MicroAir Avionics T2000SFL User manual

Microair Avionics Pty Ltd
Airport Drive
Bundaberg
Queensland 4670
Australia
Tel: [phone]
Fax: [phone]
e-mail: [email protected]

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About This Document
Microair Avionics has developed a series of transponders for use with
OEM applications, and for commercial sale by Microair Avionics. The
manual explains the basic functions and elaborates on the more
sophisticated features, such as altitude display and alerts.
Microair reserves the right to amend this manual as required, to reflect
any enhancements or upgrades to the T2000SFL transponder series.
© Microair Avionics Pty Ltd
Statement:
The T2000SFL owner accepts all responsibility for obtaining the proper licensing before using the transponder. The
coverage you can expect from the T2000SFL is limited to “line of sight”. Low altitude or aircraft antenna shielding by the
aircraft itself may result in a reduced range. Range can be improved by climbing to a higher altitude. It may be possible to
minimize antenna shielding by locating the antenna where dead spots are only noticed during abnormal flight attitudes.
The T2000SFL should be turned off before starting or shutting down aircraft engine(s).
Mobile phones must not be turned on during the operation of the T2000SFL.
T2000SFL-01 (8)
1-6-9 software
REVISION STATUS
Revision Date Change
1.0 11/02/01 Initial Draft
2.2 11/07/01 Voltage Monitoring
2.3 22/08/01 Standby function added
2.4 05/10/01 Hi / Lo alerts added
2.5 12/10/01 Mode and Program Mode menu functions amended
2.6 07/11/01 Deleted SF references
2.7 01/06/02 Assigned Alt & Buffer Alt input amended, Name/Reg relocated to end of Program Mode
2.8 22/11/03 ID and VFR key instructions amended
2.9 08/04/05 Amended for function changes incorporated into software revision 1.6.4
01R3 11/05/06 Amended for 1.6.5 software
01R4 27/05/06 Hardware and software revision references amended Mobile phone to be turned off references
01R5 22/11/06 Display graphics updated
01R6 10/05/07 VFR and ID key descriptions amended
01R7 12/05/08 Warranty Statement Upgrade
01R7-1 19/07/08 Alarm acknowledgement added
01R7-2 25/02/09 Updated Limited Warranty Statement
01R8-0 19/08/09 T2000SFL Rev.8 introduced. Serial Alt data & VSI function added – voltage functions deleted
01R8-1 30/08/10 Firmware 1-6-9 introduced
01R8-2 18-09-12 Default setting for ENC SRC is now SERIAL

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TABLE OF CONTENTS
1.0 INTRODUCTION.............................................................................................4
1.1 T2000SFL CONTROLS ...........................................................................................................5
1.2 TURNING ON..........................................................................................................................5
1.3 TURNING OFF ........................................................................................................................5
1.4 DISPLAY LAYOUT ................................................................................................................6
1.5 SPECIAL CODES ....................................................................................................................6
2.0 DISPLAY FUNCTION.....................................................................................7
3.0 CONTROL FUNCTIONS ................................................................................8
3.1 SELECT MODE KNOB ...........................................................................................................8
3.2 CODE SELECT KNOB............................................................................................................9
3.3 ON KEY....................................................................................................................................9
3.4 MODE KEY............................................................................................................................10
3.4.1 QNH OR BARO (BAROMETRIC PRESSURE) ............................................................................................... 11
3.4.2 ASSIGNED (ALTITUDE) ................................................................................................................................. 12
3.4.3 BUFFER ALT .................................................................................................................................................... 13
3.4.4 DSP ALT ............................................................................................................................................................ 14
3.4.5 BACKLITS......................................................................................................................................................... 15
3.4.6 ALERT TONE.................................................................................................................................................... 15
3.5 ENTER KEY...........................................................................................................................16
3.6 TOGGLE KEY .......................................................................................................................16
3.7 VFR – HOT KEY ...................................................................................................................17
3.8 ID KEY ...................................................................................................................................17
4.0 INITIALISATION AND SETUP...................................................................18
4.1 PROGRAM MODE ................................................................................................................18
4.1.1 VFR CODE......................................................................................................................................................... 19
4.1.2 ENC SRCE ......................................................................................................................................................... 20
4.1.3 ALTITUDE (UNITS) ......................................................................................................................................... 21
4.1.4 BARO................................................................................................................................................................. 21
4.1.5 REM STBY ........................................................................................................................................................ 22
4.1.6 EXIT PROGRAM............................................................................................................................................... 22
5.0 FREQUENTLY ASKED QUESTIONS:.......................................................23
6.0 LIMITED WARRANTY ................................................................................27

