Renke RS-ECTH-N01 User manual

Conductivity soil temperature moisture sensor 485 type instruction manual V3.0
Shandong Renke Control Technology Co., Ltd.
.www.renkeer.com
1
RS-ECTH-N01
Conductivity soil
temperature moisture
three-in-one sensor
485 type instruction
manual
Document version：V3.0

Conductivity soil temperature moisture sensor 485 type instruction manual V3.0
Shandong Renke Control Technology Co., Ltd.
.www.renkeer.com
2

Conductivity soil temperature moisture sensor 485 type instruction manual V3.0
Shandong Renke Control Technology Co., Ltd.
.www.renkeer.com
3
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..........................................................................................7
4. Configuration software installation and use........................................................................... 8
5. letter of agreement.................................................................................................................11
7. Contact information.............................................................................................................. 18
8. Document history..................................................................................错误！未定义书签。
9. Dimensions........................................................................................... 错误！未定义书签。
1. Product introduction
1.1 Product Overview
The 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 application
Applicable 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.

Conductivity soil temperature moisture sensor 485 type instruction manual V3.0
Shandong Renke Control Technology Co., Ltd.
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1.3 Technical Parameters
DC 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 co
mpensation
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 length
2 meters, cable length can be customized according to
requirements
Dimensions
45*14*135mm
Electrode length
70mm
output signal
RS485 (Modbus protocol)
1.4product model
RS-
Company code
ECTH-
Temperature and moisture conductivity three
in one
ECH-
Moisture conductivity two in one
N01-
Type 485
A

Conductivity soil temperature moisture sensor 485 type instruction manual V3.0
Shandong Renke Control Technology Co., Ltd.
.www.renkeer.com
5
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 the
conductivity of other nutrient solutions and substrates.
3) The electrode is made of specially treated alloy material, which can withstand strong external
impact and is not easy to damage.
4) Completely sealed, resistant to acid and alkali corrosion, can be buried in the soil or directly
into the water for long-term dynamic detection.
5) High precision, fast response, good interchangeability, probe plug-in design to ensure
accurate measurement and reliable performance.
2. Instructions
Since 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 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 vertically into the soil, insert It is not
allowed to sway from side to side. It is recommended to measure the average for multiple
measurements within a small range of one measurement point.

Conductivity soil temperature moisture sensor 485 type instruction manual V3.0
Shandong Renke Control Technology Co., Ltd.
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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 measure
and record for several days, months or even longer.
2.3 Note:

Conductivity soil temperature moisture sensor 485 type instruction manual V3.0
Shandong Renke Control Technology Co., Ltd.
.www.renkeer.com
7
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 the water.
5. Due to the presence of radio frequency electromagnetic radiation in the air, it is not suitable to
be energized in the air for a long time.
3.Equipment installation instructions
3.1Equipment inspection before installation
Equipment List:
1. Sensor device 1
2. Certificate, warranty card, wiring instructions, etc.
3.12V/1A waterproof power supply 1 (optional)
4.USB to 485 (optional)
5. Terminal resistance (given by multiple devices)
3.2 Interface Description
Wide 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.

Conductivity soil temperature moisture sensor 485 type instruction manual V3.0
Shandong Renke Control Technology Co., Ltd.
.www.renkeer.com
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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 selection
Open the package and select "Debug Software"---"Soil Temperature and Humidity

Conductivity soil temperature moisture sensor 485 type instruction manual V3.0
Shandong Renke Control Technology Co., Ltd.
.www.renkeer.com
9
Conductivity Configuration Software", installation, installation is complete 。
4.2 parameter settings
1. Select the correct COM port ("My Computer - Properties - Device Manager - Port" to
view the COM port). The following figure lists the drive names of several different 485
converters.
2.Connect only one device and power on separately. The shield (green) of the sensor is
connected to the power supply.
3.Click the "Serial port", click“test baud rate”，popup“abnormal test results”click “ok” ,
as bellow。

Conductivity soil temperature moisture sensor 485 type instruction manual V3.0
Shandong Renke Control Technology Co., Ltd.
.www.renkeer.com
10
4 Click”soil”,and then click”three in one soil”,as bellow

Conductivity soil temperature moisture sensor 485 type instruction manual V3.0
Shandong Renke Control Technology Co., Ltd.
.www.renkeer.com
11
5. letter of agreement
5.1 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 definition
Adopt 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
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

Conductivity soil temperature moisture sensor 485 type instruction manual V3.0
Shandong Renke Control Technology Co., Ltd.
.www.renkeer.com
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5.3Register address
RS-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
3/4
0-20000correspond
0-20000us/cm
N/A
Salinity SALINITY
0x0003 /3
UINT16
Read only
3/4
0-20000correspond
0-20000mg/L
N/A
Total dissolved
solidsTDS
0x0004 /4
UINT16
Read only
3/4
0-20000correspond
0-20000mg/L
N/A
Dielectric
constantEPSILON
0x0005 /5
UINT16
Read only
3/4
0-8200correspond
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
3/6/16
0-100correspond
0.00-1.00
55（0.55）

