Dynon Avionics SkyView System Installation Guide - Manual (Page 210)

Autopilot Servo Installation, Configuration, and Calibration
10-14 SkyView System Installation Guide - Revision S
(Optional) External LEVEL Button
SkyView supports an external button that engages LEVEL mode in the same way that pressing
MAIN MENU > AUTOPILOT > LEVEL and the LEVEL button on the (optional) SV-AP-PANEL. This
allows the pilot to mount a permanent, dedicated button on the panel or yoke/stick.
This button should be a single pole, normally open, momentary button. Verify that the two
terminals of the button are shorted when the button is pressed and open (no-connect) when
the button is released. One terminal of the button should (momentarily) connect the SkyView
display 37-pin connector Pin 28 (Contact #1 Input), and the other terminal of the button should
connect to Ground.
During bootup, SkyView checks the status of the External LEVEL Button. If SkyView detects that
the button is pressed (the input is grounded) during bootup, the External LEVEL Button is
assumed to be stuck (or incorrectly installed), resulting in:
1. A message is displayed: EXT LEVEL BUTTON STUCK, and
2. The External LEVEL Button input is ignored for the remainder of the time SkyView is
operational (will be checked again at next bootup).
Considerations for External LEVEL Button in SkyView Systems With Multiple SkyView Displays
Prior revisions of the SkyView System Installation Guide recommended that in
SkyView systems with multiple displays, for redundancy the External LEVEL
Button should be connected to all SkyView displays in parallel. The following
recommendations supersede that earlier guidance.
Do not connect CONTACT 1 / LEVEL BUTTON inputs of multiple SkyView displays directly
together. If you do so, when one display is powered off, it will cause displays that are powered
on to see the CONTACT 1 / LEVEL BUTTON input as being pushed (the display powered off will
“ground” the input). This could cause the unintentional activation of LEVEL mode or could
prevent the External Level Button from operating.
Installation Options For External LEVEL Button on Multiple SkyView Displays
Choose one of these options if you have multiple SkyView displays and you want to connect the
External LEVEL Button on all displays for failover / redundancy:

Connect the External LEVEL Button to only one display. The External LEVEL Button will
operate for all displays in the SkyView system as long as the display the External LEVEL
Button is wired to is powered on and operating normally. As a non-flight-critical
function, the loss of the External LEVEL Button in some display failures may be
acceptable for your installation. Use of the LEVEL function via the SkyView soft keys via
any operating SkyView display is still possible, as well as pushing the LEVEL button on
the (optional) SV-AP-PANEL.

Install a diode for each individual display’s connection to the External LEVEL button. The
diode should be installed with the cathode end (painted band on the diode) oriented
towards the External LEVEL button, and should be installed in-line with the contact wire
between the SkyView display and the External LEVEL button. One diode is needed per
display. Any diode will work for this application. An example diode is the very common