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MGL Avionics ASX-1 Operating Manual

Encoding aviation altimeter with serial output and airspeed indicator (asi)
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Introduction
The ASX-1 altimeter/airspeed combo is a 2 1/4" instrument based on a precision altimeter and a wide range, sensitive
airspeed indicator. The altimeter conforms to ANSI standard atmosphere rules from –700 ft up to a maximum of 30 000 ft.
The altimeter includes an encoding serial output that, when used in combination with MGL Avionics CNV-AT, provides a
parallel Gillham code interface for transponders. The altimeter can display altitude in feet or meters. Local pressure can
be set in millibars or inches of Mercury.
The airspeed indicator can show air speeds from 16 to 250 mph and is well suited for use in slow aircraft due to very good
sensitivity and linearity at low air speeds. The airspeed indicator as well as altimeter can interface to a static port and the
airspeed indicator is based on a standard aviation pitot tube. The airspeed indicator can be set to indicate speeds in
statute miles per hour (mph), kilometers per hour (km/h) or nautical miles per hour (knots) with the air-distance being
displayed in corresponding units. The airspeed sensitivity can be calibrated by the user to cater for errors caused by pitot
tube placement. The ASX-1 also outputs airspeed information via the airtalk protocol for interfacing to the Infinity FF-1 /
Velocity FF-3 (fuel flow computer for single or dual fuel tanks) and the SP-X (AHRS) instruments.
In addition the ASX-1 provides a 24 entry automatic flight log that stores the duration of each of the last 24 flights, an air-
distance trip counter and a current flight timer. The ASX-1 is the ideal instrument for installations where panel space is
limited.
1 Features
•
Precision altimeter from –700 ft up to a maximum of 30 000 ft (-213m to 9144m)
•
Provides a parallel Gillham code interface for transponders when used in combination with the MGL
Avionics CNV-AT
•
The altimeter can display altitude in feet or meters. Local pressure can be set in millibars or inches of
Mercury
•
Airspeed ranges from 16 to 250mph and is well suited to slow aircraft due to very good sensitivity and
linearity at low air speeds. Airspeed can be displayed as IAS or a calculation based TAS
•
Includes a 24 entry automatic flight log
•
Includes an air-distance trip counter and a flight timer
•
Airspeed units can be in miles per hour (mph), kilometer per hour (km/h) or nautical miles per hour (knots)
•
Contains a programmable low/high airspeed alarm
•
Records maximum airspeed and altitude 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
•
Alarm output as well as a red LED illuminates when the alarm has been activated
•
Large backlit graphic LCD with adjustable contrast
•
Wide input supply voltage range of 8 to 30V DC with built in voltage reversal and over voltage protection
for harsh electrical environments
•
Light weight design
•
Field upgradeable firmware
•
1 year limited warranty
ASX-1
Encoding aviation altimeter with
serial output and airspeed Indicator
(ASI)
Operating Manual – English 1.05

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Summary of Contents for MGL Avionics ASX-1

  • Page 1 Velocity FF-3 (fuel flow computer for single or dual fuel tanks) and the SP-X (AHRS) instruments. In addition the ASX-1 provides a 24 entry automatic flight log that stores the duration of each of the last 24 flights, an air- distance trip counter and a current flight timer.

  • Page 2: Main Display

    ASX-1 Operating Manual Page 2 2 ASX-1 Layout LED Alarm: The red LED will illuminate if the airspeed alarm set points has been exceeded Backlit Graphic LCD Display: Contrast and backlight can be adjusted in the menu system Pressure Ports:...

  • Page 3: Menu System

    3.1 Start/Stop Flight display Press the F1 key during the normal display mode to manually start/stop a flight. This key is only active if the ASX-1 is setup to select the manual flight option under the log book setup menu.

  • Page 4: Maximum Values

    4.1 Exit Menu Pressing the rotary control on this menu item will cause the ASX-1 to exit the menu system. All changes made during navigation of menu system will be saved in non-volatile memory on exiting the menu system.

  • Page 5: Display Setup

    Select if you would like the hour to be displayed in decimal fractions (0-99) or minutes (0-59). This setting influences the current flight time display and the flight log. Select whether you want the ASX-1 to automatically detect a flight or whether the pilot must press the F1 key to start/stop a flight.
  • Page 6 ASX-1 Operating Manual Page 6 4.5 Altitude Setup Move the highlight over this menu item and press the rotary button to return to the main menu. Select if you want your altitude readout in feet (ft) or meters (m). Select if you want your local pressure readout in millibars (mB) or inches of Mercury (“Hg).
  • Page 7 ASX-1 Operating Manual Page 7 Enter the low airspeed set-point for when the alarm must activate. Any speed below this value will activate the alarm. Select whether you want the low air speed alarm to be turned on or off. The low airspeed alarm is only activated once a flight has started.

  • Page 8: Altitude Encoder

    To use the ASX-1 as an encoding altimeter an Airtalk to parallel Gillham code output encoder such as the MGL Avionics CNV-AT must be used. This converter takes the Airtalk serial string that is outputted by the ASX-1 and converts it to a parallel Gillham code suitable for aircraft transponders.

  • Page 9: Loading Factory Default Settings

    ASX-1 Operating Manual Page 9 7 Loading factory default settings Pressing and holding the F1 and F2 simultaneously on power up will cause the ASX-1 to load preprogrammed factory default settings. The following screen will be displayed: 8 Operating the alarms If the alarm is activated, the corresponding item on the display will flash.

  • Page 10: Installation

    In this case you would need to obtain aircraft grade tubing of suitable diameter. You would also have to use hose clamps to fasten the hose onto the ASX-1 pitot and static ports. The ASX-1 allows you to calibrate the airspeed reading.

  • Page 11: Connection Diagram

    ASX-1 Operating Manual Page 11 11.2 Connection Diagram Connect static port to suitable static line on the aircraft. Note: Leaving this port unconnected may lead to airspeed and altitude errors as cabin pressure changes due to airflow or other factors. Connect the pressure port to a pitot tube. The location of the pitot tube should be chosen so it is exposed to clean, undisturbed airflow at the same speed as the aircraft if flying.

  • Page 12: Warranty

    ASX-1 Operating Manual Page 12 12 Warranty This product carries a warranty for a period of one year from date of purchase against faulty workmanship or defective materials, provided there is no evidence that the unit has been mishandled or misused. Warranty is limited to the replacement of faulty components and includes the cost of labour.

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