rs-ecth-n01 conductivitysoil temperaturemoisture three-in

Conductivity soil temperature moisture sensor 485 type instruction manual V3.0

Shandong Renke Control Technology Co., Ltd.. www.renkeer.com1

RS-ECTH-N01Conductivity soil

temperature moisturethree-in-one sensor485 type instruction

manual

Document version：V3.0



Table of Contents

1. product description............................................................................... 错误！未定义书签。

2. Instructions............................................................................................错误！未定义书签。

3.Equipment installation instructions..........................................................................................74. Configuration software installation and use........................................................................... 85. letter of agreement.................................................................................................................117. Contact information.............................................................................................................. 18

8. Document history..................................................................................错误！未定义书签。

9. Dimensions........................................................................................... 错误！未定义书签。

1. Product introduction1.1 Product OverviewThe sensor has high performance and high sensitivity, and is an important tool for observing and

studying the occurrence, evolution, improvement and dynamics of saline soil. By measuring the

dielectric constant of the soil, the true moisture content of various soils can be directly and stably

reflected. It can measure the mass percentage of soil moisture and is a method of measuring soil

moisture in accordance with current international standards.

1.2 Scope of applicationApplicable to soil moisture monitoring, scientific experiments, water-saving irrigation,

greenhouses, flowers and vegetables, grassland pastures, soil speed measurement, plant

cultivation, sewage treatment, fine agriculture and other occasions.



1.3 Technical ParametersDC power supply

(default)DC3.6-30V

Power consumption 0.2W

Operating temperature -40 - +80℃

Conductivity parameter

Range: 0-20000us/cm

Resolution: 10us/cm within 0-10000us/cm; 50us/cm

within 100000-20000us/cm

Accuracy: ±3% in the range of 0-10000 us/cm; ±5%

in the range of 10000-20000 us/cm

Soil moisture parameter

Range: 0-100%

Resolution: 0.03% within 0-50%, 1% within 50-100%

Accuracy: 2% within 0-50%, 3% within 50-100%

Soil temperature parameter Range: -40~80°C, resolution: 0.1°C, accuracy: ±0.5°C

Conductivity temperature compensation

Built-in temperature compensation sensor, compensatio

n range 0-50 °C

Protection level IP68

Probe material Anticorrosive special electrode

Sealing material Black flame retardant epoxy resin

Default cable length2 meters, cable length can be customized according to

requirements

Dimensions 45*14*135mm

Electrode length 70mm

output signal RS485 (Modbus protocol)

1.4product modelRS- Company code

ECTH- Temperature and moisture conductivity three

in one

ECH- Moisture conductivity two in one

N01- Type 485

A



B Shipping this model by

default

1.5 Product Features

1) The three parameters of soil moisture content, conductivity and temperature are combined.

2) It can also be used for the integration of water and fertilizer solutions, as well as theconductivity of other nutrient solutions and substrates.

3) The electrode is made of specially treated alloy material, which can withstand strong externalimpact and is not easy to damage.

4) Completely sealed, resistant to acid and alkali corrosion, can be buried in the soil or directlyinto the water for long-term dynamic detection.

5) High precision, fast response, good interchangeability, probe plug-in design to ensureaccurate measurement and reliable performance.

2. InstructionsSince the electrode directly measures the conductivity of the soluble salt ions in the soil, the

soil volumetric water content needs to be higher than about 20%, and the soluble ions in the soil

can correctly reflect the conductivity of the soil. In the long-term observation, the measured values

after irrigation or rainfall are closer to the true level. If the quick test is performed, the soil to be

tested can be watered first, and the water is fully infiltrated and measured.

If it is measured on a hard surface, it should be drilled first (the aperture should be smaller than the

diameter of the probe), then inserted into the soil and compacted and then measured; the sensor

should prevent severe vibration and shock, and can not be struck with hard objects. Since the

sensor is packaged in black, the sensor will cause a sharp rise in temperature (up to 50 °C) under

strong sunlight. To prevent excessive temperature from affecting the temperature measurement of

the sensor, please pay attention to shading and protection when using it in the field or in the field. .

2.1 Speed measurement method:Select the appropriate measurement location, avoid the stone, ensure that the steel needle will nottouch the hard object, throw off the topsoil according to the required measurement depth, keep theoriginal soil tightness under the ground, hold the sensor vertically into the soil, insert It is notallowed to sway from side to side. It is recommended to measure the average for multiplemeasurements within a small range of one measurement point.



2.2 Buried measurement method:Vertically dig pits with a diameter of >20cm, insert the sensor steel needle horizontally into

the pit wall at a given depth, fill the pits tightly, and stabilize for a period of time, then measureand record for several days, months or even longer.

2.3 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 thefield to prevent lightning strikes.3, do not violently bend the steel needle, do not pull the sensor lead wire, do not beat or violentlyhit the sensor.4. The sensor protection class IP68 can soak the sensor in the water.5. Due to the presence of radio frequency electromagnetic radiation in the air, it is not suitable tobe energized in the air for a long time.

