FuehlerSysteme FS6002 User manual

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Weather Station
FS6002
Instructions for Use

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Safety Instructions
•Before operating with or at the device/product, read through the operating instructions.
This manual contains instructions which should be followed on mounting, start-up, and operation.
A non-observance might cause:
- failure of important functions
- endangering of persons by electrical or mechanical effect
- damages to objects
•Mounting, electrical connection and wiring of the device/product must be carried out only by a qualified
technician who is familiar with and observes the engineering regulations, provisions and standards applicable in
each case.
•Repairs and maintenance may only be carried out by trained staff or the manufacturer.
Only components and spare parts supplied and/or recommended by the manufacturer should be used for
repairs.
•Electrical devices/products must be mounted and wired in zero potential state only.
•The manufacturer guarantees proper functioning of the device/products provided that no modifications have
been made to the mechanics, electronics or software, and that the following points are observed:
•All information, warnings and instructions for use included in these operating instructions must be taken into
account and observed as this is essential to ensure trouble-free operation and a safe condition of the measuring
system / device / product.
•The device / product is designed for a specific application as described in these operating instructions.
•The device / product should be operated with the accessories and consumables supplied and/or recommended
by the manufacturer.
•Recommendation: As it is possible that each measuring system / device / product under certain conditions, and
in rare cases, may also output erroneous measuring values, it is recommended to use redundant systems with
plausibility checks with security-relevant applications.
Environment
•Products governed by the provisions of "ElektroG" (German Electrical and Electronic
Equipment Act) will be taken back and will be recycled or environmentally compatible
disposed. We are prepared to take back all products concerned free of charge if returned to us
by our customers carriage-paid.
•Make sure you retain packaging for storage or transport of products. Should packaging
however no longer be required, arrange for recycling as the packaging materials are designed
to be recycled.
Documentation
•© Copyright FuehlerSysteme eNET International GmbH, Nuremberg / Germany
•Although this operating instruction has been drawn up with due care, FuehlerSysteme eNET International
GmbH can accept no liability whatsoever for any technical and typographical errors or omissions in this
document that might remain.
•We can accept no liability whatsoever for any losses arising from the information contained in this document.
•Subject to modification in terms of content.
•The device / product should not be passed on without the/these operating instructions.

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Contents
1Model.............................................................................................................................6
2Application.....................................................................................................................6
3Mode of operation..........................................................................................................9
3.1 Wind measurement:............................................................................................................9
3.1.1 Measuring principle: Wind speed and direction ............................................................9
3.1.2 Measuring principle: Acoustic virtual temperature ......................................................10
3.2 Temperature and humidity measurement: ........................................................................11
3.3 Air pressure:.....................................................................................................................11
3.4 Brightness: .......................................................................................................................11
3.5 Precipitation:.....................................................................................................................11
3.5.1 Measuring principle: Precipitation:..............................................................................11
3.5.2 Type of precipitation (Synop Code):...........................................................................12
4Storage and handling of the WEATHER STATION .....................................................13
5Installation of WEATHER STATION............................................................................13
5.1 Selection of installation site...............................................................................................13
5.2 Mechanical installation......................................................................................................14
5.2.1 Alignment to north......................................................................................................14
5.3 Electrical installation.........................................................................................................15
5.3.1 Cable, cable preparation, connector installation.........................................................15
5.3.2 Connection diagram for 16-core cable (function example)..........................................17
5.3.3 Connection with optional 16-core cable 509311.........................................................17
5.3.4 Connection diagram for 8-core cable (function example)............................................18
5.3.5 Connection with optional 8-core cable 509427...........................................................18
6Servicing......................................................................................................................19
6.1 Calibration........................................................................................................................19
6.2 Warranty...........................................................................................................................20
7Functional description..................................................................................................20
7.1 Command interpreter MODBUS RTU...............................................................................20
7.1.1 Measured values (input register)................................................................................21
7.1.2 Commands (holding register).....................................................................................28
7.1.3 Commands and descriptions......................................................................................28
7.1.4 Sensor Status.............................................................................................................29
7.2 Analogue outputs..............................................................................................................29
7.2.1 North correction..........................................................................................................30
7.3 Instantaneous values and output of raw measured values................................................31
7.3.1 Averaging...................................................................................................................31
7.4 Serial data output .............................................................................................................32
7.4.1 Data request ..............................................................................................................32
7.4.2 Autonomous telegram output .....................................................................................32
7.4.3 Fixed telegram formats...............................................................................................33
7.4.4 Generation of check sum ...........................................................................................33
7.5 Device behaviour under extreme measuring conditions....................................................34

