Yudian AI-5500 - Keypad Operation Basics; Key Classification and General Usage; Power and Backlight Key Functions

Keypad Operation
Unit Math
Resolt Hold
Power Light
∨/
∧/
Set
＜ /
Power Key
Backlight
Key
Key 1
Key 2 Key 3
Key 4
Keys are divided into three types including the short keys, long keys and key
combinations. Long keys or key combinations (keys should be pressed and hold
for 2 seconds) are used to realize the functions of Set, Cancel, RJ or Cal, and
short keys are used to realize other functions.
(1) Power Key: Power switch, the automatic shut-off function can be realized
when the menu parameter AutoFF is not equal to 0. That’s to say, automatic
shut-off can be realized when no key-press time is larger than or equal to the time
set by AutoFF (unit: minute), and automatic shut-off is canceled when AutoFF is
equal to 0.
(2) Backlight Key: Backlight switch. The absolute value of the menu parameter
Auto.b.L is the backlight’s automatic shut-off time (second), and the backlight’s
automatic shut-off function is canceled in case of Auto.b.L=0. The positive and
negative signs of Auto.b.L indicate that if the buzzer sound for key-press and alarm
exceeding the lower/upper limit is allowed or not: buzzer sound is allowed when
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