3.Equipment installation instructions3.1Equipment inspection before installationEquipment List:

1. Sensor device 1

2. Certificate, warranty card, wiring instructions, etc.

3.12V/1Awaterproof power supply 1 (optional)

4.USB to 485 (optional)

5. Terminal resistance (given by multiple devices)

3.2 Interface DescriptionWide voltage power input can be 3.6~30V. When wiring the 485 signal line, note that the A\B

lines cannot be connected in reverse, and the addresses between multiple devices on the bus

cannot conflict.



3.3Wiring instructions

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

Line color Description Remarks

red Power supply 5~24V DC

black Power ground GND

yellow 485-A 485-A

white 485-B 485-B

Shield (green) Connect the negative pole of the power supply to the acquisition

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

setting mode.

4. Configuration software installation and use

4.1Software selectionOpen the package and select "Debug Software"---"Soil Temperature and Humidity



Conductivity Configuration Software", installation, installation is complete 。

4.2 parameter settings1. Select the correct COM port ("My Computer - Properties - Device Manager - Port" toview the COM port). The following figure lists the drive names of several different 485converters.

2.Connect only one device and power on separately. The shield (green) of the sensor isconnected to the power supply.

3.Click the "Serial port", click“test baud rate”，popup“abnormal test results”click “ok” ,as bellow。



4 Click”soil”,and then click”three in one soil”,as bellow



5. letter of agreement5.1 Basic communication parameters

Code 8-bit binary

Data bit 8 digits

Parity bit no

Stop bit 1 person

Error check CRC (redundant cyclic code)

Baud rate Can be set, the factory default is 9600bit / s

5.2 Data frame format definitionAdopt Modbus-RTU communication protocol, the format is as follows:

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

Address code: is the address of the transmitter, which is unique in the communication network

(factory default 0x01).

Function code: Instruction function indication sent by the host.

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 check code.

Host inquiry frame structure:

address

code

function

code

Register start

address

Register

lengthCheck 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



5.3Register addressRS-ECTH-N01-AThe bank register description is as follows

parameter name Register address

(hexadecimal/10)

parameter

Types of

Modbus

Function

number

Parameter range and

description

Defaults

Temperature value

TEMPRATURE

0x0000 /0 INT16

Read only

3/4 -4000-8000correspond

-40.00~80.00℃。

N/A

Moisture content WC 0x0001 /1 UINT16

Read only

3/4 0-10000correspond

0-100%

N/A

ConductivityEC 0x0002 /2 UINT16

Read only


0-20000us/cm

N/A

Salinity SALINITY 0x0003 /3 UINT16

Read only


0-20000mg/L

N/A

Total dissolved

solidsTDS

0x0004 /4 UINT16

Read only


0-20000mg/L

N/A

Dielectric

constantEPSILON

0x0005 /5 UINT16

Read only


0.00~82.00

N/A

Soil type SOILTYPE 0x0020 /32 UINT16

Read and

write

3/6/16 0-3

0: mineral soil

1: sand

2: clay

3: Organic soil

0:Mineral

soil

Temperature

unitTEMPUNIT

0x0021 /33 UINT16

Read and

write

3/6/16 0: Celsius °C

1: Fahrenheit °F

0

Conductance

temperature

coefficient

ECTEMPCOFF

0x0022 /34 UINT16

Read and

write

3/6/16 0-100correspond

0.0%-10.0%

20（2%）

Salinity coefficient

SALINITYCOFF

0x0023 /35 UINT16

Read and

write


0.00-1.00

55（0.55）



TDScoefficient

TDSCOFF

0x0024 /36 UINT16

Read and

write


0.00-1.00

50（0.5）

ModbusSlave address

(ADDRESS)

0x0200 /512 UINT16

Read and

write

3/6/16 1-255 1

Serial communication

baud rate

(BAUDRATE)

0x0201 /513 UINT16

Read and

write

3/6/16 0-5

0:1200bps

1:2400bps

2:4800bps

3:9600bps

4:19200bps

5:38400bps

3:9600bps


protocol

(PROTOCOL)

0x0202 /514 UINT16

Read and

write

3/6/16 0~1

0:Modbus RTU

1:Modbus ASCii

0:Modbus

RTU


check digit (PARITY)

0x0203 /515 UINT16

Read and

write

3/6/16 0-2

0: no parity

1: even parity

2: odd parity

0: no parity


data bit (DATABITS)

0x0204 /516 UINT16

Read and

write

3/6/16 1

1:8 data bits

1:8 data bits


stop bit (STOPBITS)

0x0205 /517 UINT16

Read and

write

3/6/16 0-1

0: 1 stop bit

1:2 stop bits

0: 1 stop bit


delay response

(RESPONSEDELAY)

0x0206 /518 UINT16

Read and

write

3/6/16 0-255 corresponds to

0-2550 milliseconds

The sensor responds

after receiving a host

request command for a

period of time and then

0



responding. The delay

time is the set value *10

milliseconds. When set to

0, there is no delay.


active output time

interval

(ACTIVEOUTPUTIN

TERVAL)

0x0207 /519 UINT16

Read and

write


0-255 seconds

The host does not require

a request, and the sensor

automatically sends data

at regular intervals. The

time interval is the set

value *1 second. When

set to 0, the active output

function is disabled.

