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Please note that it is normal for the red LED to flash when power is first applied. Once the unit has verified
good network signal (Iridium or Cell), it will switch to flashing green. Do not walk away from the site until
the unit is flashing green! Connect with LinkComm to see why the red LED is flashing.
Normally the button will flash blue every 3 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
5.4.2
Connecting the Solar Panel
The XLink 500 features a built-in solar panel regulator capable of handling a solar panel providing up to 20
Watts. The panel shall be connected to the terminal inputs labeled SOLAR. The panel should provide a
voltage in the range of 16 to 22 Volt.
The solar panel input with sufficient sun illuminating the panel will power the station in situations where
the battery needs to be removed from the circuit momentarily for replacement. Long-term operation
without the battery connected is not recommended, and transmissions via internal Iridium or Cellular
modems may not be possible as the solar regulator is not capable of supplying the necessary current
during transmissions.
o
You may connect a power source other than a solar panel (e.g., a power supply) as long as it
conforms to the voltage specification above.
o
Please note that a battery is still required for long-term operation and to ensure enough current is
available for reliable transmissions.
Provisions are made in the circuitry to prevent discharge of the battery through the solar panel at night.
No external reverse blocking diode is needed. In addition, the regulator is of a series pass type which
means that a 15V DC power supply could be connected to the solar panel inputs to float charge the
battery.
Assistance in calculating power budgets may be found here:
5.5
Connecting SDI-12 sensors
There is an SDI-12 bus for sensor connections. The bus has an isolated power connection rated for 500mA.
Because SDI-12 sensors are addressable, multiple SDI-12 sensors may be connected to this terminal if no
two sensors 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
Summary of Contents for SUTRON XLINK 100
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