Vega ALT-5 Manuale utente

Introduction

The ALT-5 is a 2 1/4” (57mm) sunlight readable encoding altimeter and a wide range ertical speed indicator.

The altimeter contains an internal high accuracy 24 bit digital altitude sensor which calculates altitude from -1500 ft up to

a maximum of +35000 ft. The ALT-5 outputs arious 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.

The ALT-5 also features a user settable altitude bug and an encoder test function. The ALT-5 pro ides a parallel Gillham

code interface when used in conjunction with the MGL A ionics CNV-ALT.

1 Features

•Large 1.8” high resolution 160x128, wide viewing angle, sunlight readable, 1000 cd/m2 color LC display

• An internal high accuracy 24 bit digital altitude sensor calculates altitude from –1500 ft up to a maximum

of 35000 ft (-457m to 10668m)

• The ALT-5 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 /-20 ft/min to as high as /-10000 ft/min

• VSI units can be in feet/minute (ft/min) or in meters/second (m/s)

• User settable altitude bug

• Standard 2 1/4” (57mm) 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 30V DC

• 1 year limited warranty

Vega ALT-5

Altimeter and Vertical Speed Indicator

with a transponder compatible serial

RS232 output

Operating Manual – English 1.06

Vega ALT-5 Operating Manual Page 2

2 Layout

3 Main Displays

The ALT-5 has 2 different display screens. The main display screen can be selected in the “ALT SETUP” menu.

3.1 Altitude "TAPE" Display

F2 / Down Button:

Menu system: Softkey button

Normal display: Altitude

bug setting 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: Enable/disable

altitude bug

2 1/4” (57mm) enclosure.

Can be front or rear mounted

VSI scale indication

VS I (Vertical Speed Indication)

VSI unit

Altitude Tape

Altitude Value

Altitude Bug

Local pressure readout (Either in mB or in “HG)

VSI Value

Altitude unit

Vega ALT-5 Operating Manual Page 3

3.2 Altitude "CLASSIC" Display

3.3 Altitude Bug

Press the F2/Down button during the altitude “TAPE” display to access the altitude bug setting screen. Press the F1/UP

key to set the altitude bug to the current altitude or use the rotary control to adjust the altitude bug. Press the F2/Down

key to change the increment / decrement unit to 50 or 500. Press the rotary control to exit and sa e.

Press the F1/Up button during the normal altitude “TAPE” display to enable or disable the altitude bug. The bug will be

yellow when in the display screen and cyan when either abo e or below the limits of the display.

VSI Value

VSI unit

Altitude unit

Altitude Value

VSI scale indication

VSI (Vertical Speed Indication)

Local pressure readout (Either in mB or in “HG)

Vega ALT-5 Operating Manual Page 4

4 Menu System

Press the rotary control button during the normal display mode to enter the menu system. Use the rotary control to

na igate 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 na igation

of the menu system will be sa ed in non- olatile memory upon exiting. The instrument will not sa e any changes if you

remo e power before exiting the menu system.

Vega ALT-5 Operating Manual Page 5

4.2 ALT Setup (Altitude Setup)

Style:

Select the altitude display screen. Options include “TAPE” or “CLASSIC”.

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 alue, a selection of 1,10,25 or 100 ft or m can be selected.

ALT Calibrate

This section allows for the calibration and fine tweaking of the altitude alue. Before you begin, ensure that your calibrated

and certified reference is set to the local pressure of 1013.25mB (29.92”Hg). The ALT-5 altitude alue in ft (referenced to

1013.25mB (29.92”Hg)) is displayed in the top right hand corner of the display. All calibration must be done in feet.

The combined adjustments cater for both the altitude sensors offset and gain. Only start the calibration sequence once

the instrument has been running for a minimum of 10 minutes.

Start the altitude calibration with the “CAL FACTOR” and make sure the “CAL GAIN” alue is set to 100.00%.

Vega ALT-5 Operating Manual Page 6

Cal Factor:

On the rear of your ALT-5 instrument you will find the calibration factor that has been determined to ensure the most

accurate reading of your altimeter. This is the pressure sensor offset in 0.1mB increments. Adjust your static pressure to

be close to sea le el pressure. The exact altitude is not important and can be up to se eral hundred feet. Adjust the

calibration factor so the altitude readout in the top right hand corner of the display agrees with your pitot static test set.