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7.5.1 Occurrence of errors:.................................................................................................34
7.5.2 Behaviour of analogue outputs...................................................................................34
7.5.3 Behaviour of telegram output.....................................................................................34
7.6 Output of all system parameters.......................................................................................34
7.7 Query software version.....................................................................................................34
7.8 Force restart.....................................................................................................................34
7.9 Plausibility ........................................................................................................................35
7.10 Online Help ......................................................................................................................35
8Configuration of WEATHER STATION by customer....................................................36
9List of commands.........................................................................................................37
10 Commands and descriptions .......................................................................................38
11 Appendix 1 Predefined data telegrams........................................................................57
11.1 Telegram 1 VDT...............................................................................................................57
11.2 Telegram 2 VDTHP..........................................................................................................57
11.3 Telegram 3 VDTBDRE .....................................................................................................58
11.4 Telegram 4 VDTHPBDRE ................................................................................................58
11.5 Telegram 5 NMEA - WIND ...............................................................................................59
11.6 Telegram 6.......................................................................................................................60
11.7 Telegram 7.......................................................................................................................62
11.8 Telegram 14 Scientific telegram .......................................................................................63
11.9 Telegram Addition by Parameter OP................................................................................65
12 Technical data .............................................................................................................66
13 Accessories (available as optional features)................................................................68
14 Dimension drawing......................................................................................................69

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Table
Table 1: Synop Code table............................................................................................................ 12
Table 2: Restrictions in full and half duplex mode.......................Fehler! Textmarke nicht definiert.
Table 3: Access keys for different command levels ....................Fehler! Textmarke nicht definiert.
Table 4 : MODBUS frame.............................................................................................................. 20
Table 5: MODBUS exceptions....................................................................................................... 20
Table 6: MODBUS input register ................................................................................................... 27
Table 7: List of commands............................................................................................................. 28
Table 8: Factory-set Scaling of analogue outputs.......................................................................... 30
Table 9: List of predefined data telegrams..................................................................................... 33
Table 10: Selection of averaging periods with parameter AV......................................................... 41
Table 11: List of baud rates with telegram BR ............................................................................... 42
Table 12: Conversion factors between different wind speeds........................................................ 51

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1 Model
Article No.
Designation
Parameters
Output / Interfaces / Features
WS2/O-U/MB
WEATHER STATION
As above
- As above, however
Data protocol, adjusted:
- BINARY (Modbus RTU)
in half duplex mode
2 Application
The WEATHER STATION is used for acquisition of the most important meteorological parameters.
Depending on the development level the device supplies measured data for:
•Wind speed and direction, averaging acc. to WMO- recommendations.
•Air temperature.
•Relative humidity.
•Barometric air pressure.
•Precipitation.
•Brightness.

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For a correct determination of the wind direction in mobile use of the WEATHER STATION there is
a magnetic compass integrated in all models available. Furthermore, an integrated GPS-receiver
serves for the determination of the exact Universal Time, and geographic position.
For an exact north alignment at stationary installation it is used the difference angle between the
brightness direction –measured by the instrument at cloudless sky –and the sun position angle
–calculated via Universal Time and geographic position of the GPS.
In addition to the meteorological sensors there is integrated a GPS-receiver, an electronic magnetic
compass, and an acceleration sensor in the instrument.
The options for data output are
- analogue, as a standard signal or / and in
- binary (MODBUS RTU protocol).
The compact design, simple mounting and different options for data output permit operation with
numerous applications.
The device is particularly suitable for use in the following sectors:
- Building services management.
- Traffic control.
- Meteorology.
- Industry.
- Energy Supply.
- Environmental monitoring.
The wind speed and wind direction are determined through the acquisition of 2-dimensional
horizontal components of ultrasonic measurement paths positioned at right angles in relation to
each other. The speed of sound can be additionally used to calculate and output the acoustic
virtual temperature.
The principle of measuring the ultrasonic propagation time means that the device is ideal for the
inertia-free measurement of gusts and peak values.
The air temperature and relative humidity are measured via a built-in precision combination
sensor. It is protected from harmful environmental influences by a micropore filter that is
impermeable to water but open to water vapour. The built-in pressure sensor based on MEMs
(micro-electro-mechanical system) technology is also protected with such a filter.
Measurement of the precipitation intensity is contactless using a signal reflected back with a
Doppler radar. When calculating this, the intensity captured for the last minute is extrapolated to an
output for one hour.

