Product Name: | Soil temperature and humidity salt integrated transmitter |
Product model: | WLS-06-SL |
Version: | V1.0 |
Formulator: | He Genwen |
Reviewer: | Yuan Chao |
1. Introduction
Soil temperature, humidity, salt integration sensor S-THEC-R-A-L2000, Using high-precision digital sensing chip combined with embedded processing and calculation, the temperature, humidity and conductivity of the soil are collected and measured. (EC) ，具有灵敏度高、测量精确、运行稳定、Power consumption 低、耐候性好、易于使用等特点，可广泛应用 于农业、林业、园艺种植等行业。
Each sensor is calibrated before leaving the factory and calibrated the accuracy of soil moisture to ensure that users can directly collect data during application.Sensor is based on RS-485 Standard communication of serial bus, strong anti-interference ability.
1.Functional Features
1) Adopt the independently developed radio frequency resonant circuit, with stable signal and strong penetration
2) Embedded moisture, conductivity model and compensation calculation for different soils, with high accuracy
3) Wide measurement range, good linearity and wide applicability
4) 内置存储器，none 需维护和现场校准
5) 节能省电模式支持，可以满足低Power consumption 测量场合对Power consumption 的苛刻需求
6) Completely sealed, resistant to acid and alkali corrosion, can be buried in soil or directly put into water for long-term dynamic testing
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: 0-655.35 mS/cm |
Operating temperature range | -40℃-85℃ |
Collection time | < 0.2 Second |
Power consumption | Average current: 7.0 mA@12V Peak current: 9.5 mA@12V |
Power supply voltage | DC 8-28V |
interface | RS485(MODBUS protocol ) |
Wire length | Default 2 meters (Customizable ) |
Product size | 72*45*15mm(shell )，65mm (Steel needle length ) |
二、interface illustrate
将传感器按图 1 接线示意图中的illustrate 接线，然后将传感器探头针脚插入待测量的土壤中，接通电源，即可获取测量点 Soil temperature 、Soil moisture 和Soil salt content 。
Figure 1 Sensor wiring diagram (Dimensional tolerance: ± 1.0mm)
三、通信 protocol
1.Basic communication parameters
Data bits | 8 Bit |
Parity bit | none |
Stop position | 1 Bit |
Verification code | 16 Bit CRC Inspection code |
Baud rate | 9600bps |
2.Data frame format definition
use Modbus-RTU Communication regulations, format as follows:
Address code =1 byte
Function code =1 byte
Data area =N byte
Error verification =16 Bit CRC code (Low bytes in front )
Address code: The address code is the address of the sensor, which is unique in the communication network (Factory default is 0 x01)。
Function code ：主机所发指令功能指示，Function code 0x03 读取Register data ，Function code 0x06 Write a single register.Data area: The data area is specific communication data, please note 16 bits The data is first byte. CRC 码：二byte Verification code ，低byte 在前，高byte 在后。
Host inquiry frame structure
Address code | Function code | 寄存器Starting address | Register length | Verification code 低Bit | Verification code 高Bit |
1 byte | 1 byte | 2 byte | 2 byte | 1 byte | 1 byte |
Slave Response Frame Structure
Address code | Function code | Valid number of bytes | Data area | Verification code 低Bit | Verification code 高Bit |
1 byte | 1 byte | 1 byte | …… | 1 byte | 1 byte |
3.Register data
寄存器Starting address | Data length unit is 2 Bytes | content | illustrate | operate |
0000H-0001H | 2 |
| Reservation |
|
0002H | 1 | 485 Node address | none 符号整数，1-252 | Read and write |
0003H-0009H | 7 |
| Reservation |
|
000AH | 1 | Oscillation count value | none 符号整数,0-65535 | Read only |
000BH | 1 | Soil temperature | Signed number (Expand 10 times )， -40.0~100.0℃ | Read only |
000CH | 1 | Soil moisture | none 符号数百分比，分辨率 0.1% (Expand 10 times ) | Read only |
000DH | 1 | Soil salt content | none 符号数，分辨率 0.01mS/cm | Read only |
4、Communication protocol examples and explanations
4.1.Read sensor address 0 x01 Soil temperature, soil moisture and soil salinity
Inquiry frame
Example: 01 03 00 0 B 00 03 74 09 Query 4 words from No. 1 (8 Byte)data，data Starting address 为0x000B
Address code | Function code | Starting address | The unit of data length is 2 Byte | Verification code 低Bit | Verification code 高Bit |
0x01 | 0x03 | 0x00 0x0B | 0x00 0x03 | 0x74 | 0x09 |
Answer frame (For example, the temperature is read as -10.1 ℃ ，Soil moisture is 15.5%, soil salt content is 1 mS/cm)
Address code | Function code | Valid bytes | Temperature value | Soil moisture | Soil salt content | Verification code 低Bit | Verification code 高Bit |
0x01 | 0x03 | 0x06 | 0xFF 0x9B | 0x00 0x9B | 0x00 0x64 | 0x20 | 0xA2 |
Note:
1) Temperature: When the temperature is lower than 0 ℃Upload in complement form 0 xFF9B(hexadecimal ) = -101 => temperature = -10.1℃
2) Soil moisture ：none Number of symbols
0x009B(hexadecimal ) = 155 => Soil moisture = 15.5%
3) Soil salt content ：none Number of symbols
0x0064(hexadecimal ) = 100 => Soil salt content = 1mS/cm
4.2.Modify sensor address
Example: Modify address 01 to address 02
Note: When modifying the address, only one sensor can be connected on the bus at a time. The starting address is always 0x00 0x02.
Set the frame
Address code | Function code | Starting address | New sensor address | Verification code 低Bit | Verification code 高Bit |
0xFE | 0x06 | 0x00 0x02 | 0x00 0x02 | 0xBD | 0xC4 |
Answer frame
Address code | Function code | Starting address | New sensor address | Verification code 低Bit | Verification code 高Bit |
0xFE | 0x06 | 0x00 0x02 | 0x00 0x02 | 0xA9 | 0xF8 |
4. Things to note
1. Please check whether the packaging is intact and check whether the product model is consistent with the selection.
2. Do not connect wires while powered. After completing the wiring, check for errors before powering on.。
3. Do not change the components or wires that have been soldered when the product has been used at will. If there is any change requirement, please contact the manufacturer.
4. Sensors are precision devices. Users should not disassemble or contact the surface of the transmitter with sharp objects or corrosive liquids when using them to avoid damaging the product.
5. Try not to contain metals in the soil to be tested, otherwise it will easily cause deviations in the test data.
