Sutron Corporation Satlink Operations & Maintenance Manual, Rev 8.04.2 11/3/2016 pg. 81
current loop, then only 8.5 volts will be supplied to the sensor at max sensor current output.
Therefore if a full 12 volts is necessary for the sensor, an external loop supply will be necessary or
alternately the sensor may be wired to a single ended voltage input with the use of an external
100 Ohm accurate and stable resistor also attached to the voltage input port.
9.3.4.6.
Warmup
Analog sensors are powered by Satlink via one of several outputs:
VREF (reference voltage) which provides 2.5V, terminal #26 and #30.
Switched Power which provides whatever voltage is powering Satlink, presumably 12V,
terminal #6
Normally, these outputs are off. Prior to making an analog measurement, Satlink will turn on
these outputs. After that, Satlink waits
Warmup
amount of time (which is expressed in seconds)
before measuring the output of the sensors. This
Warmup
time gives the sensors a chance to
power up and prepare their outputs.
If
Warmup
is set to zero, Satlink will not wait at all prior to measuring. The value
Warmup
should
be set to depends on the analog sensor being measured.
Warmup is also used for
Digital and SDI-12
type sensors. If a such a sensor (or
a wind sensor that uses digital or SDI-12 inputs) is set up with a warmup, then
VREF and Switched Power (SWD#1) will both be turned on. If warmup is set to
zero, those output lines will not be turned on. This is different for
Analog
measurements which turn on the lines regardless whether warmup is zero.
9.3.5.
Measure Type: Battery
This type measures the voltage of the battery connection to Satlink. This measurement is a useful
diagnostic for tracking the performance of the battery and any solar panel or other charging
equipment.
9.3.6.
Measure Type: Wind
The Wind measure type makes it possible to do vector averages of data from wind speed and
direction sensors. The normal average function does not typically work for wind sensors because
of the circular nature of the direction measurement. The vector averages take into account the 0
to 360 degree crossover to produce accurate average.
Follow these steps to setup for Wind averages:
Step 1) Setup a measurement to measure the wind speed (see
Set measurement interval for how often you want the speed measured
Use slope/offset/equation to properly scale the speed to the desired units.
Disable logging for the data (log interval = 24:00:00)
Disable transmission of the data (TX Data Content = Exclude)
Step 2) Setup a measurement to measure the wind direction (see Connecting Prop/Vane
or Anemometer/Vane Wind Sensors)
Set measurement interval for how often you want the direction measured
