Note: buzzer alarm can be enable/disable by function button, if buzzer
alarm is disabled, all present alarm is muted except that the button press
still has a tick beep. Buzzer alarm will be enabled automatically once new
alarm arises.
Interface
In order to make sure all segments are OK, LCD begins to do self-test after
power on. During self-test, all the segments will be lighted for 2 seconds,
then the LCD will turn to normal display status.
Fig. 4-2 The default LCD display
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