LXNAV Airdata indicator User manual

Rev #02 Version 1.0 November 2020
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Airdata indicator
User Manual
Version 1.0
LXNAV d.o.o. • Kidričeva 24, 3000 Celje, Slovenia • tel [phone] fax [phone]
[email protected] • www.lxnav.com

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1Important notices 3
1.1 Limited warranty 3
2Packing lists 4
3ADI basics 5
3.1 The ADI at a glance 5
3.1.1 ADI features 5
3.1.2 Interfaces 5
3.1.3 Technical data 5
4System description 6
4.1 Push buttons 6
4.2 SD card 6
4.3 Switching on the unit 6
4.4 User input 6
4.4.1 Navigating menus 7
4.4.2 Checkbox 7
4.4.3 Selection control 7
4.4.4 Spin control 8
4.4.5 Slider control 8
5Operating modes 9
5.1 Main screen 9
5.2 QNH mode 9
5.3 Setup mode 10
5.3.1 Display 11
5.3.2 Airspeed 12
5.3.2.1 Speeds 12
5.3.2.2 Calibration table 12
5.3.2.3 TAS method 13
5.3.3 Vertical speed 13
5.3.4 Temperature 13
5.3.5 Battery 13
5.3.6 Warnings 14
5.3.6.1 Altitude warning 14
5.3.6.2 Speed warning 14
5.3.7 Units 15
5.3.8 System Time 15
5.3.9 Password 15
6Wiring and static ports 16
6.1 Pinout 16
6.2 Pressure ports connections 16
7Installation 17
7.1 Cut-out 17
8Revision history 18

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1Important notices
The Airdata indicator (ADI) is designed for informational use only. All information are
presented for reference only. It is ultimately the pilot's responsibility to ensure that the
aircraft is being flown in accordance with the manufacturer's aircraft flight manual. The
indicator must be installed in accordance with applicable airworthiness standards according
to the country of registration of the aircraft.
Information in this document is subject to change without notice. LXNAV reserves the right
to change or improve their products and to make changes in the content of this material
without obligation to notify any person or organisation of such changes or improvements.
A Yellow triangle is shown for parts of the manual which should be read carefully
and are important for operating the Airdata indicator.
Notes with a red triangle describe procedures that are critical and may result in
loss of data or any other critical situation.
A bulb icon is shown when a useful hint is provided to the reader.
1.1 Limited warranty
This ADI product is warranted to be free from defects in materials or workmanship for two
years from the date of purchase. Within this period, LXNAV will, at its sole option, repair or
replace any components that fail in normal use. Such repairs or replacement will be made at
no charge to the customer for parts and labour, the customer shall be responsible for any
transportation cost. This warranty does not cover failures due to abuse, misuse, accident, or
unauthorised alterations or repairs.
THE WARRANTIES AND REMEDIES CONTAINED HEREIN ARE EXCLUSIVE AND IN LIEU OF
ALL OTHER WARRANTIES EXPRESSED OR IMPLIED OR STATUTORY, INCLUDING ANY
LIABILITY ARISING UNDER ANY WARRANTY OF MERCHANTABILITY OR FITNESS FOR A
PARTICULAR PURPOSE, STATUTORY OR OTHERWISE. THIS WARRANTY GIVES YOU
SPECIFIC LEGAL RIGHTS, WHICH MAY VARY FROM STATE TO STATE.
IN NO EVENT SHALL LXNAV BE LIABLE FOR ANY INCIDENTAL, SPECIAL, INDIRECT OR
CONSEQUENTIAL DAMAGES, WHETHER RESULTING FROM THE USE, MISUSE, OR
INABILITY TO USE THIS PRODUCT OR FROM DEFECTS IN THE PRODUCT. Some states do
not allow the exclusion of incidental or consequential damages, so the above limitations may
not apply to you. LXNAV retains the exclusive right to repair or replace the unit or software,
or to offer a full refund of the purchase price, at its sole discretion. SUCH REMEDY SHALL
BE YOUR SOLE AND EXCLUSIVE REMEDY FOR ANY BREACH OF WARRANTY.
To obtain warranty service, contact your local LXNAV dealer or contact LXNAV directly.
September 2020 © 2020 LXNAV. All rights reserved.

