SZ2802
www.sonbus.com
SZ2802
Wireless soil moisture and temperature
http:// www.sonbus.com
sensor
Product Overview
SZ2802 Wireless Combo soil temperature and moisture detection sensors
buried in the soil and long-term use of the dam, on the surface and deep soil
moisture sentinel surveillance and on-line measurements, also called farmland
moisture detector. Using 433 MHz wireless data transmission, remote on-line
monitoring of soil moisture to achieve the purpose. Used in conjunction with a
lithium battery pack, moisture and temperature can be used as sentinel
surveillance or mobile measurement instruments.
Parameters
Parameter
Technical indicators
Battery voltage range
DC4.5-5.5V
Moisture measurement range
0 to 24%
Moisture measurement accuracy
3% FSD
Temperature
measurement
-30 ℃ ~ +70 ℃
measurement
0.5 ℃ (0 ℃ ~ +70 ℃)
ORDERING
INFORMATION
range
Temperature
accuracy
Type
Probe length
<65mm
Diameter of the probe
Φ3mm
Probe Materials
Stainless steel
Sealing materials
Epoxy
Response time
<1 second
Measure settling time
<2 seconds
The output signal
433Mhz
R emar k
SZ2802
Wireless Water Temperature Sensor
SZ2802
Wireless moisture sensor
Dimensions
Wireless
MODBUS-RTU
protocol
Measuring frequency
100MHz
Measurement area
Central probe centered around the area
of 30mm height 70mm
Power consumption
<0.5W
Operating Environment:
-30 ℃ ~ +85 ℃
Dimensions
70 × 45 × 18mm (excluding probe)
SONBEST Components Industries, SHANGHAI, CHINA
Publication Order Number:
February, 2014 − Rev. 3
SZ2802
1
www.sonbus.com
Interface Description
of dry mass. It simply is: (wet weight - dry weight) / dry weight
Equipment for the wireless transmission interface, the
device has a 2-pin charging connector and an antenna
connector. Recommend the use of standard power supply
× 100%, the percentage of moisture content of the soil quality
of free water in the soil accounted for the total mass. Actual
use, when the soil moisture content over 24% of the soil has
been saturated and there was an overflow of water status,
line.
thus detecting moisture content of more than 24% of the value
Specific colors and pin definitions as follows:
Explanation
Positive
Conductors
power
1
supply
Technical Note
The
positive
supply
voltage
DC5V
of no practical significance. Suitable moisture content of the
soil necessary for the normal growth of crops within the range
of 12% -20%. Therefore only needs to detect the moisture
content below 24% moisture saturation on irrigation and meet
the actual needs of the various production. 0-24% as a result
Negative
power
supply
Negative
2
supply
voltage DC5V
of dynamic detection range of the sensor is expressed as soil
moisture 0-100% output. The actual output moisture detection
range of 0-24%.
Wireless Networking
As shown below, the water system consists of multiple
wireless temperature sensors and a wireless acquisition
components. Wireless acquisition supports 1-250 wireless
temperature sensors. Working principle of the system is a
Wiring:
query methods, namely, PC software for data queries for each
Each wireless sensor by the water temperature sensor, a
node, the node data submitted in response to the command.
lithium battery, an antenna composed of three parts. Please
check the lithium battery before use. Make sure the battery
has enough power and then put into use. The standard Li-ion
battery is 4000mAh, the device power consumption is about
40mA, so theoretically the longest time of 100 hours.
Communication protocol
Equipment operations or restore commands are all
hexadecimal data. The default baud rate: 9600,8, n, 1.
The basic command format:
[Device Address] [Function code] [starting address: 2
bytes] [Data Length: 2 bytes] [CRC16 checksum: 2 bytes]
Meaning is as follows:
A, Device Address: Device address range is 1-35, 250
Moisture content description
general-purpose query that 0xFA address, when I do not know
Soil moisture content: the Soil measured amount of water
under conditions to the difference before baking quality and
the device address, the availability of generic query address
queries.
drying the soil quality of the representation of the percentage
SONBEST Components Industries, SHANGHAI, CHINA
Publication Order Number:
February, 2014 − Rev. 3
SZ2802
2
www.sonbus.com
B, function code: function code different needs of different
applications, such as data input register 3 for the query.
C, the starting address: query or operation register start
address.
Reply data on patients : 01 1,02 meter data table address
length is 2 bytes , because the length of the measuring point
two bytes of data , such as data for the first 07 1C, folded into
10 hex is : 1820 , because the module with a resolution of
D, Data length: the read length.
0.01 , the value must be divided by 100 , that is the actual
E, CRC checksum: CRC16 checksum, high front and low
value of 18.20%, 08 2C temperature value , the same
in the post.
calculation method .
1) parameter query (function code 0x03)
In the configuration king or force control configuration
[ Device Address ] [ 03 ] [ 00 ] [ Data Length ] [CRC16
checksum : 2 bytes ]
software
,
the
moisture
register
address
:
4x0001,
temperature value register address : 4x0002
Device response:
2 ) Range scaling factor ( Function number : 0x06
[ Device Address ] [ Order ] [ number of bytes returned ]
Auxiliary Order No. : 0x0A)
[ Data ] [CRC16 checksum ]
When the device is a whole range zoom in or out , we can
Response data meaning is as follows :
use this parameter to adjust the display value of the overall
A, the number of bytes returned : indicates the number of
scaling.
bytes of data , the data value is 1,2 ... n of the n .
Send command format :
B, the data length: 1-7 range .