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Brightness is captured by 4 photo sensors with spectral sensitivity curve, which is ideally suited to
the sensitivity of the human eye. The direction of the light source is calculated using the prevailing
intensity conditions. The logarithmic intensity characteristic of the photo sensors allows light
intensities to be measured and output in a wide range between 1 –150,000lux.
The real direction of the maximum brightness ca be calculated via the 4 photo sensors, and can be
output as brightness direction. With unclouded sky this direction corresponds to the azimuth angle
of the sun position.
With diffuse light conditions it might deviate from the real azimuth angle of the sun position.
Therefore, a threshold of 10kLux has been determined. Below this threshold the brightness
direction is output with 0°.
In weather situations with quickly travelling clouds the direction of the measured maximum
brightness can steadily change, which might result in an irregular control of connected clouding
devices. Here, it makes more sense to use the azimuth angle of the sun position, which is
calculated via GPS information, for external control.
Remark:
The components of the single brightness sensors can be measured correctly only when the
WEATHER STATION is aligned mechanically to the north direction. The electronic north correction
affects only the vectorial brightness direction (see command BO).
A GPS receiver, which is built-in with certain models, is used for the determination of position and
as a real-time source. This data is additionally used to calculate the current position of the sun. The
position, time and position of the sun are output via the e RS485/422 interfaces.
An electronic compass which is integrated, detects the horizontal aspecular angle of the north
marking of the instrument to the magnetic north pole in angular degrees.
The analogue and digital interfaces are electrically isolated from the power supply and the housing
potential. This means that there is no conductive connection that might result in the output signals
being superposed by interference currents or voltages.
Digital output:
A RS485/422 interface is available for serial communication. It can be operated in full or half duplex
mode. Predefined data telegrams are available for outputting measured values (e.g. VD, VDT,
NMEA, etc.).
A MODBUS RTU protocol is additionally implemented for extended standardised communication.
The device can be switched to MODBUS-RTU mode with the relevant command.
Analogue outputs:
8 voltage outputs 0..10V are available.
The first 3 outputs are set to:
1. Wind speed.
2. Wind direction.
3. Temperature.
The other 5 voltage outputs are predefined for:
4. Relative humidity,
5. air pressure,
6. brightness,
7. brightness direction,
8. precipitation intensity.

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Individual output scaling of the measuring ranges is possible; see Command OL, Output Link.
These outputs are either active or inactive depending on the model.
Serial and analogue output of the data can take the form of an instantaneous value or a sliding
mean.
Device models without GPS nevertheless have a battery-backed real-time clock, which can be
used to output a date and time stamp in the data telegrams.
The WEATHER STATION is equipped with a built-in heating system, so more or less stopping ice
or snow from building up on the device.
3 Mode of operation
3.1 Wind measurement:
The wind speed measuring module of the WEATHER STATION consists of 4 ultrasonic converters,
arranged in pairs of two facing each other via a reflector. The two resulting measurement paths are
at right angles to each other. The converters function both as acoustic transmitters and acoustic
receivers.
The electronic control system is used to select the respective measurement path and its measuring
direction. When measurement starts, a sequence of 4 individual measurements is performed in all
4 directions of the measurement paths in a basic measuring cycle of one millisecond.
The measuring directions (sound propagation directions) rotate clockwise. Mean values are
calculated from the 4 individual measurements of the path directions and then used for further
calculations. The time required for a measuring sequence at the maximum measuring speed is
exactly 10.0 milliseconds (measuring sequence 8ms + 2ms for analysis).
3.1.1 Measuring principle: Wind speed and direction
The propagation speed of sound in calm air is superposed by the speed components of an airflow
in the direction of the wind. A wind speed component in the propagation direction of the sound
supports its speed of propagation, so causing it to increase. On the other hand, a wind speed
component against the propagation direction reduces the speed of propagation. The propagation
speed resulting from superposition results in different propagation times of the sound at different
wind speeds and directions over a fixed measurement path.
As the speed of sound greatly depends on the temperature of the air, the sound propagation time is
measured on each of the two measurement paths in both directions. These rules out the
measurement result being influenced by temperature.
By combining two measuring paths at right angles to each other, the sum and angle of the wind
speed vector are obtained in the form of rectangular components. After the rectangular speed
components have been measured, they are converted to polar coordinates by the WEATHER
STATION microprocessor and then output as a sum and angle of wind speed.