Conductivity soil temperature moisture sensor 485 type instruction manual V3.0
Shandong Renke Control Technology Co., Ltd.
.www.renkeer.com
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TDScoefficient
TDSCOFF
0x0024 /36
UINT16
Read and
write
3/6/16
0-100correspond
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
Serial communication
protocol
(PROTOCOL)
0x0202 /514
UINT16
Read and
write
3/6/16
0~1
0:Modbus RTU
1:Modbus ASCii
0:Modbus
RTU
Serial communication
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
Serial communication
data bit (DATABITS)
0x0204 /516
UINT16
Read and
write
3/6/16
1
1:8 data bits
1:8 data bits
Serial communication
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
Serial communication
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

Conductivity soil temperature moisture sensor 485 type instruction manual V3.0
Shandong Renke Control Technology Co., Ltd.
.www.renkeer.com
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responding. The delay
time is the set value *10
milliseconds. When set to
0, there is no delay.
Serial communication
active output time
interval
(ACTIVEOUTPUTIN
TERVAL)
0x0207 /519
UINT16
Read and
write
3/6/16
0-255 corresponds to
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 register
description
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
3/4
0-10000correspond
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
3/4
0-20000correspond
0-20000us/cm
N/A
Salinity SALINITY
0x0003 /3
UINT16
Read
only
3/4
0-20000correspond
0-20000mg/L
N/A

Conductivity soil temperature moisture sensor 485 type instruction manual V3.0
Shandong Renke Control Technology Co., Ltd.
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Total dissolved solids
TDS
0x0004 /4
UINT16
Read
only
3/4
0-20000correspond
0-20000mg/L
N/A
Dielectric constant
EPSILON
0x0005 /5
UINT16
Read
only
3/4
0-8200correspond
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
3/6/16
0-100correspond
0.0%-10.0%
20（2%）
Salinity coefficient
SALINITYCOFF
0x0023 /35
UINT16
Read
and
write
3/6/16
0-100correspond
0.00-1.00
55（0.55）
TDS coefficient
TDSCOFF
0x0024 /36
UINT16
Read
and
write
3/6/16
0-100correspond
0.00-1.00
50（0.5）
Modbus Slave address
(ADDRESS)
0x0200 /512
UINT16
Read
and
write
3/6/16
1-255
1

Conductivity soil temperature moisture sensor 485 type instruction manual V3.0
Shandong Renke Control Technology Co., Ltd.
.www.renkeer.com
16
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
Serial communication
protocol
(PROTOCOL)
0x0202 /514
UINT16
Read
and
write
3/6/16
0~1
0:Modbus RTU
1:Modbus ASCii
0:Modbus
RTU
Serial communication
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
Serial communication
data bit (DATABITS)
0x0204 /516
UINT16
Read
and
write
3/6/16
1
1:8 data bits
1:8 data bits
Serial communication
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
Serial communication
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 responding.
The delay time is the set
value *10 milliseconds.
When set to 0, there is no
delay.
0

Conductivity soil temperature moisture sensor 485 type instruction manual V3.0
Shandong Renke Control Technology Co., Ltd.
.www.renkeer.com
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Serial communication
active output time
interval
(ACTIVEOUTPUTIN
TERVAL)
0x0207 /519
UINT16
Read
and
write
3/6/16
0-255 corresponds to
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 explanations
5.4.1 Reading the Temperature and Humidity Value of Device
Address 0xFE
This inquiry frame is based on the RS-ECTH-N01-A device.
Inquiry frame
address code
function code
starting addres
s
Data 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 solutions
6.1 Device cannot be connected to PLC or computer

Conductivity soil temperature moisture sensor 485 type instruction manual V3.0
Shandong Renke Control Technology Co., Ltd.
.www.renkeer.com
18
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 120Ωterminal.
6) The USB to 485 driver is not installed or damaged.
7) Equipment damage.
7. Contact information
Shandong Renke Measurement & Control Technology Co., Ltd.
Address: 2886 Fengjing Road, High-tech Zone, Jinan City, Shandong Province
Zip code: 250101
Phone: [phone]
Fax: [phone]
Website: www.renkeer.com
Cloud platform address: www.0531yun.cn
8. Document history
V2.0 documentation update
V3.0 increase selection, update register
9. Dimensions

Conductivity soil temperature moisture sensor 485 type instruction manual V3.0
Shandong Renke Control Technology Co., Ltd.
.www.renkeer.com
19