Quantum and Evolution Series Installation and Operating Handbook
7-4
On a menu, the
BACK
key is used to navigate to the previous screen. When entering or
selecting a new value, the
BACK
key is used to cancel any change to the current value
and move backward to the previous screen.
7.2.1.3 Alphanumeric
Keys
The alphanumeric keys provide numeric entry. In special cases, where it is valid to enter
alphabetic characters, repeated pressing of a numeric key will cause the key to cycle
through its associated lower case and then upper case alphabetic characters (in a similar
way to a mobile phone).
7.2.1.4 Special Function Keys
Help
Help information can be displayed for any M&C control by holding down the 0 key and
pressing the
Left
arrow key together while the screen containing the M&C control is
displayed. This brings up scrollable text that explains the M&C control’s function.
Pressing the 0 key and
Left
arrow key together for a second time removes the Help text
and reverts the display back to its previous contents.
Keyboard Lock
The keypad can be locked against inadvertent use by holding down the 0 key and
pressing the
MAIN
key together at the same time. Pressing the two keys again at the
same time unlocks the keypad.
LCD Contrast
The contrast of the LCD display can be adjusted by holding down the 0 key and pressing
the
Up
(or
Down
) arrow key together at the same time. The
Up
arrow key increases the
contrast and the
Down
arrow key decreases the contrast.
LCD Backlight
The LCD backlight can be switched off or on by holding down the 0 key and pressing the
ENTER
key together at the same time.
Log/Alarm Clear
The system log and system alarms can be cleared by pressing the 0 key when on the
relevant log or alarm display screen.
Buffer Overflow / Underflow clear
The buffer Overflow and Underflow slip counters can be cleared by pressing the 0 key
when on the relevant status/demodulator display screen.