renatta RS-SD-N01-TR Soil Moisture Sensor User Guide

renatta RS-SD-N01-TR Soil Moisture Sensor

Product Information

RS-N01-TR Soil Moisture Sensor Type 485 User’s Guide

• Document Version: V1.0

Product Description
The RS-SD-N01-TR soil moisture sensor is a high-precision, high-sensitivity sensor for measuring soil moisture. It measures the dielectric constant of the soil to determine the volume percentage of soil moisture. This sensor utilizes a soil moisture measurement method that conforms to international standards, providing an accurate and stable measurement of the true moisture content in various soils.

Scope of Application
The RS-N01-TR soil moisture sensor is applicable in various fields, including soil moisture monitoring, scientific experiments, water-saving irrigation, greenhouses, grassland pastures, soil speed measurement, plant cultivation, greenhouse control, precision agriculture, water content measurement in meteorology, and particle matter measurement.

Measurement Parameters and Hardware Parameters
The sensor measures soil moisture by placing it in the pit wall at a given depth. The pit is then lightly filled and left to stabilize for a period of time. The measurements can be recorded over several days, months, or even longer.

Equipment Installation Instructions

Equipment Inspection Before Installation
Equipment List: Soil moisture temperature sensor device 1, Certificate, Warranty card, etc.

Interface Description
The sensor supports a wide voltage power input range of 5~24V. When wiring the 485 signal line, ensure that the A/B lines are not connected in reverse and that the addresses between multiple devices on the bus do not conflict.

Wiring Instructions

Wire Color Code:

• Red: Power supply (+V)
• Black: Power ground (GND)
• Yellow: 485-A
• White: 485-B
• Green (Shield): Connect the shield wire if configuring via our software

Product Usage Instruction

Configuration Software Installation and Use

Software Selection
Open the package and select Configuration Software – RS-ECTH-N01-A Configuration Software, then install it.

Parameter Settings
Select the correct COM port (My Computer – Properties – Device Manager – Port) and choose the appropriate driver for the 485 converters.

Letter of Agreement

Basic Communication Parameters

• Data Bit: 8-bit binary
• Parity Bit: None
• Stop Bit: 1 bit
• Error Check: CRC (redundant cyclic code)
• Baud Rate: 2400bit/s, 4800bit/s, 9600 bit/s (factory default)

Data Frame Format Definition
The sensor adopts Modbus-RTU communication protocol with the following format:

• Initial Structure: 4 bytes of time
• Address Code: 1 byte
• Function Code: 1 byte
• Data Area: N bytes
• Error Check: 16-bit CRC code
• End Structure: 4 bytes of time

The address code is unique to each transmitter in the communication network (default: 0x01). The function code used by this sensor is 0x03 (read register data). The data area contains the specific communication data, and the 16-bit data high byte is in front.

Product Description

Product Description
The RS-SD-N01-TR soil moisture sensor is a high-precision, high-sensitivity sensor for measuring soil moisture. By measuring the dielectric constant of the soil, the volume percentage of soil moisture can be measured, and the soil moisture measurement method conforming to the current international standard can directly and stably reflect the true moisture content of various soils.

Scope of application
Applicable to soil moisture monitoring, scientific experiments, water-saving irrigation, greenhouses, grassland pastures, soil speed measurement, plant cul va on, greenhouse control, precision agriculture, etc., while measuring the water content of water, meteorology, and various par collate matter.

Measurement parameters and hardware parameters

• Power supply: 4.5~30V DC
• Maximum power consumption: 30mA*24V DC DC
• Moisture measurement range: 0~100%
• Moisture accuracy: ±2% in the range of 0-50%; ±3% in the range of 50-100%
• Storage environment: -40 ° C ~ 60 ° C
• Response time: <1s
• Output signal: 485 signal (Modbus-RTU)
• Soil moisture measurement area: a cylinder with a radius of 7 cm centered on the center probe

Physical parameters

• Probe length: 70mm
• Probe diameter: 3mm
• Probe material: 304 stainless steel
• Sealing material: epoxy resin (black flame retardant)
• Cable length: standard two meters
• Protec on level: IP68

system framework diagram

Instructions

Quick test method：
Select the appropriate measurement location, avoid the stone, ensure that the steel needle will not touch the hard object, throw off the topsoil according to the required measurement depth, keep the original soil tightness under the ground, hold the sensor ver cally into the soil, insert It is not allowed to sway from side to side. It is recommended to measure the average for mul ple measurements within a small range of one measurement point.

