Vega ASV-1 Manuel utilisateur
Introduction
The ASV-1 is a 2 1/4” sunlight readable encoding altimeter, airspeed and wide range vertical speed indicator
The altimeter contains an internal high accuracy 24 bit digital altitude sensor which calculates altitude from -1000 ft up to
a maximum of 35000 ft The ASV-1 outputs various formatted RS232 serial data protocols compatible with serial input
transponders such as that from Garmin, Magellan, Northstar, Trimble, Microair etc The altimeter can display altitude in
feet or meters and local pressure can be set in millibars or inches of mercury
The VSI indicator can be displayed in either feet/minute (ft/min) or meters/second (m/s) The VSI can be calibrated by the
user once the instrument has been installed in the aircraft
Airspeed is based on the pressure generated by a pitot tube system and a static port is provided as well for use by high
speed aircraft The ASV-1 instrument measures airspeed from 16mph to 250mph and is well suited to slower aircraft due
to very good sensitivity and linearity at low air speeds Airspeed can be indicated in statute miles per hour (mph),
kilometers per hour (km/h) or nautical miles per hour (kts) The ASV-1 also provides a programmable Vs and Vne
airspeed alarm output ASI sensitivity can be calibrated by the user to cater for errors caused by pitot tube placement
In addition, the ASV-1 provides an encoder test function, flight timer since takeoff and records the maximum airspeed
reached The ASV-1 provides a parallel Gillham code interface when used in conjunction with the MGL Avionics CNV-
ALT
Vega ASV-1
Altimeter, Airspeed (ASI) and Vertical
Speed Indicator (VSI)
Operating Manual – English 1.
Vega ASV-1 Operating Manual Page 2
1 Features
•Large 1.8” high resolution 160x128, sunlight readable, wide viewing angle, 1000 cd/m2 T T LCD display
• An internal high accuracy 24 bit digital altitude sensor calculates altitude from –1 ft up to a maximum
of 35 ft (-3 4m to 1 668m)
• The ASV-1 outputs various formatted RS232 serial data protocols compatible with serial input
transponders such as that from Garmin, Magellan, Northstar, Trimble, Microair etc.
• Provides a parallel Gillham code interface for transponders when used in combination with the MGL
Avionics CNV-ALT
• Built in encoder test function
• The altimeter can display altitude in feet or meters
• Local pressure can be set in millibars or inches of mercury
• Contains a wide range VSI indicator from +/-2 ft/min to as high as +/-1 ft/min
• VSI units can be in feet/minute (ft/min) or in meters/second (m/s)
• Measures airspeed from 16mph to 25 mph and is well suited to slow aircraft due to very good sensitivity
and linearity at low air speeds
• Includes a flight timer since takeoff
• Airspeed units can be set to miles per hour (mph), kilometer per hour (km/h) or nautical miles per hour
(kts)
• Contains a programmable Vs and Vne airspeed alarm output
• Records maximum airspeed reached in permanent memory
• Standard 2 1/4” aircraft enclosure (can be front or rear mounted)
• Rotary control plus 2 independent buttons for easy menu navigation and user input
• Wide input supply voltage range of 8 to 3 V DC with built in voltage reversal and over voltage protection
for harsh electrical environments
• 1 year limited warranty
Vega ASV-1 Operating Manual Page 3
2 ASV-1 Layout
3 Main Display
F2 / Down Button:
Menu system: Softkey button
Normal display: Press to view the
Timers and Max Values display
Sunlight readable color
graphic display:
Backlight can be adjusted in the
menu system
Rotary Control (Up/Down) & Enter Button:
Press the rotary control during the normal display screens to access the menu system Rotate anti/clockwise
for up/down menu scrolling Rotate the rotary control during the normal display mode to adjust the local
pressure Local pressure can be set in either mB or in “Hg
F1 / Up Button:
Menu system: Softkey button
Normal Display: Start / Stop the
flight timer (Manual flight only)
2 1/4” enclosure
Can be front or rear mounted
VSI scale indication
VS I (Vertical Speed Indication)
VSI unit
Altitude value
Local pressure readout (Either in mB or in “HG)
VSI value
Altitude unit
Airspeed unit
Airspeed value
Vega ASV-1 Operating Manual Page 4
3.1 Maximum Airspeed display
This display can be accessed by pressing the F2/Down button during the normal display
mode Press the F1/Up button when the max values display is showing to reset the
maximum values to the current airspeed
3.2 Start / Stop flight display
Press the F1/Up button during the normal display mode
to manually start/stop a flight This key is only active if
the ASV-1 is setup to select the manual flight option
under the “TIMERS” setup menu
Note: The maximum airspeed is stored in non-volatile
memory and is recalled on power-up.
