Sentec WS303U User manual

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WS303U Ultrasonic Wind Speed & Direction Sensor
Product Manual

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WORKING PRINCIPLE
Ultrasonic wind measurement is an application of ultrasonic detection technology in the gas medium. It uses the
influence of air flow (wind) on the propagation speed of ultrasonic in the air to measure the wind speed. Compared with
the conventional wind cup or rotor anemometer, the most important feature of this method is that the whole wind
measuring system has no mechanical rotating parts and belongs to non inertial measurement, so it can accurately
measure the high frequency component of gust pulsation in natural wind.
Ultrasonic wind speed and direction transmitter uses four ultrasonic probes to send and receive ultrasonic waves in
two-dimensional plane circularly. The principle that ultrasonic waves are affected by wind speed and thus increase or
decrease is used to measure wind speed and direction.
INTRODUCTION
WS303U small ultrasonic wind speed and direction sensor is a wind speed and direction measuring instrument based
on the ultrasonic principle. It uses the acoustic pulse sent to measure the phase difference of the receiving end to
calculate the wind speed and direction. The sensor can measure the instantaneous value of wind speed and direction
at the same time. It is widely used in the fields of meteorology, ocean, environment, airport, port, laboratory, industry,
agriculture and transportation.
The equipment with built-in electronic compass no longer has the requirement of orientation during installation. It only
needs to ensure the horizontal installation. The whole machine shell is made of high-quality ABS material, which has
the characteristics of light weight, no moving parts, strong and durable.
FEATURES
•No angle limit, wind speed and direction data can be measured at the same time
•No moving parts, small wear and long service life
•The random error identification technology can ensure the low discrete error of measurement and make the output
more stable under strong wind
•Using ABS engineering plastic shell, the design is light, portable, easy to install and disassemble
•Analog signal output, 4 ~ 20mA, 0 ~ 5V, 0 ~ 10V optional
•485 communication interface, standard Modbus RTU communication protocol, communication address and baud rate
can be set, and the farthest communication distance is 2000 meters
•The equipment with built-in electronic compass can be installed horizontally without direction requirement
•No maintenance and field calibration required
APPEARANCE SKETCH
RS485 Type
Analog Type

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INSTALLATION INSTRUCTION
1. Inspection before equipment installation
Equipment list:
1 sensor equipment
Certificate and warranty card
One white bracket, two M4 * 10 screws and nuts, and three M5 nuts
2. Installation method
Beam installation (optional)
The installation of the device without electronic compass is shown in the figure below. The device with built-in
electronic compass only needs to be installed horizontally.
Supply voltage
10-30V DC (0-10V output is powered by 24 V)
Power consumption
485：0.12W
4~20mA/0~5V/0~10V：1.2W
Range
Wind speed
0 ~ 40m / S (customizable),0.5m starting wind speed
Wind direction
0~360°
Accuracy
Wind speed
±0.5+2%FS
Wind direction
±3°
Resolution
Wind speed
0.01 m/s
Wind direction
1°
Working environment
-40～80℃，0～95%RH
Wind resistance
75 m/s
Response time
1S
IP grade
485 type: IP65, analog type: IP54
Signal output
485 (Modbus RTU protocol)"
4 ~ 20mA current output"
0 ~ 10V, 0 ~ 5V voltage output
Load ability
Current output
≤600Ω
Voltage output
Output resistance ≤250 Ω
TECHNICAL SPECIFICATION

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Line color
Explain
Power
brown
Power supply positive
black
Power supply negative
Output
yellow
Wind speed signal positive
white
Negative wind speed signal
blue
Wind direction signal positive
green
Negative wind direction signal
ANALOG OUTPUT
1. Interface description
Wide voltage power supply input 10-30V DC power supply. For 0 ~ 10V output equipment, the power supply is 24 v
2. Example of connection mode
sensor
sensor
Analog signal collector
Analog signal collector
4-wire wiring diagram
3-wire wiring diagram

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RS485 COMMUNICATION OUTPUT TYPE
1. Interface description
Wide voltage power supply input 10-30V DC power supply. When connecting 485 signal line, it is noted that the two
lines a and B cannot be connected reversely, and the address between multiple devices on the bus cannot conflict.
Line color
Explain
Power
brown
Positive power supply (10 ~ 30V DC)
black
Power supply negative (GND)
Output
yellow
485-A
blue
485-B
2. Installation and use of configuration software
2.1. Software selection
Open 485 data package, select "debugging software" - "485 parameter configuration software", find (Parameter
configuration tool.exe) and open it.
2.2. Equipment connection
2.3. Parameter setting
(1) Select the correct COM port (check the COM port in my computer - properties - Device Manager - port). The
following figure lists the driver names of several different 485 converters.
3. Computing method
3.1 conversion calculation of current mode output signal
The measuring range is 0 ~ 40m / s, 4 ~ 20mA output. When the output signal is 12mA, the current wind speed is
calculated. The span of wind speed range is 40m / s, which is expressed by 16mA current signal. 40m / S / 16mA =
2.5m/s/ma, that is, the current changes 1mA, and the wind speed changes 2.5m/s. Then the measured value can be
calculated. The measured value 12ma-4ma = 8Ma. 8Ma * 2.5m/s/ma = 20m / S, and the current wind speed = 20m / s.
3.2 calculation of voltage mode output signal conversion
The measuring range is 0 ~ 40m / s. take 0-10V output as an example, when the output signal is 5V, the current wind
speed is calculated. The span of wind speed range is 40m / s, which is expressed by 10V voltage signal. 40m / S / 10V
= 4m / S / V, that is, every 1V change of voltage corresponds to 4m / s change of wind speed. The measured value is
5v-0v = 5V. 5V*4/m/s/V=20m/s。The current wind speed is 20m / s.