[ Device Address ] [ Order : 0x06] [ Auxiliary Order No. : 0x0A]
Sensor built seven data registers.
[00 00] [ parameter values: 2 bytes ] [CRC16]
Register
Meaning
Type
Address
Value
The actual
For example, the device address range to change the zoom
range (10
value
factor of 1.05 , the actual parameters to be multiplied by
10000 , the decimal value of 10500 , which corresponds to
hex):
4x0001
4x0002
4x0003
Moisture
Unsigned
0-10000
content
int
Temperat
Unsigned
-5500-12
ure
int
500
Range
Unsigned
2000-500
scaling
int
00
0-100
(0XFA, ie, 250 ) to set up, of course, You can also directly
-55-125
0.2-5
Device response format : [ Device Address ] [ 00 ] [ parameter
Offset
Unsigned
calibratio
int
-100-100
-10.00-10.
values: 2 bytes ] [CRC16]
00
If the device responds correctly , indicating the success of the
parameter settings
Display
Unsigned
the
int
0-10000
0-100
3 ) offset calibration value ( Function number : 0x06
Auxiliary Order No. : 0x0A)
maximum
4x0006
4x0007
Device response : 01 00 29 04 1F 8B
Response format:
n value
4x0005
address the current device to operate the equipment :
Command : FA 06 0A 00 29 04 81 CA
factor
4x0004
2904 hex data , we can use the device address wildcard value
moisture
When the value of the entire display is too large or too small ,
Regardle
Unsigned
we can pass the occasion can count , the overall value of the
ss
int
of
0-1000
0-10
offset of the display
display
Send command format :
minimum
[ Device Address ] [ Order : 0x06] [ Auxiliary Order No. : 0x0A]
Device
Unsigned
Address
int
1-35
1-35
[02 00] [ parameter values: 2 bytes ] [CRC16]
For example, the overall value of the offset will be displayed
For example : Query on the 1st equipment moisture and
-3% Rh, the coefficient is -3.00 , the actual parameters to be
multiplied by 100 , that is a decimal value -300 ,
temperature sensor data :
corresponding hexadecimal data FE D4, we can use the
Send : 01 03 00 00 00 02 C4 0B
device address wildcard value (0XFA , ie 250 ) to set up, of
Response : 01 03 02 07 1C 08 2C [CRC16]
SONBEST Components Industries, SHANGHAI, CHINA
Publication Order Number:
February, 2014 − Rev. 3
SZ2802
3
www.sonbus.com
course, can also be used directly address the current device
Device response: 01 06 01 2C E1 94
to operate the equipment :
Response format:
Device response: 01 02 FE D4 E0 27
Device response format: [Device Address] [00] [parameter
Response format:
values: 2 bytes] [CRC16]
Device response format: [Device Address] [00] [parameter
If the device responds correctly, indicating the success of the
values: 2 bytes] [CRC16]
parameter settings
If the device responds correctly, indicating the success of the
6) Set the device address (Function number: 0x06
parameter settings
Auxiliary Order No.: 0x0A)
4) Moisture display maximum (Function number: 0x06
We can use this parameter to set the device address of the
Auxiliary Order No.: 0x0A)
device, the value range is 1-35, note that for the convenience
We can use this parameter to set the maximum moisture
of users of the device address queries with wildcard address
meter can be displayed.
250 devices, namely 0xFA, when multiple devices on the bus,
Send command format:
Please do not use the wildcard address parameters of the
[Device Address] [Order: 0x06] [Auxiliary Order No.: 0x0A] [04
device operation.
00] [parameter values: 2 bytes] [CRC16]
Send command format:
For example, to display the value of the maximum allowable
[Device Address] [Order: 0x06] [Auxiliary Order No.: 0x0A] [08
moisture content of 100%, and that the real target parameters
00] [parameter values: 2 bytes] [CRC16]
as 100.00, the actual parameters to be multiplied by 100, that
For example, do not know the current device address, you can
is a decimal value is 10000, which corresponds to 2710 hex
use the wildcard address directly address the device settings,
data, we can use the device address wildcard value (0XFA , ie
we will address the current setting is set to 1, the command is:
250) to set up, of course, can also be used directly address
FA 06 0A 08 00 01 DF 9B
the current device to operate the equipment:
Device response: 01 08 00 01 41 DA
Command: FA 06 0A 04 27 10 C4 64
Response format:
Equipment Response: 010427100025
Device response format: [Device Address] [00] [parameter
Response format:
values: 2 bytes] [CRC16]
Device response format: [Device Address] [00] [parameter
If the device responds correctly, indicating the success of the
values: 2 bytes] [CRC16]
parameter settings
If the device responds correctly, indicating the success of the
parameter settings
5) the minimum water display (Function No.: 0x06
Auxiliary Order No.: 0x0A)
We can use this parameter to set the minimum moisture
meter can be displayed when this is less than this value are
displayed as 0.
Send command format:
[Device Address] [Order: 0x06] [Auxiliary Order No.: 0x0A] [06
00] [parameter values: 2 bytes] [CRC16]
For example, to display the value of the maximum allowable
moisture content of 3%, and that the real target parameter of
3.00, the actual parameters to be multiplied by 300, which is
300 in decimal, hexadecimal data corresponding to 01 2C, we
can use the device address wildcard value (0XFA , ie 250) to
set up, of course, can also be used directly address the
current device to operate the equipment:
Command: FA 06 0A 06 01 2C 7F D5
SONBEST Components Industries, SHANGHAI, CHINA
Publication Order Number:
February, 2014 − Rev. 3
SZ2802
4
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