Cal Gain:

Once you are satisfied that the low le el altitude “CAL FACTOR” is correct, apply a static pressure that will result in an

altitude between 20000 and 30000 ft. Adjust the “CAL GAIN” until the altitude readout in the top right hand corner of the

display agrees with your pitot static test set

NOTE: Adjusting the “CAL GAIN” also changes the low le el altitude calibration achie ed when adjusting the “CAL

FACTOR”. Please recheck your low le el altitude calibration and adjust if necessary. Recheck your altitude readout at the

higher altitude, and if needed slightly adjust the “CAL GAIN” again. Repeat the process until you are satisfied with both

the “CAL FACTOR” altitude and the “CAL GAIN” altitude.

Serial Out:

Select “ON” to enable the RS232 serial altitude output. This formatted serial RS232 message can be directly interfaced to

arious RS232 serial input transponders. If a parallel Gillham output is required then a CNV-ALT can be purchased from

your MGL A ionics distributor to con ert 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 A ionics 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, +/-, fi e altitude digits right

justified zero padded, T+25, checksum,

carriage return

The checksum is a simple modulo 256 sum

of the binary alues of the indi idual

characters. The checksum is sent as two

characters in hexadecimal format

#AL +02372T+25DF[CR]

Magellan 1200 #MGL, +/-, fi e altitude digits right justified

zero padded, T+25, checksum, carriage

return

The checksum is a simple modulo 256 sum

of the binary alues of the indi idual

characters. The checksum is sent as two

characters in hexadecimal format

$MGL+02372T+2513[CR]

Northstar,

Garmin

4800 ALT, space, fi e altitude digits right justified

zero padded, carriage return

ALT 02372[CR]

Trimble,

Garmin

GTX327,

GTX328,

GTX330

(Set on Icarus)

9600 ALT, space, fi e altitude digits right justified

zero padded, carriage return

ALT 02372[CR]

MGL A ionics 9600 ALT, +/-, fi e altitude digits right justified

zero padded ,1013.25mB (29.92”Hg)

referenced, C, +/-, fi e altitude digits right

ALT+02372C+02372L1013+0000XCA[

CR]

Vega ALT-5 Operating Manual Page 7

justified zero padded (corrected to local

pressure), L, local pressure setting in

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 alues of the indi idual

characters. The checksum is sent as two

characters in hexadecimal format

Microair UAV 9600 STX,a,=, fi e altitude digits right justified

zero padded, ETX

[STX]a=02372[ETX]

Infiniteq 57600 See Infiniteq protocol format below

STX=0x02

ETX=0x03

CR=0x0D

Infiniteq protocol format:

STX, Address, Message type, Length, Data payload, Checksum, ETX

STX: Start of text (0x02)

Address: unsigned char (8bit), (0x01)

Message Type: unsigned char (8bit), (0x05)

Length: unsigned char (8bit), Length of the data payload (does not include the STX, Address, message type, checksum or

ETX), (0x06)

Data payload:

Altitude: Signed Long (32 bit), Altitude in feet (Referenced to 1013.25mB)

Vertical Speed: Signed Int (16 bit), Vertical Speed in ft/min

Checksum: unsigned char (8bit), XOR of all bytes starting from the unit address to the end of the data payload. The

checksum is seeded with 0xa5. (does not include the STX or ETX)

ETX: End of text (0x03)

Vega ALT-5 Operating Manual Page 8

Test Alt Encoder:

This is a handy function to test the ALT-5 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 con erter. The ALT-5 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 ha e been remo ed and reconnected. Integrity of the connections may be erified 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 ALT-5 Operating Manual Page 9

4.3 VSI Setup (Vertical Speed Indicator Setup)

VSI Dis lay:

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 alue increases the VSI reading

and decreasing the alue decreases the reading.

Suggested VSI calibration method

After you ha e installed the instrument, perform a calibration flight. This should be done in ery calm conditions.

Turbulence and thermal acti ity will make accurate calibration impossible. Many areas ha e 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 abo e 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 abo e example the VSI is under reading by about 12%. Set your VSI calibration to 112% to cancel out the error.

Vega ALT-5 Operating Manual Page 10

4.4 MISC Setup (Miscellaneous Setup)

Backlight:

Select this menu option to adjust the backlight brightness.

Security Setu :

Select this menu option if you want to password protect the menu system.

Information:

This menu option displays information about the unit.

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