MGL Avionics Blaze ASV-2 User manual

Introduction
The ASV-2 is a 3 1/8” sunlight readable encoding altimeter, airspeed and wide range ertical 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-2 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.
Airspeed is based on the pressure generated by a pitot tube system and a static port is pro ided as well for use by high
speed aircraft. The ASV-2 instrument measures airspeed from 16mph to 250mph and is well suited to slower aircraft due
to ery good sensiti ity 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-2 also pro ides a programmable Vs and Vne
airspeed alarm output. ASI sensiti ity can be calibrated by the user to cater for errors caused by pitot tube placement.
In addition, the ASV-2 pro ides an encoder test function, flight timer since takeoff and records the maximum airspeed
reached. The ASV-2 pro ides a parallel Gillham code interface when used in conjunction with the MGL A ionics CNV-
ALT.
Blaze ASV-2
Altimeter, Airspeed (ASI) and Vertical
Speed Indicator (VSI)
Operating Manual – Englis 1.00

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1 Features
•Large 2.6” high resolution 320x240, IPS (fully viewa le in all directions), sunlight reada le color LCD
display
• An internal ig accuracy 24 bit digital altitude sensor calculates altitude from –1000 ft up to a maximum
of 35000 ft (-304m to 10668m)
• T e ASV-2 outputs various formatted RS232 serial data protocols compatible wit serial input
transponders suc as t at from Garmin, Magellan, Nort star, Trimble, Microair etc.
• Provides a parallel Gill am code interface for transponders w en used in combination wit t e MGL
Avionics CNV-ALT
• Built in encoder test function
• T e altimeter can display altitude in feet or meters
• Local pressure can be set in millibars or inc es of mercury
• Contains a wide range VSI indicator from +/-20 ft/min to as ig as +/-10000 ft/min
• VSI units can be in feet/minute (ft/min) or in meters/second (m/s)
• Measures airspeed from 16mp to 250mp and is well suited to slow aircraft due to very good sensitivity
and linearity at low air speeds
• Includes a flig t timer since takeoff
• Airspeed units can be set to miles per our (mp ), kilometer per our (km/ ) or nautical miles per our
(kts)
• Contains a programmable Vs and Vne airspeed alarm output
• Records maximum airspeed reac ed in permanent memory
• Standard 3 1/8” aircraft enclosure (can be front or rear mounted)
• T e LED backlig t can automatically adjust to t e ambient lig t, or it can be manually adjusted in t e
menu system
• Rotary control plus 2 independent buttons for easy menu navigation and user input
• Wide input supply voltage range of 8 to 30V DC wit built in voltage reversal and over voltage protection
for ars electrical environments
• 1 year limited warranty

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2 Layout
3 Main Display
F2 / Down Button:
Menu system: Softkey button
Normal display: Press to iew the
Timers and Max Values display
Sunlig t readable color grap ic display:
The backlight can automatically adjust
to the ambient light or it can be manually
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)
3 1/8” enclosure.
Can be front or rear mounted
VSI scale indication
VS I (Vertical Speed Indication)
VSI unit
Altitude alue
Local pressure readout (Either in mB or in “HG)
VSI alue
Altitude unit
Airspeed unit
Airspeed alue
Ambient light sensor

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3.1 Start / Stop flig t display
Press the F1/Up button during the normal display mode
to manually start/stop a flight. This key is only acti e if
the ASV-2 is setup to select the manual flight option
under the “TIMERS” setup menu.
3.2 Timers display
This display can be accessed by pressing the F2/Down button during the normal display
mode.
3.3 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 alues display is showing to reset the
maximum alues to the current airspeed.
Note: T e maximum airspeed is stored in non-volatile
memory and is recalled on power-up.

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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 t e 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.
4.2 ALT Setup (Altitude Setup)

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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.
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-2 instrument you will find the calibration factor that has been determined to ensure the most
accurate reading of your altimeter. This is the alue that should be entered here. Should you ha e 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 le el.
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
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
justified zero padded (corrected to local
pressure), L, local pressure setting in
ALT+02372C+02372L1013+0000XCA[
CR]

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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]
STX=0x02
ETX=0x03
CR=0x0D
Test Alt Encoder:
This is a handy function to test the ASV-2 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 ASV-2 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.

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4.3 VSI Setup (Vertical Speed Indicator Setup)
VSI Display:
Select if you want the VSI to be displayed.
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 met od
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.

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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 alue
internally for this. This is equi alent to some mechanical airspeed indicators that ha e an adjustment to set the needle to
zero when the aircraft is not mo ing. 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 ha e an installation that suffers from strong
turbulence at the pitot tube, select “slow”. If you ha e a ery clean airflow in front of the pilot tube you can select “fast”
which will gi e you a faster response to airspeed changes.

