elsner elektronik P03/3-RS485 Instruction manual

Weather Station
P03/3-RS485
with RS485 Interface
Technical data
and notes for installation
Elsner Elektronik GmbH Control and Automation Engineering
Herdweg 7 • D-75391 Gechingen • Germany
Phone: [phone] • Fax: [phone]
[email protected] • www.elsner-elektronik.de

Weather Station P03/3-RS485 • Version: 11.10.2011 • Subject to technical alterations. Errors excepted.
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Description
The P03/3-RS485 Weather Station measures temperature, wind speed and brightness
(eastern, sothern and western sun). It recognizes precipitation and receives the DCF77
radio signal for date and time.
The weather station sends the currently recorded weather data, date and time once
every second. This data flow can be received and analyzed by an end device such as
SPS, PC or MC. If the DCF signal cannot be received, the data is output approx. every
1.35 seconds.
The P03/3-RS485 has four connections. Data output is at terminals A and B. Terminals 1
and 2 are for the power supply (24 V DC). The connections are not resistant to pole
reversal. Connecting them incorrectly will destroy the interface components.
Functions:
•Brightness measurement with three separate sensors for east, south and west.
Recognition of twilight/dawn with special filters
•Wind speed measurement by means of a nonwearing electronic sensor. No
damage from storm or hail as with mechanical anemometers
•Temperature measurement
•Heated precipitation sensor (1.2 watts): No false reports as a result of fog or
dew. Dries quickly after precipitation has stopped
•Integrated DCF77 radio clock receiver
Technical data
Housing: Plastic material
Colour: White / translucent
Mounting: On-wall
Protection category: IP 44
Dimensions: approx. 96 x 77 x 118 (W x H x D, mm)
Weight: approx. 160 g
Ambient temperature: Operation -30…+50°C, Storage -30…+70°C
Operating voltage: 24 V DC
Current: max. 125 mA, residual ripple 10%
If switching power supply units are applied, the quality of the radio clock reception may
be influenced.
Data output: RS485
Heating rain sensor: approx. 1.2 W

Weather Station P03/3-RS485 • Version: 11.10.2011 • Subject to technical alterations. Errors excepted. 3
Measurement range temperature: -40…+80°C
Resolution: 0.1°C
Accuracy:
±1.5°C at -25…+80°C
Measurement range wind: 0…70 m/s
Resolution: <10% of the measured value
Accuracy: ± 25% at 0…15 m/s,
at an angle of attack of 45°, pole mounting
Measurement range brightness: 0…99 000 lux
Resolution:
1 lux at 0…120 lux
2 lux at 121…1 046 lux
63 lux at 1 047…52 363 lux
423 lux at 52 364…99 000 lux
Accuracy: ± 35%
The following standards were referenced with regard to evaluating electromagnetic
compatibility of the product:
EN 60730-1:2000-11 + A11:2002
The product has been tested by an accredited EMC laboratory according to the
abovementioned standards.

Weather Station P03/3-RS485 • Version: 11.10.2011 • Subject to technical alterations. Errors excepted.
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PCB layout
Fig. 1
1 Socket for connecting cables to rain sensor in housing cover
2 Socket for connection
1: +24 V DC
2: GND
A: Data
B: Data
3 DCF77 reception control LED
4 DCF77 antenna set screw