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Moving averaging of the wind velocity and wind direction acc. to the WMO- recommendations:
The wind data can be averaged moving over a time span of up to 10 minutes on a base of
100 millisecond values. This averaging is calculated according the recommendation of the WMO as
the FIFO-method. That means, that all data are kept in the memory up to the end of the averaging
period. Thus, a data outlier can be identified as such, and - contrary to a first-order averaging –
does not lead to a settling of its influence for a longer period.
3.1.2 Measuring principle: Acoustic virtual temperature
The thermodynamic interrelationship between the propagation speed of sound and the absolute air
temperature is defined by a root function. The speed of sound is also more or less independent of
the air pressure and only depends on the absolute air humidity to an insignificant extent.
This physical relationship between the speed of sound and temperature can be used to measure
the temperature of the air as long as its chemical composition is known and remains constant. The
levels of gases in the atmosphere are constant and, with the exception of the content of water
vapour, vary by no more than a few 100ppm (CO2) even over lengthy periods.
The determination of gas temperature via its speed of sound is performed directly from
measurement of its physical properties without the indirect step of thermal coupling of this gas to a
sensor, which would otherwise be necessary.
Note:
The acoustic-virtual temperature is the air temperature which refers to dry air
without any water vapour. It is detected by sonic logging of acoustic pulses .
The acoustic temperature is not suitable for the exact measurement of air
temperature. It serves exclusively for the verification of the acquired wind
measuring values.

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3.2 Temperature and humidity measurement:
A built-in hygro-thermo sensor with an I2C interface is used to measure temperature and humidity
levels. The sensor's power consumption is so low that even when actively performing
measurement, the increase in temperature through heat loss can hardly be measured.
The hygro-thermo sensor is protected from the ingress of water by a miniature housing with a
vapour-permeable membrane. The very small air exchange volume means that the sensor
responds to changes in air humidity in a matter of seconds.
The sensor is mounted on a plug-in board equipped with weather and radiation protection and
therefore supplies accurate values for air temperature and humidity even when exposed to solar
irradiation.
3.3 Air pressure:
Air pressure is measured with a MEMs sensor, based on piezoresistive technology, and output via
an I2C interface.
The sensor is mounted on the same plug-in board as the hygro-thermo sensor. The air pressure
sensor is likewise protected from the ingress of water by a protective element equipped with a
vapour-permeable membrane.
3.4 Brightness:
Brightness is measured using 4 individual photo sensors facing the 4 points of the compass at an
elevation angle of 50°. They are soldered onto a printed board in the cover of the device as SMD
components.
The elevation angle of 40° corresponds to the mean vertical position of the sun (equinox) in our
latitudes.
For meaningful mapping of the intensity dynamic for brightness with 5 orders of magnitude the
photo sensors output a current, which is logarithmically dependent on the brightness level.
The current reading is converted to a digital measured value by an A/D converter. After further
processing as a digital value by the CPU, it is then output in the telegram or as an analogue linear
value in a pre-selectable range of measured values.
3.5 Precipitation:
A Doppler radar module is used to detect precipitation and determine its intensity. This radar
module operates with radiated RF power of a few milliwatts at a frequency, which has international
clearance for this purpose.
Like the brightness sensors, the radar module is mounted on top of the printed board in the device
cover and is protected from environmental influences by an optically and electromagnetically
transparent cover.
The sending and receiving aerial points vertically upwards, towards precipitation from above.
3.5.1 Measuring principle: Precipitation:
The Doppler radar beams a very small (mW range) electromagnetic signal via an array of sending
aerials. A receiving aerial array receives both the transmitted signal and the signal reflected by tiny
particles or droplets.
Where there is a difference in frequency between the send and receive signal, combining the
transmitted signal with the reflected signal will generate the difference frequency of the two signals.
This difference frequency is an accurate measure for the relative speed at which the particle is

