La Crosse Technology WS-2510, Operating Instructions Manual

Page: 71 / 75

71
Rain sensor
For the rain sensor, rocker strokes are counted and the status of the current 7
bit binary counter is transmitted. In order to obtain a rainfall quantity, the
current status should be subtracted from that of the previous counter and the
difference should be multiplied by 300 ml. This will give the decrease in rain-
fall.
L21 Rain Lo
b
3
-b
0
lowest 4-bit from 7-bit rocker counter
H21 Rain Hi b
6
-b
4
lowest 3-bit from 7-bit rocker counter
b
7
New flag;
Wind sensor
The wind is transmitted in BCD format in km/h, where the 10 position represents
an exception, as it can be a value > 9. A wind speed of 123.4 km/h would be
transferred in the form <12> <3> <4>. This yields a range of values from 0 to
159.9 km/h.
The wind direction is transferred with a resolution of 5
°
, where the bottom bit in
the first nibble represents the 5 value. Both of the upper bits of the 100 nibble
give the range of fluctuation of the wind direction ((
±
0
°
;
±
22.5
°
;
±
45
°
:
±
67.5
°
)
L22 Wind in km/h b
3
-b
0
0.1 (0-9)
H22 Wind in km/h b
7
-b
4
1 (0-9)
L23 Wind in km/h b
3
-b
0
10 (0-15) ‡ max.: 159.9 km/h
H23 Direction in
°
b
7
-b
4
10 (0-9)
L24 Direction in
°
b
1
-b
0
100 (0-3)
b
3
-b
2
Fluctuation range; 00
±
0
°
; 01
±
22,5
°
; 10
±
45
°
; 11
±
67,5
°
H24 Direction in
°
b
0
5
°
Flag (0 xx0
°
; 1 xx5
°
)
b
3
New flag;
Indoor sensor
The air pressure is transmitted in BCD format in hPa, where the 100 position
represents an exception, as it can be a value > 9. An air pressure of 1,023 hPa
would be transferred in the form <10> <2> <3>. This yields a range of values
from 0 to 1,299 hPa.
The temperature/humidity are transferred as described previously.
L25 Press. in hPa
b
3
-b
0
1 (0-9)
H25 Press. in hPa b
7
-b
4
10 (0-9)
L26 Press. in hPa b
3
-b
0
100 (0-12)
H26 Temp Int in
°
C b
7
-b
4
0.1 (0-9)