Weather Station P03/3-RS485 • Version: 11.10.2011 • Subject to technical alterations. Errors excepted. 5
Transfer protocol
All characters and/or digits are based on the ASCII standard, i.e. every reading
processed internally as an integer or float value will always be broken down into and
transferred in its individual ASCII format characters. They must then be reassembled in
the reverse process by the receiver.
Transfer rate: 19200 Baud
Data bits: 8
Stop bit: 1
Parity: none
The checksum is calculated along by the receiver by adding all received bytes up until
byte 35 and then compared with the checksum transferred from the P03.
Units: Temperatures in degrees Celsius
Sun intensity in kilolux
Daylight in Lux
Wind in metres per second
The DCF signal can be easily interfered with. It is possible for no radio clock reception to
exist for extended periods. Therefore, only use the output time for synchronization of
another clock working in parallel in the system. For this, the second 0 should be used.
Byte
No.
Char Meaning
1 W Weather data start
2 OT: Sign Outdoor temperature sign • / +
3 OT: 1st digit Outdoor temperature 1st digit (tens)
in °C
4 OT: 2nd digit Outdoor temperature 2nd digit (ones)
5 OT: Point Outdoor temperature point
6 OT: 3rd digit Outdoor temperature 3rd digit (tenth)
7 SuS: 1st digit Sun South 1st digit (tens)
1-99 klx
8 SuS: 2nd digit Sun South 2nd digit (ones)
9 SuW: 1st digit Sun West 1st digit (tens)
10 SuW: 2nd digit Sun West 2nd digit (ones)
11 SuE: 1st digit Sun East 1st digit (tens)
12 SuE: 2nd digit Sun East 2nd digit (ones)
13 Twilight Twilight: J = Yes; N = No < 10 lx
14 Daylight 0-999Lx Daylight (1st digit hundreds)
0-999 lx
15 Daylight 0-999Lx Daylight (2nd digit tens)
16 Daylight 0-999Lx Daylight (3rd digit ones)
17 Wind: 1st digit Wind 1st digit (tens)
in m/s
18 Wind: 2nd digit Wind 2nd digit (ones)
19 Wind: Point Wind Point
20 Wind: 3rd digit Wind 3rd digit (tenth)

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Byte
No.
Char Meaning
21 Rain Rain: J = Yes; N = No
22 Weekday: 1-7 Weekday: 1 = Mo, 7 = Su
23 Date: Day 1st digit Date: Day 1st digit (tens)
24 Date: Day 2nd digit Date: Day 2nd digit (ones)
25 Date: Month 1st digit Date: Month 1st digit (tens)
26 Date: Month 2nd digit Date: Month 2nd digit (ones)
27 Date: Year 1st digit Date: Year 1st digit (tens)
28 Date: Year 2nd digit Date: Year 2nd digit (ones)
29 Time: Hrs. 1st digit Time: Hrs. 1st digit (tens)
30 Time: Hrs. 2nd digit Time: Hrs. 2nd digit (ones)
31 Time: Min. 1st digit Time: Min. 1st digit (tens)
32 Time: Min. 2nd digit Time: Min. 2nd digit (ones)
33 Time: Sec. 1st digit Time: Sec. 1st digit (tens)
34 Time: Sec. 2nd digit Time: Sec. 2nd digit (ones)
35 Summertime J = Summertime N = Wintertime
? = Not defined
36 Checksum: 1st digit Checksum 1st digit (thousands)
37 Checksum: 2nd digit Checksum 2nd digit (hundreds)
38 Checksum: 3rd digit Checksum 3rd digit (tens)
39 Checksum: 4th digit Checksum 4th digit (ones)
40 End End 0x03
Installation and first use
The weather station may only be installed, tested, put into
operation and troubleshot by a person qualified to do so.
When connecting the weather station, do not connect any live wires (switch off the
mains fuse first) and take precautionary measures to prevent them from being
accidentally switched back on. Make sure all connections are correct. An incorrect
connection could destroy the weather station or any electronic devices connected to it.
The weather station must be used for its intended purpose only. Any improper
modification or failure to observe the operation instructions will void all guarantees or
claims to warranty.
When unpacking, check the unit immediately for any mechanical damage. The supplier
must be informed immediately of any damage caused during transport.
The weather station must not be put into use if
damaged.

