Symbol Series 6800, Product Reference Manual

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Series 68XX Product Reference Guide
Adjusting the Screen Contrast
Display Contrast
The screen’s contrast is adjustable to eight levels, making the display more readable in
different lighting conditions, and at various temperatures.
t To reduce (lighten) display contrast, press FUNC X.
t To increase (darken) display contrast, press FUNC Y.
Back Lighting
The backlight illuminates the display in dimly lit areas.
To turn the back light on or off, press FUNC then L, or use the key sequence listed in your
application guide. The back light turns off automatically when the terminal is powered off or
when the terminal has not been used for an amount of time set by the application. See the
application guide for more information.
Entering Data
The Keyboard
The keyboard is used for entering data and issuing commands to the terminal. The keys on
the keyboard are distinguished as modifier keys and character keys. Because terminal
keyboards have fewer keys than PC keyboards, each character key can produce more than
the usual one or two characters. The modifier keys, SHF (Shift), CTL, and FUNC, used
individually or in combination, determine which character or special function the character
keys produce.
Because the keyboard is programmable, your terminal may not work as described here. For
more information and illustrations of other keyboard states, see the Series 3000 Application
Programmer's Guide and your application guide.
Using the Keyboard
Except for during boot operations, the terminal expects the operator to press keys one at a
time. If the terminal has been programmed for it (ERR3000 is loaded), and if two or more
keys are pressed simultaneously, the terminal indicates a Double-Key or Too Many Key error.