7.9.21.12 DNS
The CR1000 provides a Domain Name Server (DNS) client that can query a DNS
server to determine if an IP address has been mapped to a hostname. If it has, then
the hostname can be used interchangeably with the IP address in some datalogger
instructions.
7.9.21.13 SMTP
Simple Mail Transfer Protocol (SMTP) is the standard for e-mail transmissions.
The CR1000 can be programmed to send e-mail messages on a regular schedule
or based on the occurrence of an event.
7.9.22 Wind Vector
The WindVector() instruction processes wind-speed and direction measurements
to calculate mean speed, mean vector magnitude, and mean vector direction over a
data-storage interval. Measurements from polar (wind speed and direction) or
orthogonal (fixed East and North propellers) sensors are supported. Vector
direction and standard deviation of vector direction can be calculated weighted or
unweighted for wind speed.
7.9.22.1 OutputOpt Parameters
In the CR1000 WindVector() instruction, the OutputOpt parameter defines the
processed data that are stored. All output options result in an array of values, the
elements of which have _WVc(n) as a suffix, where n is the element number. The
array uses the name of the Speed/East variable as its base. Table OutputOpt
Options
(p. 296) lists and describes OutputOpt options.
Table 53. WindVector() OutputOpt Options
Option Description (WVc() is the Output Array)
0
WVc(1): Mean horizontal wind speed (S)
WVc(2): Unit vector mean wind direction (Θ1)
WVc(3): Standard deviation of wind direction σ(Θ1). Standard deviation is
calculated using the Yamartino algorithm. This option complies with EPA
guidelines for use with straight-line Gaussian dispersion models to model plume
transport.
1
WVc(1): Mean horizontal wind speed (S)
WVc(2): Unit vector mean wind direction (Θ1)
2
WVc(1): Mean horizontal wind speed (S)
WVc(2): Resultant mean horizontal wind speed (U)
WVc(3): Resultant mean wind direction (Θu)
WVc(4): Standard deviation of wind direction σ(Θu). This standard deviation is
calculated using Campbell Scientific's wind speed weighted algorithm. Use of the
resultant mean horizontal wind direction is not recommended for straight-line
Gaussian dispersion models, but may be used to model transport direction in a
variable-trajectory model.
3
WVc(1): Unit vector mean wind direction (Θ1)
296
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