Vega ASV-1 Operating Manual Page 5
4 Menu System
Press the rotary control button during the normal display mode to enter the menu system Use the rotary control to
navigate through the menu system
4.1 Exiting the menu system
Press the F1/Up button to exit the menu system when the “EXIT” soft key is shown All changes made during navigation
of the menu system will be saved in non-volatile memory upon exiting The instrument will not save any changes if you
remove power before exiting the menu system
4.2 ALT Setup (Altitude Setup)
Vega ASV-1 Operating Manual Page 6
Altitude Unit:
Select if you want the altitude displayed in ft (feet) or m (meters)
Pressure Unit:
Select if you want the local pressure displayed in mB (millibars) or “Hg (inches of mercury)
Resolution:
Select the resolution of the altitude value, a selection of 1,10,25 or 100 ft or m can be selected
Position:
Select whether you want the altitude display on the top or on the bottom of the main display
Cal:
On the rear of your ASV-1 instrument you will find the calibration factor that has been determined to ensure the most
accurate reading of your altimeter This is the value that should be entered here Should you have access to an accurate
reference you may use this function to calibrate your altimeter Before you do this, ensure that your calibrated and
certified reference is set to the local pressure of 1013 25mB (29 92”HG) Your altimeter has been calibrated by the factory
to an accuracy of +/- one mB or approximately +/- 30 ft (10m) at sea level
Serial Out:
Select “ON” to enable the RS232 serial altitude output This formatted serial RS232 message can be directly interfaced to
various RS232 serial input transponders If a parallel Gillham output is required then a CNV-ALT can be purchased from
your MGL Avionics distributor to convert the RS232 output to a parallel Gillham output
Prot:
Select the protocol of the serial RS232 output message The protocol can be selected between GARMIN AT, Magellan,
Northstar / Garmin, Trimble / Garmin, MGL Avionics and Microair UAV Please note that the baud rate is automatically
adjusted according to which protocol is selected The output format is as follows The message contains the current
pressure altitude with a fixed reference to 1013 25mB (29 92 inches mercury) All protocols use 8 databits, no parity, and
1 stop bit The message is outputted once a second
Protocol Baud
Rate
Message format Example
Garmin AT 1200 #AL, space, +/-, five altitude digits right
justified zero padded, T+25, checksum,
carriage return
The checksum is a simple modulo 256 sum
of the binary values of the individual
characters The checksum is sent as two
characters in hexadecimal format
#AL +02372T+25DF[CR]
Magellan 1200 #MGL, +/-, five altitude digits right justified
zero padded, T+25, checksum, carriage
return
The checksum is a simple modulo 256 sum
of the binary values of the individual
characters The checksum is sent as two
characters in hexadecimal format
$MGL+02372T+2513[CR]
Northstar,
Garmin
4800 ALT, space, five altitude digits right justified
zero padded, carriage return
ALT 02372[CR]
Trimble,
Garmin
9600 ALT, space, five altitude digits right justified
zero padded, carriage return
ALT 02372[CR]
MGL Avionics 9600 ALT, +/-, five altitude digits right justified
zero padded ,1013 25mB (29 92”Hg)
referenced, C, +/-, five altitude digits right
justified zero padded (corrected to local
pressure), L, local pressure setting in
ALT+02372C+02372L1013+0000XCA[
CR]
Vega ASV-1 Operating Manual Page 7
millibars,+/-, four digit VSI reading right
justified zero padded in ft/min, X,
checksum, carriage return
The checksum is a simple modulo 256 sum
of the binary values of the individual
characters The checksum is sent as two
characters in hexadecimal format
Microair UAV 9600 STX,a,=, five altitude digits right justified
zero padded, ETX
[STX]a=02372[ETX]
STX=0x02
ETX=0x03
CR=0x0D
Test Alt Encoder:
This is a handy function to test the ASV-1 transponder interface once the installation has been completed The serial
output will output specific altitudes which can then can be used to test the serial RS232 output and the parallel gillham
output if using a CNV-ALT converter The ASV-1 will resume the normal output of the indicated altitude upon exiting the
test function
The following codes are outputted:
Altitude D4 A1 A2 A4 B1 B2 B4 C1 C2 C4
-1000ft 0 0 0 0 0 0 0 0 1 0
-900ft 0 0 0 0 0 0 0 1 1 0
-700ft 0 0 0 0 0 0 1 1 0 0
-400ft 0 0 0 0 0 0 1 0 1 1
-200ft 0 0 0 0 0 1 1 0 0 1
800ft 0 0 0 0 1 1 0 0 0 1
2800ft 0 0 0 1 1 0 0 0 0 1
6800ft 0 0 1 1 0 0 0 0 0 1
14800ft 0 1 1 0 0 0 0 0 0 1
