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A digit greater than 9 has been entered.
No digit has been entered for 10 seconds.
Enable/Disable backlight
1.
Submit Enable/Disable backlight command by pressing the button and wait for 12 blinks.
2.
If the blue backlight is off, it will turn on and vice versa: if it is on, it will turn off.
* Turning off the blue backlight does not affect the blue indication when executing
commands.