P03/3 Modbus

Weather Stations


  • Weather sensor/combined sensor: sun sensor, electronic wind sensor, rain sensor, thermometer
  • Modbus RTU


The P03/3-Modbus and P03/3-Modbus-GPS Weather Stations measure temperature, wind speed and brightness (eastern, southern and western sun) and recognize precipitation.
The P03/3-Modbus-GPS additionally receives the UTC signals (Universal Time Coordinated) 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 Modbus master, such as PC, SPS or MC can read the P03/3-Modbus(-GPS) Weather Stations measurement values with "Function 04h (Read Input Register)".


N° 30146 P03/3-Modbus
N° 30147 P03/3-Modbus-GPS with GPS receiver

  • P03/3-Modbus (30146) P03/3-Modbus (30146)
  • P03/3-Modbus-GPS (30147) P03/3-Modbus-GPS (30147)
  • Brightness measurement with three separate sensors for east, south and west. Recognition of twilight/dawn
  • 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)
HousingPlastic material
ColourWhite / translucent
Protection categoryIP 44
Dimensionsapprox. 96 × 77 × 118 (W × H × D, mm)
Weightapprox. 160 g
Ambient temperatureOperation -30…+50°C, Storage -30…+70°C
Operating voltage24 V DC ±10%.
An appropriate power supply unit can be obtained from Elsner Elektronik
Cable cross-sectionMassive conductors of up to 0.8 mm²
Currentmax. 80 mA, residual ripple 10%
RS485bus load1/8 unit load according to RS485 standard
RS485 driver performancemin. 2.4 V at 54 Ohm bus load
(corresponds to 32 standard RS485 unit loads)
Heating rain sensorapprox. 1.2 W
Measurement range temperature-40…+80°C
Resolution (temperature)0.1°C
Accuracy (temperature)±1.5°C at -25…+80°C
Measurement range wind0…35 m/s
Resolution (wind)0,1 m/s
Accuracy (wind)at ambient temperature -20…+50°C:
±22% of the measurement value when incident
flow is from 45…315°
±15% of the measurement value when incident
flow is from 90…270°
(Frontal incident flow corresponds to 180°)
Measurement range brightness0…99 000 lux
Resolution (brightness)1 lux up to 300 lux
2 lux up to 1000 lux
20 lux up to 99 000 lux
Accuracy (brightness)±15% at 30 … 30 000 lux