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2Packing lists
Airdata indicator (ADI)
Power supply cable
OAT probe

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3ADI basics
3.1 The ADI at a glance
The Airdata indicator or ADI is standalone unit designed to measure and indicate airspeed,
altitude and outside air temperature. The unit has standard dimensions that will fit into the
instrument panel with an opening of 57 mm diameter.
The unit has integrated high precision digital pressure sensors. The sensors are sampled 50
times per second. Real time data is displayed on a QVGA 320x240 pixel 2.5-inch high
brightness color display. Three push buttons are used to adjust values and settings.
3.1.1 ADI features
An extremely bright 2.5" QVGA color display readable in all sunlight conditions with
the ability to adjust the backlight
Three push buttons are used for input
Logbook
100 Hz sampling rate for very fast response.
3.1.2 Interfaces
Serial RS232 input/output
Micro SD card
3.1.3 Technical data
Power input 8-32V DC
Consumption 90-140mA@12V
Weight 200g
Dimensions: 57 mm cut-out 61x61x48mm

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4System description
4.1 Push buttons
Airdata indicator has three push buttons. It detects short or long presses of the push
button. A short press means just a click; a long press means pushing the button for more
than one second.
The three buttons between have fixed functions. The top button usually increases a value or
move focus up. Middle button is used to confirm or dismiss selection. The lower button is
used to decrease a value or move focus down.
4.2 SD card
SD card is used for updates and transfer of settings to other device. To update device simply
copy update file to SD card and restart the device. You will be prompt for an update. For
normal operation, it is not necessary to have SD card inserted.
Micro SD card is not included with new ADI.
4.3 Switching on the unit
There is no special action required to switch on the unit. When power is applied to the
device, it will switch on and will be ready for immediate use.
4.4 User input
The user interface consists of dialogues which have various input controls. They are
designed to make the input of names, parameters, etc., as easy as possible. Input controls
can be summarized as:
Checkbox,
Selection control,
Spin control,
Slider control
Inside the dialog press top button to move the focus to control above currently selected or
press bottom button to move next control below currently selected. Press middle button to
change value of focused control.
Increase value or move up in
menu.
Short press to do action
Long press enter setup mode
or cancel action
Decrease value or move down
in menu.

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4.4.1 Navigating menus
When you press middle button for longer time, you will get into setup menu. Press upper
and lower button to move focus. Quickly press middle button to enter submenu. Long press
middle button to exit submenu or select Exit option in menu.
4.4.2 Checkbox
A checkbox enables or disables an option. Press middle button to toggle selected option. If
an option is enabled a check mark will be displayed, otherwise an empty rectangle will be
drawn.
4.4.3 Selection control
Selection control is used to select a value from a list of predefined values. Press middle
button to enter edit mode. Currently selected value will be highlighted in blue. Use upper
and lower button to select other value. Confirm selection with short press on middle button.
Long press middle button to cancel selection and exit without changes.

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4.4.4 Spin control
Spin control is used to select a numerical value. Press middle button to enter edit mode.
Currently selected value will be highlighted in blue. Use upper and lower button to increase
or decrease value. Long press will make a bigger increase or decrease. Confirm selection
with short press on middle button. Long press middle button to cancel selection and exit
without changes.
4.4.5 Slider control
Some values, such as volume and brightness, are displayed as a slider.
Press middle button to enter edit mode. Slider background colour will change to white. Use
upper and lower button to increase or decrease value. Long press will make a bigger
increase or decrease. Confirm selection with short press on middle button. Long press
middle button to cancel selection and exit without changes.

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5Operating modes
The Airdata indicator has only one main screen, quick menu for QNH and setup mode.
When powered on, main screen will be shown. Short press any button to access QNH menu.
Long press middle button to enter setup mode
5.1 Main screen
Primary function of ADI is to display indicated airspeed. Indicated airspeed is displayed with
needle on user customizable dial. A great care has been taken when designing a dial, which
is nonlinear to have better resolution in thermaling range. See chapter 5.3.2.1 how to
customize speeds markings on the dial.
In the middle of screen altitude is displayed as rolling counter. On the right side vertical
speed is drawn as a magenta bar. Additionally, two numerical values can be show. See
chapter 5.3.1 how to customize main screen.
5.2 QNH mode
QNH mode is used to enter QNH. Press and key to enter this mode. It will display current
QNH and elevation, if you are still on the ground. Press upper or lower button to change
QNH. On th ground display will look like one the picture below.
Upper numerical
parameter
Vertical speed
indicator
Altitude rolling
counter.
Lower numerical
value
Altitude units
Airspeed units
Indicated
airspeed needle
Dial with custom
airspeed
markings

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While flying QNH display will looks like next picture.
QNH display will be automatically closed few seconds after last button was pressed.
5.3 Setup mode
Long press middle button to enter setup mode. Setup is used to configure your Airdata
indicator.
A setup menu with following options will be displayed:
Display –use this menu to set brightness, customize numerical parameters, set theme
color and needle size
Airspeed –Define speed markings, airspeed calibration table and method for true
airspeed calculation.
Vertical speed –change vertical speed filter and total energy compensation, if needed.
Temperature –define temperature offset.
Battery –select chemistry of battery, which is being used for ADI in order to have
proper battery indication
Warnings –ADI can display user defined warnings for speed and altitude.
Units –define system of measure.
System time –enter current time and data for recording purposes.
Password –used to reach system setup and various calibrations.
When SD card is inserted all settings will be copied to it once you exit setup
mode. Settings are stored in file named settings.bin. Insert such SD card to other
ADI and you will be prompt to copy settings from SD card to device. With this
method you can easily duplicate settings.

