Xylem SIT65 SATELLITE INTERNET TELEMETRY - Manual (Page 17)

Global Water Instrumentation
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and also has sufficient signal strength. It blinks orange once each second when the
received signal is too weak to communicate.
Buffer: Data Buffer. This yellow LED is lit when there is data in the data buffer
waiting to be transmitted, and off when the data buffer is empty.
Some typical problems indicated by the operation of these LED’s are:
• The SV LED blinks every 5 seconds and the modem LED’s are off. The
battery voltage is too low and the modem has been turned off. Unplug the
battery cable from the controller board and recharge or replace the battery.
• The Signal LED is green and the Buffer LED is yellow and never goes out.
There is good signal strength but data is not being transmitted, possibly due
to satellites not being in view long enough to transmit or because the
transmission is not being accepted due to incorrect Orbcomm account or
modem configurations. Contact Global Water to have the satellite activity
checked.
• The Signal LED is always red. This indicates a weak or absent signal. Check
the antenna position, coax cable and connectors. Another possibility is that
the modem has been damaged due to an electrical surge.
Data is being transmitted but one or more sensor readings are incorrect:
• Check the wiring between the sensors and the controller board.
• For analog sensors, check that the configuration jumpers are set correctly for
the sensor type and supply voltage.
• If all the sensor readings are wrong, press the test button and use a voltmeter
to measure the voltage applied to the sensors while the SV LED is lit. It
should be within 0.5 volts of the battery voltage.
• If a sensor does not appear in the database, check that it is defined correctly
in the sensor configuration window.
• The sensor appears to work but the values in the database are wrong, check
the Adder and Multiplier calibration numbers in the sensor configurations.
• Confirm with Global Water that the sensor channel was enabled when the
SIT65 was programmed at the factory. To reduce data charges, only sensor
channels that are enabled will transmit. Enabling new channels requires that
the unit be returned to the factory, this will also affect subscription fees.