Cirrus DESIGN SR20 Information Manual page 316

Section 9 Cirrus Design
Supplements SR20
COUNT DOWN TIMER - The count down timer is controlled by the
START / STOP key. The CRSR and "0 - 9" keys are used to set the
initial time. Pressing the CLR key resets the timer to the initial value.
CONTRAST - Allows adjustment of display contrast. When
CONTRAST is selected, pressing the "8" key reduces contrast and
pressing "9" increases contrast.
DISPLAY - The display function is not available in this installation.
Display brightness is automatically controlled through a photocell in
the front panel.
8 of 8 P/N 11934-S12
Original: 12-26-00