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moving towards or away from the Doppler radar module.
The speed at which rain drops fall is roughly proportional to the square root of the drop diameter
(Gunn and Kinzer 1949).
The precise relationship between the speed at which rain falls and the diameter / volume of the rain
drops can be used to calculate individual volumes and thus the rainfall intensity based on the
frequency rate and the frequency of the Doppler frequencies.
3.5.2 Type of precipitation (Synop Code):
Attention: The full synoptic resolution, especially at the transition from rain to snow and
vice-versa, can only be reached in the fully extended version with integrated thermo-hygro-
sensor.
The type of precipitation can be roughly determined from the measured values of rainfall speed,
intensity, temperature and humidity.
The following table shows the codes for the identifiable types of precipitation based on the Synop
Table 4680, VuB Vol. D Supplement 6 applicable to automatic stations:
Synop Code wawa
Meaning
0
No precipitation.
40
Precipitation present.
51
Light drizzle.
52
Moderate drizzle.
53
Heavy drizzle.
61
Light rain.
62
Moderate rain.
63
Heavy rain.
67
Light rain and/or drizzle with snow.
68
Moderate rain and/or drizzle with snow.
70
Snowfall.
71
Light snow.
72
Moderate snow.
73
Heavy snow.
74
Ice crystals.
89
Heavy hail.
Table 1: Synop Code table
Attention:
The synoptic key serves only for differentiating the
precipitation types. In addition, the intensity must be
considered for control purposes in order to avoid unnecessary
operation of e.g. shading equipment.

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4 Storage and handling of the WEATHER STATION
Recommendation:
The Weather station should be stored in the original packing dry (relative humidity <60%), and a
moderate temperatures (5°C…25°C).
Remark: The storing temperature must not fall below or exceed the range of -55°C…80°C.
Special requirements by the electronic magnetic field compass:
Please take care that the instrument is not exposed to strong static magnetic fields > 1m Tesla
with storing, handling, and of course also in operation, as else the calibration of the magnetic
compass might be changed permanently.
Otherwise, a demagnetization with subsequent re-calibration might be necessary.
5 Installation of WEATHER STATION
Caution:
The working position of the WEATHER STATION is vertical
(plug connection at bottom).
During installation, dismantling, transport or servicing of the
WEATHER STATION, it must be ensured that no water gets into
the base of the device or plug connector.
The instrument must be mounted and wired only by qualified
personnel, who knows and observes the generalities of
techniques, and applicable regulations and norms.
5.1 Selection of installation site
An exposed position should be selected as the installation site. The measurement properties
should not be influenced by light reflections, cast shadows or the device being positioned in the lee
of the wind.
Above and below the WEATHER STATION there should be no larger moving objects (such as
trees or driving cars) up to a radius of 10 meters within the visual range of the Doppler radar. This
applies especially for moving objects in sensor height, as well as for gas discharge lamps, eg Street
lighting.
The radar signals reflected by these objects might generate Doppler frequencies, which might be
interpreted as precipitation events.
Over-voltage and lightning protection as well as any required proper ground connection according
to local regulations should be considered by others.

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5.2 Mechanical installation
Proper installation of the WEATHER STATION is carried
out using a tube socket R1½" (Ø 48.3mm) and at least
30mm in length. The inside diameter of the tube socket
must be at least 30mm as the electrical connection of the
WEATHER STATION is carried out at the bottom of the
device. After connection the WEATHER STATION is then
mounted on the tube or mast socket. The marking for
north on the device must be aligned to north (see section
4.2.1). The device is fixed to the shaft with the two Allen
screws (AF 4mm).
Caution:
The allen screws must be
tightened to 2Nm
5.2.1 Alignment to north
For exact determination of the wind and Brightness
direction the WEATHER STATION must be installed
aligned to north (true north).
When aligning the device, the marking for north (N)
must point to north (true north). To do so, select a
conspicuous feature of the landscape to the north or
south with a compass and turn the mast or sensor until
the marking for north points to true north.
When aligning the device to north using a compass, bear
in mind the magnetic variation (= deviation in the
direction of the compass needle from true north) and
possible interference from magnetic fields (e.g. iron
parts, electric cables).
The lower edge of the sensor base is equipped with a
bore for north aligned to the marking for north. This
bore allows a mast adapter with a pin for north to be
used here. The mast adapter is not included in the scope
of supply.

