elsner elektronik P03/3-Modbus Guide

P03/3-Modbus(-GPS)
Weather Stations for Modbus
Item numbers
30146 P03/3-Modbus
30147 P03/3-Modbus-GPS
Installation and Adjustment
EN

1 Contents
Elsner Elektronik GmbH • Sohlengrund 16 • 75395 Ostelsheim • Germany
Weather Stations P03/3-Modbus(-GPS)
Status: 07.06.2022 • Errors excepted. Subject to technical changes.
1. Safety and operating instructions ....................................................... 3
2. Description ........................................................................................... 3
3. Commissioning .................................................................................... 4
3.1. Bus load .................................................................................................................... 4
3.2. Setting up bus communication ............................................................................... 4
3.3. Notes on commissioning ......................................................................................... 5
4. Transfer protocol ................................................................................. 5
4.1. P03-Modbus request string from the master ......................................................... 5
4.2. P03-Modbus output string to the master ............................................................... 6

2 Clarification of signs
This manual is amended periodically and will be brought into line with new software
releases. The change status (software version and date) can be found in the contents footer.
If you have a device with a later software version, please check
www.elsner-elektronik.de in the menu area "Service" to find out whether a more up-to-
date version of the manual is available.
Clarification of signs used in this manual
Safety advice.
Safety advice for working on electrical connections, components,
etc.
DANGER! ... indicates an immediately hazardous situation which will lead to
death or severe injuries if it is not avoided.
WARNING! ... indicates a potentially hazardous situation which may lead to
death or severe injuries if it is not avoided.
CAUTION! ... indicates a potentially hazardous situation which may lead to
trivial or minor injuries if it is not avoided.
ATTENTION! ... indicates a situation which may lead to damage to property if it is
not avoided.

3 Safety and operating instructions
Weather Stations P03/3-Modbus(-GPS) • Version: 07.06.2022 • Errors excepted. Subject to technical changes.
1. Safety and operating instructions
Installation, testing, operational start-up and troubleshooting should
only be performed by an authorised electrician.
CAUTION!
Live voltage!
There are unprotected live components inside the device.
• Inspect the device for damage before installation. Only put undamaged
devices into operation.
• Comply with the locally applicable directives, regulations and provisions for
electrical installation.
• Immediately take the device or system out of service and secure it against
unintentional switch-on if risk-free operation is no longer guaranteed.
Use the device exclusively for building automation and observe the operating instruc-
tions. Improper use, modifications to the device or failure to observe the operating in-
structions will invalidate any warranty or guarantee claims.
Operate the device only as a fixed-site installation, i.e. only in assembled condition and
after conclusion of all installation and operational start-up tasks, and only in the sur-
roundings designated for it.
Elsner Elektronik is not liable for any changes in norms and standards which may occur
after publication of these operating instructions.
For information on installation, maintenance, disposal, scope of
delivery and technical data, please refer to the installation
instructions.
2. Description
The P03/3-Modbus and P03/3-Modbus-GPS Weather Stations measure temper-
ature, wind speed and brightness (eastern, southern and western sun) and recognize
precipitation.
The P03/3-Modbus-GPS additionally receives the UTC signals (Universal Time Coor-
dinated) as well as the site coordinates via an integrated GPS receiver. The direction of
the sun (azimuth) as well as its height (elevation) are calculated and indicated, too.
The devices are Modbus slaves with a RS485 interface and a RTU protocol. The Mod-
bus master, such as PC, SPS or MC can read the P03/3-Modbus(-GPS) Weather Sta-
tions measurement values with “Function 04h (Read Input Register)”.
Functions:
•Brightness measurement with three separate sensors for east, south and
west. Recognition of twilight/dawn

4 Commissioning
Weather Stations P03/3-Modbus(-GPS) • Version: 07.06.2022 • Errors excepted. Subject to technical changes.
•Wind measurement: The wind strength measurement takes place
electronically and thus noiselessly and reliably, even during hail, snow and
sub-zero temperatures. Even turbulent air and anabatic winds in the vicinity of
the weather station are recorded
•Temperature measurement
• Heated precipitation sensor (1.2 watts): No false reports as a result of fog or
dew. Dries quickly after precipitation has stopped
•P03/3-Modbus-GPS only: Integrated GPS receiver. Output of UTC (Universal
Time Coordinated), position (degree of longitude and latitude) and position of
the sun (azimuth, elevation)
3. Commissioning
3.1. Bus load
The RS485 transceiver used has 1/8 of a standard RS485 bus load (1/8 unit load) and
can manage at least a 2.4 V at 54 Ohm bus load. It can, thus, operate a bus with 32
nodes at standard bus load. If nodes with a lower load than the standard bus load are
connected to an RS485 bus, the bus can be operated with more nodes. If, for example,
only nodes with 1/8 bus load are connected, up to 32 x 8 = 256 nodes can be connected
to the bus.
3.2. Setting up bus communication
If all DIP switches are in the OFF position (default setting), the following parameters are
active:
Address: 1
Baud rate: 19,200
Parity: Even
Termination: Disabled
Fig. 1: detailed view DIP switches