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1.0 INTRODUCTION
The Microair T2000SFL Transponder is designed to operate in the environment of a Radar Beacon System. This
system interrogates the transponder, which in turn replies with an identity code and altitude information. The
radar system consists of a network of ground stations, which sweep the horizon like a conventional radar. When
the transponder in the aircraft detects the radar sweep (is illuminated), the transponder replies with a burst
transmission giving its identity code and altitude.
The system presents the replies from all transponders in range of the ground stations on a single display screen.
This allows ATC to easily locate, identify, and see the altitude of all traffic in their airspace.
A transponder’s reply is termed a squawk. Hence the current code being used by the transponder is termed the
squawk code. At times of high airspace activity, ATC may wish to uniquely identify an individual aircraft with a
request to squawk ident. The pilot uses the ident control on the transponder to make the transponder’s squawk on
the ATC display flash for a short period. The ident control should not be used unless ATC request it.
ATC will issue a code to an aircraft requesting entry into its controlled airspace. This code is normally unique
for each aircraft, each time that aircraft passes through the airspace. The code is 4 digits long, and each digit can
range from 0-7.
The aircraft’s transponder
receives the ground station
signal asking it to transmit. The
transponder “replies” with the
code, and if operating in mode
C, the encoder altitude.
Ground stations sweep the sky with a signal, which
asks the transponder in the aircraft to transmit its
code and altitude.

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1.1 T2000SFL CONTROLS
All of the T2000SFL’s functions and features can be
accessed from the controls on the front face.
CONTROL DESCRIPTION
1 ON Key
2 MODE Key
3 ENTER Key
4 IDENT Key
5 TOGGLE Key
6 CODE SELECT Knob
7 SELECTMODE Knob
8 VFR Key
All of the keys are covered in a soft rubberized plastic, which is backlight with the display. When the key is
pressed a small click can be discerned. The selected function will operate on the release of the key.
1.2 TURNING ON
The T2000SFL is turned on by pressing the ON key. The T2000SFL
will go through a start up routine displaying self test messages,
including the display of the transponder’s serial number, a backlight
test, and ending with the operational display.
1.3 TURNING OFF
To turn off, press the ON key again, and the unit will immediately turn off.
ON KEY

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1.4 DISPLAY LAYOUT
The Microair T2000SFL is a 57mm diameter face version
to fit the standard 2 ¼ inch instrument hole.
The mounting is by 4 x M4 machine screws, located
through the panel and screwed into threaded holes in each
corner of the transponder’s front face.
Clean only with a dry cloth, and do not allow the display
face to become wet.
The mode of operation is set using the SELECT MODE
knob located at the lower left, and the standby code
(displayed on the lower line of the display) can be edited
with the CODE SELECT knob, located at the lower right.
1.5 Special Codes
There are several special codes, which are used to identify General Aviation aircraft, and some special situations
which aircraft could encounter. Misuse of these codes may result in legal charges against the user.
IMPORTANT NOTE
ALWAYS check the standby code, BEFORE transferring it to the ACTIVE
position.
0000 General Purpose code subject to regional agreement
1200 Civil VFR Flights OCTA not participating in Radar
Information Service (RIS). General Aviation Code (US and
other countries)
2000 Civil IFR Fights OCTA not participating in RIS
3000 Civil Flights in Controlled airspace
7000 VFR General Aviation Code (Europe)
7500 Unlawful Interference Code
7600 Radio Communications Failure
7700 Emergency Code
7777 Military Intercept Code (NEVER USE)
Code 2100 is a test code that can be used by qualified personal to test the transponder to ATC.
The user should check the Civil Aviation Rules/Regulations to determine the VFR General Aviation transponder
code for their country.
T2000SFL Front Face

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2.0 DISPLAY FUNCTION
The T2000SFL is a dual line display of 8 characters each, with the active code on the top line, and the standby
code on the bottom. With the SELECTMODE knob set to either the ON or ALT positions, the active code is
displayed on the top line, and the standby code is displayed on the bottom line.
In the top left corner the operational mode character (X, A, or Ccharacter) is displayed. At the top right is the
Mode A/C annunciator (Rcharacter) which also flashes with every transponder reply transmitted. If the ID key
is pressed to activate the ident function, the R character is replaced with an I character while the ident function
is operating.
With the SELECT MODE knob in the ALT DISPLAY position, the active code is displayed on the top line,
and the encoder altitude is displayed on the bottom line. If the latitude units are set to feet the altitude is
followed by the F character. If the altitude units are in metres, the altitude is followed by the M character. If no
QNH or BARO value has been entered (default 1013mB or 29.92HG), the raw encoder output is displayed as
“pressure altitude”, and the characters PA appear at the lower left. If a QNH / BARO value has been set, the Q
character appears at the lower left.
The altitude value is rounded to the nearest 10 foot increment. Be aware that where the altitude data input is
received in increments of 100ft the rounding can only be in 100ft steps also.
If the Encoder is not powered or not fitted, the message NO ALT will appear on the display.
The T2000SFL will transmit the encoder altitude (pressure altitude) only, in accordance with normal mode C
operation. The adjusted QNH / Baro altitude is never transmitted.
Standby Code
Never Transmitted
PA
Pressure Altitude as sent
from the altitude encoder.
X - STANDBY
Neither code or altitude are sent
A - MODE 3A
Transmit ON – Only ID code sent
C - MODE C
Transmit ON – ID Code and altitude sent
I
character
Squawk Ident operation
R
character (flashing)
Mode A/C annunciater
F
Feet
Altitude units are in Feet
Q
Altitude is adjusted for
QNH or barometric pressure
from the mode menu
Displayed Altitude
Altitude generated by Encoder, and may be
adjusted for barometric pressure (QNH)
Active Code
The transmitted ID code