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5.3 Electrical installation
The WEATHER STATION is equipped with a 19-pin plug for electrical connection. A socket outlet
(mating connector) is included in the scope of supply.
5.3.1 Cable, cable preparation, connector installation
The connecting cable should have the following properties depending on the model of the device:
16 cores, core cross-section for supply and data communications 0,25mm², cable diameter max.
8.0mm, resistant to ultraviolet rays, overall shielding.
Note:
A prepared connecting cable is available for the WEATHER STATION as an
optional accessory (see accessories).
Attention:
A short-circuit at the analogue output may lead to malfunction
of the serial communication, falsification of measuring values,
and in the long term, may damage the instrument!
Outputs which are not used, should be applied to unused
terminals, in order to avoid a short-circuit among each other,
with the housing/analogue ground, or with other lines.

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Socket outlet 212812, 19-pin, (Binder, Series 440), EMC
1. Strip over L = 33mm.
Do not remove sheath.
2. Slip on pressing screw and clamping device.
Remove sheath.
3. Strip wire strands and tin-coat.
4. Fan / comb out shielding. Thread shield wires
into crown all round.
5. Engage distance sleeve and clamping
device.
6. Slide assembled unit backwards over cable
(approx. 10mm).
7. Solder inserts in place.
8. Slide assembled unit forwards until it engages
in the contact insert.
9. Draw shield wires towards shielding ring and
shorten.
Too long: wires on packing ring –no seal.
Too short: no contact with shaft ring.
10. Insert assembled unit in carrier sleeve.

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5.3.2 Connection diagram for 16-core cable (function example)
Note:
- See the supplementary sheet "Werkseinstellung" with the factory settings for
precise function assignment.
- The pins A,B,C,H,I,K,L,M,N,O,P,R,S,T,U are electrically isolated from the
supply voltage.
Electrical connection
View of solder terminal
PIN
Colour coding**
Assignment
Function
of socket outlet
T
PINK
Analogue 0..10V
Wind speed (m/s).
S
VIOLET
Analogue 0..10V
Wind direction (°).
O
RED-BLUE
Analogue 0..10V
Air temperature (°C).
N
GREY-PINK
Analogue 0..10V
Relative humidity (%).
C
BROWN-GREEN
Analogue 0..10V
Air pressure (hPA).
B
WHITE-YELLOW
Analogue 0..10V
Brightness (lux).
A
WHITE-GREEN
Analogue 0..10V
Brightness direction (°).
P
YELLOW-BROWN
Analogue 0..10V
Precipitation intensity.
H
BLUE
GND isolated
Analogue earth.
I
GREY
GND isolated
Analogue earth.
L
YELLOW
TXD+, RXD+ (HD)
Serial interface (RS485).
K
GREEN
TXD-, RXD- (HD)
Serial interface (RS485).
U
BROWN
RXD+ (full duplex)
Serial interface (RS485).
M
WHITE
RXD- (full duplex)
Serial interface (RS485).
R
not assigned
(-)24V feedback
(-) Power supply*.
E
RED
(+)24V AC/DC
nom.
(+) Power supply*.
F
not assigned
(+)24V AC/DC
nom.
(+) Power supply*.
D
BLACK
(-)24V AC/DC nom.
(-) Power supply*.
G
not assigned
(-)24V AC/DC nom.
(-) Power supply*.
SH
GREEN/YELLOW
CABLE SHIELD
Shielding from electric fields.
* Reverse voltage protection.
** The above colour coding scheme only applies to cables of the type SABIX D315 FRNC
16 x 0.25.
5.3.3 Connection with optional 16-core cable 509311
The optional 509311 cable is a ready prepared 16-core cable, which has a plug connector on the
transmitter side, and open, colour-coded wire ends on the user side.
See section 5.3.2 for cable assignment.