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5.3.1 Display
Use this menu to set brightness, customize numerical parameters, set theme color and
needle size.
Display row 1 and Display row 2 are used to select values which are shown in top row or
bottom row. User can select among following options: QNH, Battery voltage, Outside
temperature, Vertical speed, Density altitude, Flight level, Height above take-off elevation,
Altitude, True airspeed, Indicated airspeed and none.
Colour style –Gauge defines background color of airspeed dial, which can be black or
default white.
Cursor style, user can choose between three different cursor styles.
Brightness sets current screen brightness. If automatic brightness is enabled then this
control will show current brightness.
If the Automatic Brightness box is checked the brightness will be automatically adjusted
between the minimum and maximum values.
Get Brighter In specifies in which time period the brightness can reach the required
brightness.
Get Darker In specifies in which time period the brightness can reach the required lower
brightness.
Night Mode Darkness is used in night mode, which is not implemented yet.

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5.3.2 Airspeed
In this menu user can define speed markings, airspeed calibration table and method for true
airspeed calculation.
5.3.2.1 Speeds
ADI allows user to define all the speed markings for the dial. Please refer to aircraft manual
to enter appropriate speeds.
You can also enter Vne at different altitudes. If Vne are entered for different
altitude, then speed marking for Vne will change with altitude and gives a pilot
proper warning for maximum speed.
5.3.2.2 Calibration table
User can make corrections to the indicated airspeed for instrument and position error. Use
this table to enter corrections. By default, two points are entered, one for Vso and one for
Vne.

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To add new point, select Add Point line and enter IAS and CAS. Press Save button to add or
exit to cancel. Press delete line to delete a point.
5.3.2.3 TAS method
You can select three methods how true airspeed is calculated. Altitude only method is
using standard temperature profile with altitude and shall be used only in case OAT probe is
not mounted or not working properly, Altitude and OAT is method which takes into
account density change due to altitude change and temperature change. Altitude, OAT
and Compressibility is method which takes into account also compressibility of the air and
shall be used for faster aircrafts.
5.3.3 Vertical speed
Vario bar filter value defines response of the vertical speed indication. Higher value of filter
will cause more slow and more filtered response of vertical speed indication.
TE compensation is used mainly for gliders in order to show total energy change rather than
vertical speed. Set to 100%, if you want to have compensated vertical speed indication or
leave on 0 to have non-compensated vertical speed.
5.3.4 Temperature
A temperature offset can be defined here. Temperature offset is same for the whole
temperature range. Temperature offset should be set on the ground. If temperature
indication is the air is not ok, you should consider relocating OAT probe.
5.3.5 Battery
Airdata indicator can also shows battery information in case it is running on batteries. Select
battery type from the list or enter values manually.

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5.3.6 Warnings
The indicator can display warnings for user defined altitudes and speeds. Warning will be
displayed in center of the screen with red blinking background and critical parameter written
in the middle of the screen.
5.3.6.1 Altitude warning
Two altitude warnings can be defined. First altitude warning is set for altitude ceiling and will
be triggered “warn me before” seconds you are going to reach this ceiling. Second warning
is defined for altitude floor and will be triggered when you are about to descend to this
altitude.
5.3.6.2 Speed warning
User can select airspeed alarm for stall speed and for maximum speed.

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5.3.7 Units
In this menu you can define system of measure for all the data. Select from predefined sets
or change each unit separately.
5.3.8 System Time
In this menu the user can set the local time and date. Available is also an offset from UTC.
UTC is used within the recorder.
5.3.9 Password
Password menu is used to access special function. Mostly calibration parameters and
resetting sensors, etc. Please consult manufacturer before using it.
01043 - Auto zero of the pressure sensor
00666 - Reset all settings to factory default
16250 - Show debug info
40000 –Set airspeed threshold

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6Wiring and static ports
6.1 Pinout
Power connector is pin compatible with S3 power or any other FLARM cable with RJ12
connector.
6.2 Pressure ports connections
Two ports are on the back of Airdata indicator Pstatic static pressure port and Ptotal pitot or
total pressure port.
Pin
Number
Description
1
Power supply input
2
No connection
3
Ground
4
RS232 RX (data in)
5
RS232 TX (data out)
6
Ground

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7Installation
The Airdata indicator requires a standard 57mm cut-out. Power supply scheme is compatible
to any FLARM device with RJ12 connector. On the back it is fitted with two pressure ports for
total pressure and static pressure.
More about pinout and pressure ports connections is available in chapter 7: Wiring and static
ports.
7.1 Cut-out
The length of the screw is limited to maximum 4mm!

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8Revision history
Rev
Date
Comments
01
September 2020
Initial release
02
November 2020
Updated Ch. 4.2