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[POWER] Power On/Off
Press[POWER 1]to turn on the system，software version is
shown at the top left top corner and then the main display.
Power Failure Alarm
After turning on, it self-checks the both channels of power supply.
Anyone channel is disconnected, it will cause Power Failure alarm.
When power failure alarm is triggered, the main unit buzzer provides
long tone alarm (external alarm will not be on when power failure)
and red words ‘Power Failure’ are flashing.
Alarm Mute
When alarm is triggered, press any button to mute the alarm
(Buzzer and external alarm), but flashing words are still on (External
light alarm is also on). When the alarm is triggered again, the system
will give the alarm again.
Flashing words (External light alarm) disappear when alarm is
turnoff or removed.
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