30800ft 1 1 0 0 0 0 0 0 0 1
Each altitude reporting code line must be tested for integrity of connection if at any time the aircraft connections to the
transponder or altitude data source have been removed and reconnected Integrity of the connections may be verified by
performing a test of mode C function of the transponder system
Warning: Do not use this function while in flight as incorrect altitude information will be sent to
the transponder
Vega ASV-1 Operating Manual Page 8
4.3 VSI Setup (Vertical Speed Indicator Setup)
VSI Display:
Select if you want the VSI display to be shown on the altitude “TAPE” display The VSI display is always shown on the
altitude “CLASSIC” display
VSI Unit:
Select if you want the VSI to be displayed in "ft/min" (feet/minute) or "m/s" (meters/second)
Scale:
Select the VSI scale most suited for your aircraft
VSI Cal:
This is a function that is used to calibrate your VSI to read exact rates of climb or decent This function works as a
percentage of initial reading The default setting for this function is 100% Increasing this value increases the VSI reading
and decreasing the value decreases the reading
Suggested VSI calibration method
After you have installed the instrument, perform a calibration flight This should be done in very calm conditions
Turbulence and thermal activity will make accurate calibration impossible Many areas have ideal conditions during early
mornings or late afternoons Place the instrument in ft/min for ease of calibration Take your aircraft to a few
thousand feet above ground and start a glide with a low power setting Take a stopwatch and when the glide is stable
(stable VSI reading) start the stopwatch Take note of your altimeter reading at the same time Continue the stable glide
for one minute exactly After the minute has finished, take another reading of your altimeter
Example:
VSI reading during stable glide: -400 ft/min
Start altitude: 2500 ft
End altitude: 2050 ft
In the above example the VSI is under reading by about 12% Set your VSI calibration to 112% to cancel out the error
Vega ASV-1 Operating Manual Page 9
4.4 ASI Setup (Airspeed Setup)
Zero ASI Sensor:
This setup allows your instrument to measure the zero airspeed reading of the airspeed sensor and set a calibration value
internally for this This is equivalent to some mechanical airspeed indicators that have an adjustment to set the needle to
zero when the aircraft is not moving You would use this function occasionally if you see an airspeed reading when the
aircraft is at rest This may be caused by aging of the built in pressure sensor or related electronics When this function is
performed make sure that there is no air flow into the pitot tube as this would result in an incorrect internal calibration
ASI Unit:
Select if you want the ASI to be displayed in mph (statute miles per hour), km/h (kilometers per hour) or kts (nautical miles
per hour)
ASI Filter:
This function can be used to select the signal filter time constant Selections are "NONE", “FAST” or “SLOW” This
selection influences the rate at which your ASI can change its reading If you have an installation that suffers from strong
turbulence at the pitot tube, select “slow” If you have a very clean airflow in front of the pilot tube you can select “fast”
which will give you a faster response to airspeed changes
Vega ASV-1 Operating Manual Page 1
Vne Speed: ( ax Exceed Speed)
Enter you maximum speed you aircraft should not exceed
Vno Speed: ( ax aneuvering Speed)
Enter your maximum maneuvering speed
Vfe Speed: ( ax Flap Speed)
Enter the maximum speed that is permissible with the flaps extended
Vs1 Speed: ( in Safe Speed, Normal)
Enter your minimum safe speed for normal flight of your aircraft
Vs0 Speed: ( in Safe Speed, Landing)
Enter your minimum safe speed for landing your aircraft
Vs Alarm:
This enables or disables Vs Alarm
Vne Alarm:
This enables or disables the VNE alarm
Cal:
During the factory calibration a factor has been determined and entered here that will give you accurate airspeed,
provided your pitot tube is not influenced by pressure effects caused by airflow around your airframe The calibration is
displayed in % of the reading, you can increase or decrease the reading if required to help cancel out under or over
reading of the airspeed indicator on your aircraft The original calibration factor has been written onto the back of your
instrument
Position:
Select whether you want the airspeed display on the top or on the bottom of the main display
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1
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