XLINK 500/100 Operations & Maintenance Manual page # 36
4.20.
Connecting Lufft Wind Sensors
Lufft has a family of smart weather sensors capable of measuring a variety of parameters,
including wind speed, direction, air temperature, relative humidity, and air pressure. In addition,
it is possible to setup the Lufft sensor to automatically perform average and vector average
calculations on the wind speed and direction in which case you do not need to use the Wind
Measurement type.
The Lufft sensor connects as an SDI-12 sensor to either SDI or RS-485. To set the units use the
SDI command aXUu for US units or aXUm for metric. To set the averaging wind averaging
interval to 5 minutes use the following SDI command: aXAw+5. See the Lufft Manual Family of
Smart Weather Sensors for details.
Use the C or C4 commands to read wind data from the Lufft sensor. The C commands are
needed as the Lufft sensor often has more than 9 parameters in its output. The response to the
C command may provide different data based on what model is connected. For example, the
WS200-UMB provides the following data in response to the C command:
WS200 UMB
Parameter
Description
0
Wind Speed (avg) *units based on
settings in the WS200
1
Wind Speed (max)
2
Wind Direction (vector)
3
Wind Direction (act)
4
Compass Heading (act)
5
Wind Speed (act)
6
Wind Speed (min)
7
Wind Speed (vct)
8
Wind Quality
9
Wind Direction (min)
10
Wind Direction (max)
11
Wind Direction corr (act)
Other Lufft sensors with temperature and other measurements provide the wind speed and
direction as parameters 3 (average speed), 4 (max speed) and 5 (vector direction) and 14 (vector
speed) with detailed wind information available using C4. Consult the Lufft manual for details.
4.21.
Connecting Digital Outputs
One digital output line is provided: DOUT#1.
for details.
4.22.
Connecting Samplers Triggered by Stage
Many samplers can be triggered to collect a sample via Digital output. Connect DOUT#1 to the
“trigger” line of the sampler along with ground and program an equation to generate the pulse
based on the desired criteria.
For example, to trigger a sample when the stage is > 12.50 feet do the following:
