Samsung SDP-850DX Software User's Manual page 17

Nega.(Negative) : Whenever you press the button, NEGA and POSI will appear alternately on
Aper. (Aperture) : Turns on/off aperture mode. (TEXT MODE/IMAGE MODE)
Fz. (Freeze) : Turns on/off Freeze mode. The images on the View Panel do not change.
Hz(Frequency) : Switches frequency of the presenter between 60Hz and 75Hz. The images
Ext. (External) : Use this to select internal or external image. The image on the View Panel
Displays the status of CONTROL FUNCTION and DIGITAL FUNCTION, PRESET. Shows the
current status of the presenter and also shows the number selected at PRESET status.
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Lamp ON/OFF : Turns the lamp On/Off.
the screen.
on the View Panel do not change.
will not change.