User Manual

System Overview
1-17
1-5.4 Additional Keyboard Functions
The A770 offers “Hot Key” commands that provide easy access to system
features. The use of the “Fn” key along with several specific keys (F1-F12)
controls various functions of the A770.
Volume Control
The volume control is adjusted by use of a combination of function keys. To
increase the volume, press the Fn+F4 keys. To decrease the volume, press the
Fn+F3 keys. The “Hot Key Beep” function of these keys will not be supported
to avoid interface with the normal sound effect.
NOTE
The system does not support the Fn+F3 and the Fn+F4
volumn control function when using the DOS program.
Brightness Control
The brightness control is adjusted by use of a combination of function keys.
Press the Fn+F5 keys to darken the screen image. Press the Fn+F6 keys to
brighten the screen image. To further adjust the screen image, press and hold
down the “Fn” key and continue to repeatedly press either the “F5” key or the
“F6” key until you obtain the desired brightness.
If you pressthe Fn+F5 or the Fn+F6 keys to adjust the LCD brightness and
continue to adjust the screen image when it is already set to either the minimum
or the maximum setting, the system will keep on beeping each time the “F5” or
the “F6” key is pressed.
Toggle Key (Option for RS485)
The Hot Key is Fn +F7 to toggle the RX/TX direction.
Keyboard Backlight (Option)
The turn the keyboard backlight “On” and “Off” press the Fn+F8
keys.