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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:
Data bits:
Stop bit:
Parity:
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
Char
No.
1
W
2
OT: Sign
3
OT: 1st digit
4
OT: 2nd digit
5
OT: Point
6
OT: 3rd digit
7
SuS: 1st digit
8
SuS: 2nd digit
9
SuW: 1st digit
10
SuW: 2nd digit
11
SuE: 1st digit
12
SuE: 2nd digit
13
Twilight
14
Daylight 0-999Lx
15
Daylight 0-999Lx
16
Daylight 0-999Lx
17
Wind: 1st digit
18
Wind: 2nd digit
19
Wind: Point
20
Wind: 3rd digit
Weather Station P03/3-RS485 • Version: 11.10.2011 • Subject to technical alterations. Errors excepted.
19200 Baud
8
1
none
Meaning
Weather data start
Outdoor temperature sign • / +
Outdoor temperature 1st digit (tens)
Outdoor temperature 2nd digit (ones)
Outdoor temperature point
Outdoor temperature 3rd digit (tenth)
Sun South 1st digit (tens)
Sun South 2nd digit (ones)
Sun West 1st digit (tens)
Sun West 2nd digit (ones)
Sun East 1st digit (tens)
Sun East 2nd digit (ones)
Twilight: J = Yes; N = No
Daylight (1st digit hundreds)
Daylight (2nd digit tens)
Daylight (3rd digit ones)
Wind 1st digit (tens)
Wind 2nd digit (ones)
Wind Point
Wind 3rd digit (tenth)
in °C
1-99 klx
< 10 lx
0-999 lx
in m/s
5