0

UINT16: 16-bit unsigned integer register

INT16: 16-bit signed integer register

RS-ECTH-N01-B (default shipping this paragraph) section registerdescription

parameter name Register address

(hexadecimal/10)

paramete

r

Types of

Modbus

Function

number

Parameter range and

description

Defaults

Moisture content WC 0x0000 /0 UINT16

Read

only


0-100%

N/A

Temperature value

TEMPRATURE

0x0001 /1 INT16

Read

only

3/4 -4000-8000correspond

-40.00~80.00℃

N/A

ConductivityEC 0x0002 /2 UINT16

Read

only


0-20000us/cm

N/A

Salinity SALINITY 0x0003 /3 UINT16

Read

only


0-20000mg/L

N/A



Total dissolved solids

TDS

0x0004 /4 UINT16

Read

only


0-20000mg/L

N/A

Dielectric constant

EPSILON

0x0005 /5 UINT16

Read

only


0.00~82.00

N/A

Soil type SOILTYPE 0x0020 /32 UINT16

Read

and

write

3/6/16 0-3

0: mineral soil

1: sand

2: clay

3: Organic soil

0: mineral

soil

Temperature unit

TEMPUNIT

0x0021 /33 UINT16

Read

and

write

3/6/16 0: Celsius °C

1: Fahrenheit °F

0

Conductance

temperature

coefficient

ECTEMPCOFF

0x0022 /34 UINT16

Read

and

write


0.0%-10.0%

20（2%）

Salinity coefficient

SALINITYCOFF

0x0023 /35 UINT16

Read

and

write


0.00-1.00

55（0.55）

TDS coefficient

TDSCOFF

0x0024 /36 UINT16

Read

and

write


0.00-1.00

50（0.5）

Modbus Slave address

(ADDRESS)

0x0200 /512 UINT16

Read

and

write

3/6/16 1-255 1




baud rate

(BAUDRATE)

0x0201 /513 UINT16

Read

and

write

3/6/16 0-5

0:1200bps

1:2400bps

2:4800bps

3:9600bps

4:19200bps

5:38400bps

3:9600bps


protocol

(PROTOCOL)

0x0202 /514 UINT16

Read

and

write

3/6/16 0~1

0:Modbus RTU

1:Modbus ASCii

0:Modbus

RTU


check digit (PARITY)

0x0203 /515 UINT16

Read

and

write

3/6/16 0-2

0: no parity

1: even parity

2: odd parity

0: no parity


data bit (DATABITS)

0x0204 /516 UINT16

Read

and

write

3/6/16 1

1:8 data bits

1:8 data bits


stop bit (STOPBITS)

0x0205 /517 UINT16

Read

and

write

3/6/16 0-1

0: 1 stop bit

1:2 stop bits

0: 1 stop bit


delay response

(RESPONSEDELAY)

0x0206 /518 UINT16

Read

and

write


0-2550 milliseconds

The sensor responds after

receiving a host request

command for a period of

time and then responding.

The delay time is the set

value *10 milliseconds.

When set to 0, there is no

delay.

0




active output time

interval

(ACTIVEOUTPUTIN

TERVAL)

0x0207 /519 UINT16

Read

and

write


0-255 seconds

The host does not require

a request, and the sensor

automatically sends data

at regular intervals. The

time interval is the set

value *1 second.

AssumeWhen set to 0,

the active output function

is disabled.

0

UINT16: 16-bit unsigned integer register

INT16: 16-bit signed integer register

5.4 Communication protocol examples and explanations5.4.1 Reading the Temperature and Humidity Value of DeviceAddress 0xFEThis inquiry frame is based on the RS-ECTH-N01-A device.

Inquiry frame

address code function codestarting addres

sData length

Check code lo

w

Check code hi

gh

0x01 0x03 0x00 0x00 0x00 0x02 0xC4 0x0B

Response frame (for example, read temperature is -10.1 ° C, humidity is 65.8% RH)

address co

de

function co

de

Number of

bytes

Humidity va

lue

Temperature

value

Check code l

ow

Check code

high

0x01 0x03 0x04 0x02 0x92 0xFF 0x9B 0x5A 0x3D

Temperature: Upload in complement form when the temperature is below zero

FF9B H (hexadecimal) = -101 => temperature = -1.01°C

humidity:

292 H (hex) = 658 => humidity = 6.58% RH

6. Common problems and solutions6.1 Device cannot be connected to PLC or 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 duplicate addresses (all factory

defaults are 0x01).

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 enhancer, and increase the resistance of 120Ω terminal.6) The USB to 485 driver is not installed or damaged.7) Equipment damage.

7. Contact informationShandong Renke Measurement & Control Technology Co., Ltd.Address: 2886 Fengjing Road, High-tech Zone, Jinan City, Shandong ProvinceZip code: 250101Phone: 400-085-5807Fax: (86)0531-67805165Website: www.renkeer.comCloud platform address: www.0531yun.cn

8. Document historyV2.0 documentation updateV3.0 increase selection, update register

9. Dimensions

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