Sutron Corporation Satlink Operations & Maintenance Manual, Rev 8.04.2 11/3/2016 pg. 22
A standard 12VDC lead-acid or Gel battery is typically used as the power source for SL3. Do not
power SL3 off AC power supplies without additional precautions to ensure the power supply is
properly rated and the system is enclosed in a fire protection cabinet.
It is a good practice to make all sensor connections with the unit powered off.
As soon as power is applied, the LED will flash as the unit goes through a self-test sequence. Then
the LED will flash depending on the setup of SL3. The LED will flash green when everything is OK.
Red means an error. Normally the button will flash blue every 4 seconds indicating that Wi-Fi is
turned on and ready for a connection. Other combinations are possible if the unit has been
previously setup. See section 3.5
Please note that it is normal for SL3 to flash red when power is first applied. Once SL3 has
verified good GPS signal (and optionally good Iridium signal), it will switch to flashing green. Do
not walk away from the site until Satlink is flashing green! Connect with LinkComm to see why
Satlink is flashing red.
4.7. Connecting SDI-12 sensors
SL3 supports two independent SDI-12 sensor busses. Each is provided with its own isolated
power connection rated for 500mA. Because SDI-12 sensors are addressable, multiple SDI-12
sensors may be connected to these terminals as long as no two sensors on the same bus have
the same address.
When multiple new SDI sensors are connected to a bus, they should be connected one at a time
so the address can be made unique using the SDI A command. For details, please see the section
titled Setup of SDI sensors.
The figure below shows the typical SDI-12 sensor connections.
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