5 Transfer protocol
Weather Stations P03/3-Modbus(-GPS) • Version: 07.06.2022 • Errors excepted. Subject to technical changes.
Setting of the slave’s address:
The slave address is set with the help of the 8-bit DIP switch “Address”. If all switches
are in the OFF position, Address 1 is active. Address 0 is reserved for broadcast mes-
sages; addresses greater than 247 are not valid.
The coding of the address is binary. For the address 47, you must e.g. set the switches
3, 5, 6, 7 and 8 to ON.
Interface parameters:
The interface parameters are set with the help of the second 8-bit DIP switch. If the first
4 switches are in the OFF position, the transfer rate amounts to 19,200 bauds. If one of
these switches is set to ON, the corresponding baud rate is applicable.
Parity: If the two switches “ODD” and “NONE” are set to OFF, the parity is EVEN. Only
“ODD” or “NONE” can switch the corresponding parity check.
Switch “Mobu EE”: no function.
Switch “Term.”: bus termination 124 ohms
3.3. Notes on commissioning
The correct wind value may only be supplied approximately 60 seconds after the sup-
ply voltage has been connected.
4. Transfer protocol
4.1. P03-Modbus request string from the master
Example query string for reading all data:
0x01 0x04 0x00 0x00 0x00 0x11 0x30 0x06
Byte
No.
Variable Meaning
0 Slave address xx
1 Command 04H Read Input Registers
2 Start address High Byte xx Register start address
3 Start address Low Byte xx
4 Number of words High Byte xx Number of registers to be read
5 Number of words Low Byte xx
6 CRC Low Byte xx
7 CRC High Byte xx

6 Transfer protocol
Weather Stations P03/3-Modbus(-GPS) • Version: 07.06.2022 • Errors excepted. Subject to technical changes.
4.2. P03-Modbus output string to the master
Byte
No.
Register
address
Variable Meaning
0 Slave address xx
1 Command 04H Read Input Registers
2 Number of bytes xx Master request * 2
3 0 Outdoor temperature H with sign, value/10 =
temperature xx.x °C
4 Outdoor temperature L
5 1 Sun sensor, south H 1...99 Kilolux
6 Sun sensor, south L
7 2 Sun sensor, west H 1...99 Kilolux
8 Sun sensor, west L
9 3 Sun sensor, east H 1...99 Kilolux
10 Sun sensor, east L
11 4 Light H 0...999 Lux
12 Light L
13 5 Wind H Value/10 gives wind speed in m/s
(metres per second)
14 Wind L
15 6 GPS / RTC 1 = GPS;
0 = quartz clock 50 ppm (*)
16 Rain 1 = rain;
0 = no rain
17 7 Day H
18 Day L Date Day (*)
19 8 Month H
20 Month L Date Month (*)
21 9 Year H
22 Year L Date Year (*)
23 10 Hour H
24 Hour L Time Hour (*)
25 11 Minute H
26 Minute L Time Minute (*)
27 12 Second H
28 Second L Time Second (*)
29 13 Azimuth H Value/10 = sun position;
angle 0.0 ... 359.9 degrees (*)
30 Azimuth L
31 14 Elevation H Value/10 = sun position;
height range +/-90.0 degrees (*)
32 Elevation L
33 15 Degree of longitude H Value/100 +/- xxx.xx°;
+ = east / - = west (*)
34 Degree of longitude L

7 Transfer protocol
Weather Stations P03/3-Modbus(-GPS) • Version: 07.06.2022 • Errors excepted. Subject to technical changes.
(*) Only available with version P03/3-Modbus-GPS (with GPS module)
Negative values are represented in the two’s complement notation.
Time indicated as: UTC (Coordinated Universal Time).
35 16 Degree of latitude H Value/100 +/- xxx.xx°;
+ = north / - = south (*)
36 Degree of latitude L
37 CRC L
38 CRC H
Byte
No.
Register
address
Variable Meaning

Elsner Elektronik GmbH Control and Automation Engineering
Sohlengrund 16
75395 Ostelsheim Phone [phone] / 30 945-0 [email protected]
Germany Fax [phone] www.elsner-elektronik.de
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