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5.3.4 Connection diagram for 8-core cable (function example)
Electrical connection
View of solder terminal
PIN
Colour coding
Assignment
Function
of socket outlet
T
−
−
−
S
−
−
−
O
−
−
−
N
−
−
−
C
−
−
−
B
−
−
−
A
−
−
−
P
−
−
−
H
−
−
−
I
GREY
GND isolated
Interface GND.
L
YELLOW
TXD+, RXD+ (HD)
Serial interface (RS485).
K
GREEN
TXD-, RXD- (HD)
Serial interface (RS485).
U
BROWN
RXD+ (full duplex)
Serial interface (RS485).
M
WHITE
RXD- (full duplex)
Serial interface (RS485).
R
−
−
−
E
RED
(+)24V AC/DC nom.
(+) Power supply*.
F
−
−
−
D
BLUE
(-)24V AC/DC nom.
(-) Power supply*.
G
−
−
−
SCH
GREEN/YELLOW
CABLE SHIELD
Shielding from electric fields.
* Reverse voltage protection.
5.3.5 Connection with optional 8-core cable 509427
The optional 509427 cable is a ready prepared 8-core cable, which has a plug connector on the
transmitter side, and open, colour-coded wire ends on the user side.
See section 5.3.4 for cable assignment.

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6 Servicing
As the device does not have moving parts, i.e. is not subjected to wear during operation, only
minimal servicing is required.
The device may become soiled depending on its installation site. Cleaning should be carried out
using water, non-aggressive cleaning agents and a soft cloth.
The surface of the instrument cover is roughened for measurement technique reasons, and must
not be polished, by no means. The cover is to be cleaned with soft cloth and brushes only, without
polishing effect, and by a fat-dissolving cleaning agent (dish liquid, no aggressive solvents such as
Acetone).
Caution:
During storage, installation, dismantling, transport or servicing
of the WEATHER STATION, it must be ensured that no water
gets into the device or plug connector.
The cover surface should not be touched with palms or fingers,
in order to avoid a contamination through skin-fat
6.1 Calibration
The WEATHER STATION does not contain any adjustable components such as mechanical or
electrical trimming elements. All components and materials are invariant over time. There is thus no
need for regular calibration due to ageing. Only major mechanical deformation of the device and a
resulting change in the measurement path length of the ultrasonic converters can cause errors in
measured values.
The acoustic virtual temperature can be used to check the effective length of the acoustic
measurement path. A change of approx. 1% in the measurement path length and thus a measuring
error of approx. 1% of the wind speed corresponds to a deviation of the acoustic temperature of
approx. 6K at 20°C. A deviation in the acoustic temperature of 2 Kelvin from the real acoustic air
temperature could lead to a measuring error of the wind speed of approx. 0,34%.
Due to the construction of the instrument a significant change in the measurement path length
without mechanical damage of the housing can be excluded.
Important:
Mechanical damage involving deformation of the device may
lead to errors in measured values.

20 - 70 71130/11E/0318
6.2 Warranty
Damage caused by improper handling or external influences, e.g. strike by lightning, are not
covered by the warranty provisions. The warranty is void if the device is opened.
Important:
The WEATHER STATION must be returned in the original
packaging.
7 Functional description
The functions of the WEATHER STATION are described below.
7.1 Command interpreter MODBUS RTU
If the command interpreter MODBUS RTU has been selected, the transmitted bytes will be
interpreted according to the MODBUS specification (http://www.modbus.org/). The Weather station
acts as a MODBUS slave here.
Data is transmitted in packets, so-called frames, max. 256 bytes in length.
Every packet includes a 16-bit CRC check sum (initial value: 0xffff).
Slave address
Function code
Data
CRC
1 byte
1 byte
0...252 byte(s)
2 bytes
CRC low-byte
CRC high-byte
Table 2 : MODBUS frame
The following MODBUS functions are supported:
- 0x04 (read input register).
- 0x03 (read holding registers).
- 0x06 (write single register).
- 0x10 (write multiple registers).
The sensor supports write access for the slave address 0 ("Broadcast").
All MODBUS requests received are checked for validity before execution. With any error the
weather station responds with one of the following exceptions (MODBUS Exception Responses).
Code
Name
Meaning
0x01
ILLEGAL FUNCTION
The function code in the request is not permissible for the
register address.
0x02
ILLEGAL DATA ADDRESS
The register address in the request is invalid.
0x03
ILLEGAL DATA VALUE
The data given in the request are not allowed, or the
parameter is write-protected.
Table 3: MODBUS exceptions