Sutron Corporation Satlink Operations & Maintenance Manual, Rev 8.04.2 11/3/2016 pg. 76
Precipitation rate, unlike precipitation accumulation, measures the precipitation that has
occurred since the last measurement. So, if the measurement interval is 15 minutes, this
measurement will report the rainfall in the last 15 minutes only.
Multiple measurements can be set up with the same input. For example, if you wanted to know
the daily rainfall and the rainfall during the last hour, set up two measurements: one a Precip
Rate with an interval of one hour, and another as Precip Rate with an interval of one day.
Usually, a slope is applied to convert the counts from the tipping bucket into inches of rain. For
example, setting the Slope to 0.01 means that each tip of the bucket is 0.01”.
Precip readings are de-bounced for 4ms.
9.3.3. Measure Type: SDI-12
Connection:
PORT 1: terminals #13 GND, #14, +12V and #15, Data.
PORT 2: terminals #16 GND, #17, +12V and #18, Data
Note: each port is independent with isolated +12V power and Data connections. Power
is limited to 500mA. Sensors that use more than 500mA (such as bubblers) must
connect to an independent power supply.
SDI-12 is a standardized three wire digital interface. Many manufacturers provide SDI-12 sensors
that measure different environmental effects. SDI-12 sensors provide digital data which improves
their reliability and accuracy in terms of logger sensor communications.
For details on SDI-12, please see the section MORE ABOUT SDI-12.
9.3.3.1. SDI-12 Port
SDI-12 sensors can be assigned to Port1, Port2 or RS485. Remember that multiple sensors can
be connected to either bus as long as each sensor has a unique address. Use RS485 when you
need long cable runs to the sensor and the sensor supports SDI-12 over RS485.
9.3.3.2. SDI-12 Address
Multiple sensors can be connected to the same SDI-12 bus. However, each sensor needs a
unique address. The address is a single ASCII character. Most sensors default with the address 0.
If you are connecting several sensors, connect them one at a time. As each sensor is connected,
issue the 0Ax! command, changing the sensor’s address from 0 to x, where x is a unique number
or letter of your choice.
9.3.3.3. SDI-12 Command
Select the desired SDI-12 command from the drop-down list or enter a unique command into the
text box. The drop-down list includes M!, M1!, MC!, C!, CC!, M2!. Consult the operating manual
for the sensor to know what command to use. The software automatically adds the address
when issuing the command. The software also automatically issues the commands to retrieve
the data after the measurement command is issued.
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