Table 6-4: RS-232 serial instructions
Instruction
Function
SerialFlush()
Clears the buffer.
Scan()
Establish a scan rate.
SerialOut()
Send command to sensor.
SerialIn()
Set up the COM port to receive the incoming serial data. Note that in
the beginning of the CRBasic program, the variable used in
SerialIn()
instruction needs to be declared as an ASCII string
format.
SplitStr()
Split out digital count value from the input string.
6.3 Siting considerations for wind
measurements
Locate the sensor away from obstructions such as trees and buildings. The horizontal distance
from an obstruction should be at least ten times the height of the obstruction. If it is necessary to
mount the sensor on the roof of a building, the height of the sensor above the roof, should be at
least 1.5 times the height of the building. The sensors should also be mounted away from
electrical equipment that generate magnetic fields, which will affect the electronic compass.
The sensor has four notches that need to be aligned to the magnetic north. A declination
correction factor can be added to the Magnetic North heading from the wind direction
measurement. Map and declination figures in decimal figures can be obtained from
or
www.ngdc.noaa.gov/geomag/declination.shtml
.
6.4 Mounting
Two mounting bracket kits are offered for the MetSENS-series sensors. The ClimaVUE 50,
MetSENS, or WindSonic Mounting Pipe Kit secures the sensor to a crossarm and consists of a
mounting tube, three pan truss screws, CM220 Right Angle Mounting bracket, two U-bolts, and
four nuts. The MetSENS or WINDSONIC Stand Mount secures the sensor to either a vertical pole
or a horizontal crossarm. It consists of a mounting stand, three pan screws, a plate, two carriage
screws, two washers, two lock washers, and two wing nuts.
MetSENS-Series Compact Weather Sensors
14
