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

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.

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.

address

Variable Meaning

Elsner Elektronik GmbH Control and Automation Engineering

Sohlengrund 16

75395 Ostelsheim Phone +49 (0) 70 33 / 30 945-0 [email protected]

Germany Fax +49 (0) 70 33 / 30 945-20 www.elsner-elektronik.de

You can reach the technical service of Elsner Elektronik under

Tel. +49 (0) 70 33 / 30 945-250 or

[email protected]

We need the following information to process your service request:

• Type of appliance (model name or item number)

• Description of the problem

• Serial number or software version

• Source of supply (dealer/installer who bought the device from Elsner

Elektronik)

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