SMS Lite 4G– User Guide © 2021 QTech Data Systems Ltd
Ensure the SIM you are using has a valid SCA number and phone
number and is known to be working (test in a phone beforehand if
necessary).
Insert the SIM card into the SIM socket, noting the correct
orientation is observed. Bear in mind that not all SIMs can be used
in all localities.
Power up the device to
check operation
Connect the power adaptor to the unit and turn on the power.
Do not touch the electronics.
The device will indicate a burst of LED flashes on boot up then
settle into a heartbeat flash (very short) every few seconds.
During boot up the device may indicate an error code. If so, please
note it down.
As an added indication that it is working the LED on the modem
daughterboard itself will slowly flash on and off (on for 1sec off for
1sec each approx..) indicating that the device has registered on a
network.
Send a test message to the device from a phone by creating a new
text message addressed to the device’s phone number: Test
(Note that no PIN number is required).
If the device is operating the LED will be flashing will indicate 1
short pulse every two seconds. This is called the “Heartbeat”
indication.
When it receives the test message the LED will display a test
pattern on the LED for a few seconds consisting of alternating long
and short flashes (i.e., short flash – longer flash – gap – short flash-
longer flash – gap). You will see this pattern a few times.
If the SIM is working properly the device will send a response text
message “SMS Lite comms test succeeded” to the phone.
When it sends this message there will also be a short burst of LED
flashes to indicate that it is transmitting.
If the device fails to do either or both of these, then there is a fault.
If a fault error code is being flashed, see the previous section on
Status LEDs to diagnose the fault, or contact QTech for assistance
after working through the troubleshooting tips below.
Power down and carefully replace the top lid.
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