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Vne Speed: ( ax Exceed Speed)
Enter you maximum speed you aircraft should not exceed.
Vno Speed: ( ax aneuvering Speed)
Enter your maximum maneu ering 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 gi e you accurate airspeed,
pro ided 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 o er
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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4.5 Timers Setup
FLIGHT:
Select whether you want the ASV-2 to automatically detect a flight or whether the pilot must press the F1/Up button to
start/stop a flight. We recommend you select automatic flight detection.
T/O AIRSPEED:
This menu option is only shown if the “DETECT” flight mode is selected. Enter the takeoff airspeed threshold that you
want the flight timer to start incrementing.

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4.6 MISC Setup (Miscellaneous Setup)
Backlight:
Select manual or automatic backlight control.
Use the rotary control in manual mode to adjust the backlight brightness.
Allow 3 seconds for the display to adjust to the ambient lighting conditions when using
the automatic backlight mode. The display will set the backlight to the dim setting if the
ambient light is less then the threshold setting, alternati ely the display will set the
backlight to the bright setting if the ambient light is greater then the threshold setting. The
ambient light recei ed is shown as the ADC alue in the top header. Use this alue to set
the threshold alue.
Security Setup:
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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Default Settings:
Select this menu option to reset all the settings to factory defaults.
4.7 ADC Values
This menu displays the ADC alue that ha e been read from the pressure sensor.
5 Loading factory default settings
Press and hold the F1/Up button and rotary control during power up to load the pre-
programmed factory default settings. The following screen will be displayed:
Factory default settings can also be loaded in the Miscellaneous setup menu.

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6 Error Messages
Unit settings CRC error. Load default settings to restore to factory defaults. If the error
message still persists then it could possibly be a non- olatile memory failure in which
case the instrument will then ha e to be returned to the factory.
Calibration constants CRC error. The instrument could possibly ha e a non- olatile
memory failure in which case the instrument will then ha e to be returned to the factory.
Internal flash CRC error. The instrument does a firmware check on the program when
power is applied to the instrument . If the program is corrupt in any way then the internal
flash CRC error will be displayed. Reload the instruments firmware and load default
settings. If the error message still persists then it could possibly be an internal flash
memory failure in which case the instrument will then ha e to be returned to the factory.
Max Values CRC error. Load default settings to restore to factory defaults. If the error
message still persists then it could possibly be a non- olatile memory failure in which
case the instrument will then ha e to be returned to the factory.
Altitude sensor error. The instrument could ha e a faulty altitude sensor in which case
the instrument will then ha e to be returned to the factory.

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7 Specifications
Operating Temperature Range -10ºC to 60ºC (14ºF to 140ºF)
Storage Temperature Range -20ºC to 80ºC (-4ºF to 176ºF)
Humidity <85% non-condensing
Power Supply 8 to 30Vdc SMPS (switch mode power supply) with built in 33V o er
oltage and re erse oltage protection
Current Consumption Approx. 125mA @ 12V (backlight highest setting), 50mA @12V (backlight
lowest setting)
Display
2.6” 320x240 IPS color LCD display
Minimum 600cd/m2 brightness
Sunlight readable with anti-glare coating
LED Backlight can be set to automatic or can be manually adjusted
Alarm Output Open collector transistor switch to ground
Maximum rating 0.25A
Altitude sensor ADC resolution 24 bit
Dimensions see Blaze series dimensional drawing
Enclosure 3 1/8” ABS, black in color, front or rear mounting. Flame retardant.
Weig t Approx. 160 grams (Instrument excluding cables)
Non-volatile memory storage 100000 write cycles
Altimeter range -1000ft to 35 000ft (-304m to 10668m)
Altitude units ft or m
Pressure units InHG or mB
VSI range +-20ft/min to +-10000ft/min
VSI units ft/min or m/s
Airspeed ADC resolution 12 bit
Airspeed range 16mph to 250mph
Airspeed resolution 1 mph
Measurement accuracy +/-1% at 85mph nominal
Serial Port RS232 oltage le els
8 Operating t e alarms
The alarm output can be used to switch an external alarm indicator. The external alarm switch is an open collector
transistor switch to ground with a maximum rating of 0.25A DC. It is possible to wire the alarm contacts of se eral
Stratomaster instruments in parallel should this be desired. To a oid false acti ation of the alarms, the alarm function is
only acti e 10 seconds after the instrument has powered up.
9 Firmware Upgrading
The ASV-2 can be upgraded in the field by connecting the RS232 port to a PC and running the firmware update program.
Note t at only t e RS232 port can be used to upgrade t e firmware.
Please see t e Blaze firmware upgrading document for more information.