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If there is any cause to believe that safe operation is no longer guaranteed, the system
must be rendered inoperative and secured against being switched on unintentionally.
The weather station may only be operated as a stationary installation; i.e. only when
mounted and after all installation and initialization procedures are complete, and only in
the environment it is intended for.
Elsner Elektronik is not liable for any changes to standards or defaults after publication
of the operation instructions.
Position
Choose an installation position in the building where wind, rain and sun can be
measured unhindered by the sensors. The weather station must not be installed
underneath any structural parts from which water can still drip onto the rain sensor
after it has stopped raining or snowing.
The weather station must not be shaded by anything, such as building structures or
trees. There must be at least 60 cm of free space underneath the weather station to
allow it to measure the wind correctly and to prevent it from being snowed in when it
snows. Please ensure that the extended awning does not cast shade on the unit, and
that this is not protected from the wind.
Temperature measurements can also be affected by external influences such as by
warming or cooling of the building structure on which the sensor is mounted, (sunlight,
heating or cold water pipes).
Iron structures or large-surfaces of sheet metal directly behind or near the weather
station reduce the reception quality of the integrated radio clock receiver. Please take
this into account when choosing the installation site. Also, magnetic fields, transmitters
and interfering fields from electricity consumers (e.g. fluorescent lamps, neon signs,
switched-mode power supplies etc.) can interfere with or even cut out reception of the
DCF signal.
Fig. 2
Align the weather station in a southward
direction.
North
South

Weather Station P03/3-RS485 • Version: 11.10.2011 • Subject to technical alterations. Errors excepted.
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Fig. 3
The weather station must be mounted onto a
vertical wall (or pole).
Fig. 4
The weather station must be mounted horizon-
tally in the lateral direction.
Attaching the mount
The weather station comes with a combination wall/pole mount. The mount comes
adhered by adhesive strips to the rear side of the housing.
Fasten the mount vertically onto the wall or pole.
Fig. 5
When wall mounting: flat side on wall, crescent-
shaped collar upward.
Fig. 6
When pole mounting: curved side on pole, collar
downward.

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Fig. 7
An additional, optional accessory available
from Elsner Elektronik is an articulated arm for
flexible wall, pole or beam mounting of the
weather station.
View of rear side and drill hole plan
Fig. 8 a: Dimensions of rear side of housing with bracket. Subject to change for technical
enhancement.

Weather Station P03/3-RS485 • Version: 11.10.2011 • Subject to technical alterations. Errors excepted.
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Fig. 8 b
Drill hole plan
Preparing the weather station
Fig. 9
The weather station cover with the rain sensor snaps in on the left and right along the
bottom edge (see Fig. 9). Remove the weather station cover. Proceed carefully, so as not
to pull off the wire connecting the PCB in the bottom part with the rain sensor in the
cover (wire with push-connector).
Push the connection cable through the rubber seal on the bottom of the weather station
and push the power and bus cables onto their designated terminals. The connection is
by typical telephone cable (J-Y(ST)Y 2 ×2 ×0.8).

Weather Station P03/3-RS485 • Version: 11.10.2011 • Subject to technical alterations. Errors excepted. 11
Aligning the DCF77 antenna
The antenna for DCF77 reception of date and time is located under the PCB in the
housing. Using the set screw (see chapter “PCB layout”, Fig. 1, No. 4), you can turn the
antenna by up to 180° in order to achieve the best alignment. You know you are getting
reception when the control LED (see Fig. 1 No. 3) blinks regularly once every second
(the blinking stops after 59 seconds). The LED stops blinking 30 minutes after switching-
on.
Mounting the weather station
Close the housing by putting the cover back over the bottom part. The cover must snap
in on the left and right with a definite “click”.
Fig. 10
Make sure the cover and bottom part are properly
snapped together! This picture is looking at the
closed weather station from underneath.
Fig. 11
Push the housing from above into the fastened
mount. The bumps on the mount must snap into
the rails in the housing.
To remove it, the weather station can be simply pulled upwards out of the mount,
against the resistance of the fastening.
Notes on installation
Do not open the P03 weather station if water (rain) could get in: even a few drops could
damage the electronics inside.
When mounting, you must take care not to damage the temperature sensor (small PCB
on the bottom of the housing). Also, the wire connecting the PCB with the rain sensor
must not be pulled off or kinked at the terminal.
Remove all existing protection labels after installation.

Weather Station P03/3-RS485 • Version: 11.10.2011 • Subject to technical alterations. Errors excepted.
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It will take 30 seconds after applying the power before the wind measurement will be
output.
Maintenance
The weather station must be checked for dirt on a regular, twice-yearly basis and
cleaned if necessary. A dirty weather station can lead to strange results, such as the
wind sensor failing to work, the station constantly announcing rain, or failure to detect
sunlight.