Dynon SkyView HDX - USB Usage and Accessibility; External DIM Control (Dimming) Connections

SkyView HDX Display Installation and Configuration
4-24 SkyView HDX System Installation Manual - Revision E
• Wire a serial transmit line from one (1) display to the receive line on the external
serial device. If you have more than one (1) SkyView display, make the same
connection to all SkyView displays.
• Ensure there is a shared ground between the SkyView display and the external
serial device. If you have more than one (1) SkyView display, make the same
connection to all SkyView displays.
• Configure the serial port on the display appropriately under SETUP MENU >
SYSTEM SETUP > SERIAL PORT SETUP, SERIAL PORT X SETUP > TIS
OUT (330 FORMAT).
4.3.10 USB Usage and Accessibility
It is useful to have the USB socket on the display’s wire harness accessible
after installation for file uploads and downloads.
The USB connector is used during the following operations:
• System Software updates.
• Configuration file uploads and downloads.
• Database updates.
4.3.11 External Dim Control (Dimming) Connections
DIM INPUT (Pin 25) The backlight level on a SkyView display can be increased or
decreased using a varying DC voltage of 0 to 36 volts DC. See External Brightness
Management later in this section to configure brightness levels for specific voltages.
DIM OUTPUT (Pin 26) The DIM OUTPUT signal is an approx. 120 Hz (this may change
in future Software revisions) Pulse Width Modulation (PWM) signal directly proportional
to the screen brightness – 100% to 0.02%. This output is designed to directly control the
dim level of devices such as LEDs; a common use is for the back-lighting of switches in
a panel so that they dim at night in conjunction with SkyView’s automatic dim levels.
The DIM OUTPUT (Pin 26) signal is an open collector to ground – it acts as a switch to
ground, and does not source any power itself. Pin 26 can sink a maximum current of
120mA and a maximum voltage of 40V. The DIM OUTPUT signal is not analog and
cannot be used to control the dim level of devices that expect 0-5V, 0-12V, or a resistance
as their dimming input.
Do not connect the DIM OUTPUT (Pin 26) signal from multiple SkyView screens in
parallel. The DIM OUTPUT signals from each display is not synchronous, and this will
lead to inconsistent behavior.
4.3.11.1 Audio Output Electrical Connections
Dynon Avionics recommends that SkyView’s audio outputs be connected to
an unmuted input on your audio panel or intercom. When connected this way,
critical audio alerts generated by SkyView are not muted by ATC