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10 Installation
Connect a pitot tube to the “pressure port” and if required connect the static port.
Connect the static port to a suitable static air pressure line. If you ha e a slow aircraft or an aircraft where the internal
cabin pressure does not change during flight and is equi alent to the outside air pressure you may find that it is not
required to connect a static port. Most small aircraft such as ultralights or microlights do not require a connection to a
static port. In these cases, simply lea e the static port open. Ensure howe er that the static port does not recei e
pressurized air due to the forward mo ement of the aircraft. Be especially critical of your pod or panel if you do not use a
static port. Any build up of a pressure differential due to ram air or suction can lead to large errors of the indicated
airspeed and altitude. Static ports are usually mounted at a strategic position on the rear side of the aircraft fuselage for
faster, pressurized aircraft.
The ASV-2 pressure ports take 4mm ID tubing. Use hose clamps to fasten the hose onto the ASV-2 pitot and static ports.
The ASV-2 allows you to calibrate the airspeed reading. This is done under the “AIRSPEED SETUP” menu item. The
main reason for this is to be able to remo e errors introduced due to the airflow around your aircraft which may ha e an
effect on your pitot tube pressure.
10.1 Connection Diagram
The use of an external 1A fuse is recommended. Connect the supply terminals to your aircrafts power supply. The ASV-2
can be used on both 12V and 24V without the use of any pre-regulators. Ensure that the supply oltage will not drop
below 8V during operation as this may result in incorrect readings.

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10.2 Pressure Port Dimensions
10.3 Cable connections
Main connector (D15 connector: Unit Female, Cable Male)
11 Cleaning
The unit should not be cleaned with any abrasi e substances. The screen is ery sensiti e to certain cleaning materials
and should only be cleaned using a clean, damp cloth.
D15 Pin Color Function
1 Red 8-30Vdc power via power switc / circuit
breaker and fuse.
2 Black Ground.
3 W ite/Blue
Stripe
RS232 Transmit data (Firmware upgrading /
RS232 Altitude output)
4 - RS232 Receive data (Firmware upgrading)
15 W ite Alarm Output (Open collector)
Warning: The ASV-2 is not waterproof, serious damage could occur if the unit is exposed to
water and/or spray jets.
Inc es Millimeters
Min Max Min Max
A0.248 0.278 6.30 7.06
B0.420 0.440 10.67 11.18
C0.182 0.194 4.62 4.93
D0.310 0.330 7.87 8.38

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12 Warranty
This product carries a warranty for a period of one year from date of purchase against faulty workmanship or defecti e
materials, pro ided there is no e idence that the unit has been mishandled or misused. Warranty is limited to the
replacement of faulty components and includes the cost of labor. Shipping costs are for the account of the purchaser.
Damage as a result of applying excessive pressure to t e static pressure port are excluded from warranty.
13 Disclaimer
Operation of this instrument is the sole responsibility of the purchaser of the unit. The user must make themsel es familiar
with the operation of this instrument and the effect of any possible failure or malfunction.
This instrument is not certified by the FAA. Fitting of this instrument to certified aircraft is subject to the rules and
conditions pertaining to such in your country. Please check with your local a iation authorities if in doubt. This instrument
is intended for ultralight, microlight, homebuilt and experimental aircraft. Operation of this instrument is the sole
responsibility of the pilot in command (PIC) of the aircraft. This person must be proficient and carry a alid and rele ant
pilot’s license. This person has to make themsel es familiar with the operation of this instrument and the effect of any
possible failure or malfunction. Under no circumstances does the manufacturer condone usage of this instrument for IFR
flights.
IMPORTANT NOTICE:
You must make your own determination if the products sold by MGL A ionics are safe and effecti e for your intended
applications. MGL A ionics makes no representations or warranties as to either the suitability of any of the products we
sell as to your particular application or the compatibility of any of the products we sell with other products you may buy
from us or anywhere else, and we disclaim any warranties or representations that may otherwise arise by law. Also, we
offer no specific ad ice on how to install any of the products we sell other than passing along anything that may ha e
been pro ided to us by the manufacturer or other issues. If you are in need of further information or guidance, please turn
to the manufacturer, FAA Ad isory Circulars and guidance materials, the Experimental Aircraft Association, or other
reputable sources.
Note: Product warranty excludes damages caused by unprotected, unsuitable or incorrectly wired
electrical supplies and or sensors, and damage caused by inducti e loads.
The manufacturer reser es the right to alter any specification without notice.

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Ot er instruments in t e Stratomaster Blaze series
AHRS-2 Artificial Horizon and Magnetic Compass Indicator
ALT-6 Altimeter and Vertical Speed Indicator (VSI)
ALT-7 Altimeter and Vertical Speed Indicator (VSI) with a transponder compatible RS232 &
parallel Gillham code output
ASI-5 Airspeed Indicator (ASI)
ASV-2 Altimeter, Airspeed (ASI) and Vertical Speed Indicator (VSI)
EMS-2 Engine Monitoring System
FF-5 Fuel Computer
FLIGHT-3 Primary Flight Instrument
INFO-2 Information Display (G-Force meter, UTC and Local Time, Slip Indicator, Outside Air
Temperature (OAT), Battery Voltage, Current and charge display, Flight Timer & Flight
Log, Stopwatch, Countdown Timer and Alarm)
MAG-2 Magnetic Compass Indicator
MAP-4 Manifold Pressure and RPM Indicator
RPM-2 Uni ersal Engine / Rotor RPM Indicator
TC-5 4 Channel Thermocouple (EGT/CHT) Indicator
TC-6 12 Channel Thermocouple (EGT/CHT) Indicator
TP-4 4 Channel Uni ersal Analog Input (Pressure/Temperature/Current/Volts) Indicator