Status LED
The SMS Lite has a status LED, labelled ‘Link’ situated next to the antenna connection.
The LED will indicate various events that have occurred:
▪ When the SMS Lite powers on the LED will toggle on and off 5 times slowly.
▪ While the SMS Lite is has connected to the network the LED will indicate 1 short pulse every
two seconds. This is called the “Heartbeat” indication.
▪ Each time the SMS Lite sends an SMS OK the LED will indicate a burst of 5 short pulses. This
is called the “Transmit” indication.
▪ If the SMS Lite tried to send an SMS but there was a problem the LED will indicate 3 long
pulses. This is called the “Transmit fault” indication.
The LED also indicates an error code that can be used to identify particular issues:
▪ 2 pulses indicate that the Modem will not power on.
▪ 3 pulses indicate that the Modem will not respond to commands.
▪ 4 pulses indicate that the SIM card is not inserted.
▪ 5 pulses indicate that the SMS Lite is not registered to the cellular network.
▪ 6 pulses mean that the cellular operator is not supported by the device.
▪ 7 pulses indicate that the SIM card is currently busy. Note, this can occur briefly during the
initialisation phase after it is powered on.
The first two errors (2 and 3 pulses) require the SMS Lite be returned to QTech for service.
Error 4 may be fixed by checking the SIM card inside the SMS Lite.
Error 5 is normally caused by a weak signal to the cell tower.
Error 6 may occur in some overseas locations.
Error 7 may occur if the SIM card is not compatible with the SMS Lite.
There is one other type of error indication, and that is when the SMS Lite tries to send a message but
gets an error code back from the phone network, it will blink 3 times slowly. If the message was sent
successfully it will blink 5 times quickly. The most frequent reason for this error is that there is no
credit on the SIM card but could also be something like the cell tower being busy.
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