte | 1byte | 2byte | 2byte | 1byte | 1byte |
Slave Response Frame Structure
Address code | Function code | Valid number of bytes | Data area | Check code low | Verification code high |
1byte | 1byte | 1byte | …… | 1byte | 1byte |
3.Register data
Register start address | The unit of data length is 2Bytes | content | illustrate | operate |
0000H-0001H | 2 |
| Reservation |
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0002H | 1 | 485Node address | Unsigned integers, 1-252 | Read and write |
0003H-0009H | 7 |
| Reservation |
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000AH | 1 | Oscillation count value | Unsigned integers ,0-65535 | Read only |
000BH | 1 | soil temperature | Signed number (enlarge 10Time) | Read only |
000CH | 1 | soil Moisture | Unsigned percentage （expand 10Time) | Read only |
000DH | 1 | Soil salt content | Unsigned number, resolution 0.01mS/cm | Read only |
4.Communication protocol examples and explanations
4.1.Read sensor address 0 x01 soil temperature, soil Moisture and soil salt
Inquiry frame
example: 01 03 00 0B 00 03 74 09 Query No. 1 No. 4 Character( 8 Byte） Data, the starting address of data is 0x000B
Address code | Function code | Starting address | The unit of data length is 2Byte | Check code low | Verification code high |
0x01 | 0x03 | 0x00 0x0B | 0x00 0x03 | 0x74 | 0x09 |
Response frame (for example, read the temperature is -10.1℃，soil Moisture for 15.5%，The soil salt content is 1 mS/cm）
Address code | Function code | Valid number of bytes | Temperature value | Soil moisture | Soil salt content | Check code low | Verification code high |
0x01 | 0x03 | 0x06 | 0xFF 0x9B | 0x00 0x9B | 0x00 0x64 | 0x20 | 0xA2 |
Note:
1) Temperature: When the temperature is lower than 0℃Upload in complement
0xFF9B(hexadecimal ) = -101 => temperature = -10.1℃
2) soil Moisture ：Unsigned number
0x009B(hexadecimal ) = 155 => soil Moisture = 15.5%
3) Soil salt content: None symbol Number of numbers
0x0064(hexadecimal ) = 100 => Soil salt content = 1mS/cm
4.2.Modify sensor address
example: Put the address 01Modified to address 02
Note: When modifying the address, only one sensor can be connected to the bus. The starting address has always been 0x00 0x02
Set the frame
Address code | Function code | Starting address | New sensor address | Check code low | Verification code high |
0xFE | 0x06 | 0x00 0x02 | 0x00 0x02 | 0xBD | 0xC4 |
Answer frame
Address code | Function code | Starting address | New sensor address | Check code low | Verification code high |
0xFE | 0x06 | 0x00 0x02 | 0x00 0x02 | 0xBD | 0xC4 |
4. Things to note
1. Do not connect live wires. Power can only be turned on after the wiring is correct after checking. ；
2. Please check whether the packaging is intact and check whether the product model is consistent with the selection ；
3. Try not to contain metals in the soil to be tested, otherwise it will easily cause deviations in the test data;
4. Do not change the components or wires that have been soldered when the product has been shipped at the factory. ，If there is any change requirement, please contact the manufacturer;
5. The sensor is a precision device. Users should not disassemble it by themselves or contact it with sharp objects or corrosive liquids when using it. This product Surface to avoid damage to the product 。
