Vaisala AWS310-SITE, Integration Manual

Page: 69 / 78

Sensor Data
number
Code Name Resolution and unit
DRD11A 90 PW Instant present weather
(NWS)
0 (C) = No precipitation
3 (R) = Rain
4
(S) = Snow
2)
5 (IP) = Ice pellets (sleet)
1) The system calculates the value using the available sensor observations.
2) DRD11A reports snow only when air temperature and relative humidity are available from the system.
More information
‣
Enabling RWCC in AWS310-SITE (page 60)
A.1 Surface state reported by DRS511
(WRS codes)
DRS511 surface state is indicated by a 3
‑
digit WRS code:
•
W
arning state
•
R
ain state
•
S
urface state
For example, WRS=206 means that there is an ice alarm ( W=2 ) and the surface state is
snowy ( S=6 ). If there is no warning, the WRS code only consists of 1 character that gives the
surface state.
Table 15 DRS511 surface state values according to Vaisala classes
W Warning R Rain S Surface state Explanation
0 No warning 0 No rain 0 Error –
1
Ice warning
1) 1 Rain 1 Dry Road surface is dry, no ice or snow
2
Ice alarm
2)
2 Cloudy 2 Moist Moisture on the road surface, but only a
little, no ice, no de
‑
icing chemical
3
Frost warning
3)
3 Clear 3 Wet Liquid water on the road surface, no ice, no
de
‑
icing chemical
Appendix A – Vaisala MES 14 data message for AWS310
‑
SITE
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