Buried measurement：
Ver cally dig pits with a diameter of >20cm, insert the sensor steel needle horizontally into the pit wall at a given depth, fill the fits tightly, and stabilize for a period of me, then measure and record for several days, months or even longer.

Note:

1. The steel needle must be inserted into the soil during the measurement.
2. Avoid strong sunlight directly on the sensor and cause the temperature to be too high. Use in the field to prevent lightning strikes.
3. Do not violently bend the steel needle, do not pull the sensor lead wire, do not beat or violently hit the sensor.
4. The sensor protection class IP68 can soak the sensor in water.
5. Due to the presence of radiofrequency electromagnetic radiation in the air, it is not suitable to be energized in the air for a long time.

Equipment installation instructions

Equipment inspection before installation

Equipment List:

• Soil moisture temperature sensor device 1
• Certificate, warranty card, etc.

Interface Description
Wide voltage power input can be 5~24V. When wiring the 485 signal line, note that the A/B lines cannot be connected in reverse, and the addresses between mul ple devices on the bus cannot conflict.

Wiring instructions

(Mark: if configuration via our software, the shield wire need to connect red wire +V)

acquisition

mode, and connect the positive pole of the power supply to the setting mode.

Configuration software installation and use

Software selection
Open the package and select “Configura on Software”—“RS-ECTH-N01-A Configura on Software”, open it after installation.

parameter se ngs

1. Select the correct COM port (“My Computer – Proper es – Device Manager – Port” to view the COM port), the following figure lists the drive names of several different 485 converters.
2. Connect a separate device and power it on. The set end (shield layer) of the sensor is connected to the power supply. Click the software search device, double-click the searched device, and click Start Communication, the software will test the current device baud rate and address, the default baud rate is 9600bit / s, and the default address is 0x01.
3. Modify the address and baud rate according to the needs of use, and query the current functional status of the device.
4. If the test is not successful, please re-check the equipment wiring and 485 driver installation.

Letter of agreement

Basic communication parameters

9600bit/s

Data frame format definition

• Adopt the Modbus-RTU communication protocol, the format is as follows:
• Ini al structure ≥ 4 bytes of me
• Address code = 1 byte
• Func on code = 1 byte
• Data area = N bytes
• Error check = 16-bit CRC code
• End structure ≥ 4 bytes of me
• Address code: is the address of the transmitter, which is unique in the communication network (factory default 0x01).
• Func on code: The instruction func on of the command sent by the host. This transmitter only uses func on code 0x03 (read register data).
• Data area: The data area is the specific communication data. Note that the 16-bit data high byte is in front!
• CRC code: Two-byte checks code.
• Host inquiry frame structure:

address code| function code| Register start address| Register length|

Check code low

| Check code high
---|---|---|---|---|---
1 byte| 1 byte| 2 bytes| 2 bytes| 1 byte| 1 byte

Slave response frame structure

address code

|

function code

| Effective number of bytes|

Data area

| Second data area| Nth data area|

Check code

---|---|---|---|---|---|---
1 byte| 1 byte| 1 byte| 2 bytes| 2 bytes| 2 bytes| 2 bytes

Register address

Register address| PLC or

configuration address

| content| operating| Definition
---|---|---|---|---
0001 H| 40002| Moisture

content

| Read-only| Upload data is 100 times the

actual value

---|---|---|---|---

Communication protocol example and explanation

Read the moisture value of device address 0x01

Inquiry frame

address code

|

function code

| initial address|

Data length

| Check code lo w| Check code hi gh
---|---|---|---|---|---
0x01| 0x03| 0x00 0x01| 0x00 0x01| 0xD5| 0xCA

Response frame (for example, the read moisture value is 38.85%)

address code

| function cod e| Number of bytes|

Moisture value

| Check code lo w| Check code hi gh
---|---|---|---|---|---
0x01| 0x03| 0x02| 0x0F   0x2D| 0x7D| 0xA9

Moisture value:

• F2D (hex) = 3885 => moisture value = 38.85 %

Common problems and solutions

The device cannot connect to PLC or a computer

Possible reason:

1. The computer has multiple COM ports, and the selected port is incorrect.
2. The device address is incorrect, or there is a device with a duplicate address.
3. Baud rate, check mode, data bit, stop bit error.
4. The 485 bus is disconnected, or the A and B lines are reversed.
5. If the number of devices is too large or the wiring is too long, the power should be supplied nearby, add 485 repeater, and increase the resistance of 120Ω terminal.
6. The USB to 485 drivers is not installed or damaged.
7. Equipment damage.

Dimensions

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