Cirrus SR22 Pilot Operating Handbook page 364

Section 9
Supplements
DTA (Data) – The data entry button is used to select data entry mode.
The first time the DTA button is pressed the selector will enter the data
entry mode, the ENT annunciator will come on, and the SEL
annunciator will flash to indicate the system is ready to accept an
altitude entry. To change baro (BAR) correction, Decision Height (DH),
or Vertical Speed (VS), press the appropriate button on the selector
and rotate the input knob at the right of the display CW to increase the
displayed numbers and CCW to decrease the displayed numbers. Pull
the knob out and rotate as required to change the decimal numbers.
When the system is in the ENT mode, it is not coupled to the autopilot.
In this mode, the autopilot will hold the last vertical speed selected.
It is not necessary to enter the DTA mode to change the
vertical speed, if vertical speed is coupled to the autopilot. If
this is the case, vertical speed changes can be made by
rotating the input knob as required to obtain the new vertical
speed.
While in this mode, pressing DTA a second time will toggle the system
to 'operate' mode. Repeatedly pressing the DTA button will toggle the
system between ENT and 'operate' mode.
BAR (baro) – In this mode, the baro setting used by the altitude
selector may be changed. When the Altitude Selector / Alerter is
initially powered, the BARO mode is displayed automatically at the
completion of the self-test. At other times, it is necessary to enter the
data entry mode by pressing the DTA button and then inputting a new
baro correction. Pressing the DTA button a second time will return the
system to the 'operate' mode.
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• Note •
Cirrus Design
SR22
P/N 13772-108
Revision 06: 05-09-11