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(2) After connecting a device separately, power on and click "test baud rate" of the software. The software will test the
baud rate and address of the current device. The default baud rate is 4800bit / s and the default address is 0x01.
(3) Modify the address and baud rate according to the need, and query the current function status of the device.
(4) If the test is not successful, please recheck the equipment wiring and 485 driver installation.
3.2. Data frame format definition
Modbus RTU communication protocol is adopted, and the format is as follows:
Time of initial structure ≥4 bytes
Address code = 1 byte
Function code = 1 byte
Data area = n bytes
Error check = 16 bit CRC code
Time to end structure ≥4 bytes
Address code: the address of the transmitter, which is unique in the same communication network (factory default is
0x01).
Function code: instruction function indication issued by the host.
Data area: the data area is the specific communication data, pay attention to the high byte of 16bits data before!
CRC code: two byte check code.
Host query frame structure:
Coding
8-bit binary
Data bit
8 bit
Parity bit
no
Stop bit
1 digit
Error checking
CRC (Redundant Cyclic Code)
Baud rate
It can be set by yourself, and the factory default is 4800bit / s
3. Modbus communication protocol
3.1. Basic communication parameters

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Real time wind speed calculation:
Wind speed: 007d (HEX) = 125 = > wind speed = 1.25 m / S
Real time wind direction calculation:
Wind direction: 005a (HEX) = 90 = > wind direction = east wind
For example: read the real-time wind power rating value of the transmitter equipment (address 0x01)
Question frame:
Address code
Function code
Returns the number
of valid bytes
Real time value
of wind speed
Real time value of
wind direction
CRC_L
CRC_H
0x01
0x03
0x04
0x00 0x7D
0x00 0x5A
0xEA
0x10
* Response frame:
Address code
Function code
Starting address
Data length
CRC_L
CRC_H
0x01
0x03
0x00 0x00
0x00 0x02
0xC4
0x0B
3.4. Communication protocol example and explanation
For example: read the real-time value of wind speed and direction of transmitter equipment (address 0x01)
Question frame:
Register
address
PLC or
configuration
address
Content
Operation
Definition
0000 H
40001 (decimal)
Instantaneous wind
speed
Read-only
Real time value of wind speed
(expanded by 100 times)
0001 H
40002 (decimal)
wind direction
Read-only
Real time value of wind direction
(integer, 0 ° due north, 90 ° due east)
0002 H
40003 (decimal)
Maximum wind speed
Read-only
Maximum wind speed after power on
of equipment (expanded by 100 times)
0003H
40004 (decimal)
Wind power rating
Read-only
Wind level corresponding to the
current wind speed (integer, 0-17)
07D0 H
42001 (decimal)
Device address
Read-write
1 ~ 254 (factory default 1)
07D1 H
42002 (decimal)
Baud rate of
equipment
Read-write
0 for 2400
1 stands for 4800
2 for 9600
3.3.Register address
Address
code
Function
code
Valid bytes
1st Data
area
2nd Data
area
Data
N area
CRC_L
CRC_H
1byte
1byte
1byte
2byte
2byte
2byte
1byte
1byte
Slave response frame structure:
Address code
Function code
Register start address
Register length
CRC_L
CRC_H
1byte
1byte
2byte
2byte
1byte
1byte

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Real time wind rating calculation:
Wind power rating: 0001 (hexadecimal) = 1 = > wind power rating = 1
COMMON PROBLEMS AND SOLUTIONS
Device cannot be connected to PLC or computer
Possible reasons:
1) The computer has multiple COM ports. The selected port is incorrect.
2) The device address is wrong, or there are devices with duplicate addresses (factory default is all 0x01).
3) Baud rate, check mode, data bit, stop bit error.
4) 485 bus is disconnected, or a and B lines are connected reversely.
5) If the number of equipment is too much or the wiring is too long, it is necessary to supply power nearby, add 485
intensifier, and increase 120 Ωterminal resistance at the same time.
6) USB to 485 driver is not installed or damaged.
7) The equipment is damaged.
Fault phenomenon: no output or output error
Possible reasons:
(1) The range corresponding error leads to PLC calculation error. Please refer to the technical indicators in the first part
for the range.
(2) Wrong wiring mode or wrong wiring sequence.
(3) The power supply voltage is wrong (for 0-10V type, it is 24 V power supply).
(4) The distance between transmitter and collector is too long, resulting in signal disorder.
(5) PLC acquisition port is damaged.
(6) The equipment is damaged.
Address code
Function code
Number of valid bytes
wind power
CRC_L
CRC_H
0x01
0x03
0x02
0x00 0x01
0x79
0x84
* Response frame:
Address code
Function code
Starting address
Data length
CRC_L
CRC_H
0x01
0x03
0x00 0x03
0x00 0x01
0x74
0x0A