4
Notes on commissioning
Weather Station P04/3-RS485
• Version: 09.06.2022 • Errors excepted. Subject to technical changes.
•
Temperature measurement
•
Heated
precipitation sensor
: No false reports as a result of fog or dew. Dries
quickly after precipitation has stopped
Models:
•
P04/3-RS485-GPS:
With integrated
GPS receiver
. Output of UTC (Universal
Time Coordinated), position (degree of longitude, latitude) and solar position
(azimut, elevation)
•
P04/3-RS485-CET:
With integrated
GPS receiver
. Output of Central
European Time (CET), automatic summer/winter time switch-over
•
P04/3-RS485 basic:
without time reception
3.
Notes on commissioning
The correct wind value is only supplied about 30 seconds after the supply voltage has
been connected.
4.
Transfer protocol
All characters and/or digits are based on the ASCII standard, i.e. every reading pro-
cessed internally as an integer or float value will always be broken down into and trans-
ferred 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 by adding all transferred bytes (without checksum).
Units:
Temperatures in degrees Celsius
Sun intensity in kilolux
Daylight in Lux
Wind in metres per second
4.1. Protocol P04/3-RS485-GPS
Byte No
Char
Description
1
G
Start of string
2
+ / -
Outdoor temperature in °C, sign
3
0 … 9
Outdoor temperature in °C, tens digit
4
0 … 9
Outdoor temperature in °C, units digit
5
.
Outdoor temperature in °C, decimal point
6
0 … 9
Outdoor temperature in °C, tenths digit
7
0 … 9
Sun south in kLux, tens digit