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3.0 CONTROL FUNCTIONS
This section describes the transponder control keys and their functions. Many of the control keys have more
than one function, and some keys access multi-option menus, which can be scrolled.
3.1 SELECT MODE KNOB
The SELECT MODE knob allows the user to switch the transponder
between the 4 operating modes.
STANDBY
In standby the transponder is powered up, but will not transmit.
On the active display line the letter X appears on the left hand side.
ON
Will reply to Mode
A
interrogations. Mode
C
blind encoder is normally powered up in this mode, but
can be powered down if encoder power option is set OFF (refer E/C POW
in Initialisation and Setup
section).
On the active display line the letter Aappears on the left hand side.
ALT
Will reply to Mode
A
and
C
interrogations, with the mode
C
encoder information. In the absence of a
valid encoder input, only the Cframing pulse will be sent.
On the active display line the letter Cappears on the left hand side.
ALT DISPLAY
The standby code is replaced with the encoder altitude. If the pressure has been set via the
QNH /
Baro option of MODE MENU, the displayed altitude will be adjusted for barometric air pressure.
Altitude will be displayed in units set in ALTITUDE option of MODE MENU.
The DISPLAY ALT only displays altitude if a valid encoder input is being received. When
climbing above the transition level/layer, the user must reset the transponder at the same time as the
aircraft’s altimeter to 1013mb or 29.92HG.
If altitude is replaced on the bottom line of the display with VSI data if selected in the DSP ALT
option of the MODE MENU.
On the active display line the letter Cappears on the left hand side.
Select Mode Knob
Encoder altitude for “pressure altitude”
(1013mB or 29.92HG)
Adjusted encoder altitude for local
QNH or BARO setting

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3.2 CODE SELECT KNOB
The CODE SELECT knob can be rotated clockwise to scroll
upwards, and counter-clockwise to scroll downwards. Each digit of
the code is adjusted separately. The adjust function starts with the left
hand digit, and is moved across to the next digit by pushing the
CODE SELECT knob inwards. After 10 seconds of inactivity the
cursor will revert to the left hand digit.
When operating in the Display Alt mode with altitude displayed, the
actual Gillham 4 digit altitude code can be displayed by pressing and
holding the code select knob in.
3.3 ON KEY
The T2000SFL is turned on by pressing the ON key.
The T2000SFL then performs a self test before moving on to the
operational screen, in whatever mode the select mode knob is set to.
This test sequence includes the display of the serial number and the
firmware version.
Code Select Knob
On Key

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3.4 MODE KEY
The MODE key can be used to access two separate menus:
•If the transponder is turned on, by holding down the MODE key, and pressing the ON key, the T2000SFL
will start in PROGRAM MODE. The MODE key must be held down, until the start-up self-test messages
have been displayed.
•If the transponder is ON and in normal operation, press the MODE key to access the MODE MENU. The
first item of the MODE MENU is displayed. Step through the MODE MENU by pressing the MODE key.
After the last menu item the T2000SFL returns to the operational display currently in use.
The MODE MENU is designed to allow the operator fast easy access to functions and parameters, which may
need to be adjusted in flight.
MODE MENU QNH or BARO
Assigned
Buffer
Dsp Alt
Backlits
Alert Tone
Mode Key
USE MODE KEY TO STEP
THROUGH MENU OPTIONS
OR
USE THE Toggle KEY TO RETURN
TO THE OPERATIONAL DISPLAY

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3.4.1 QNH OR BARO (BAROMETRIC PRESSURE)
The altitude encoder outputs a pressure altitude fixed at an above mean sea level (AMSL) pressure of 1013mb
or 29.92Hg. The aircraft’s altimeter however is normally adjusted for actual surface pressure before take off.
This means the encoder altitude may not be the same as the altimeter reading.
The QNH / Baro can be entered here to allow the T2000SFL to compensate the displayed altitude for surface
pressure, and hence read the same as the aircraft’s altimeter. The default QNH is 1013mb or Baro is 29.92HG.
If the QNH / Baro is set to 1013mb or 29.92HG, the altitude displayed will default to the unadjusted pressure
altitude direct from the encoder. If the QNH / Baro is set to a discrete value (normally provided by ATC), the
encoder pressure altitude displayed will be adjusted for that QNH / Baro value.
The barometric units are set in the BARO option of the PROGRAM MODE. When MB is selected the QNH
screen is displayed, and when HG is selected the Baro screen is displayed.
Press MODE key (once) To select QNH / Baro option
Rotate CODE SELECT knob Scroll lower line to desired pressure.
Press ENTER key To set default value. The default is 1013(mb) or 29.92(HG
Press toggle key Display returns to current operational display
IMPORTANT NOTE
The T2000SFL will only transmit the encoder pressure altitude. The
adjusted QNH / Baro altitude is NEVER transmitted, even when it is
selected for display.
Example:
ATC provide a pressure of 1018mB, to
an aircraft flying at 5000 feet. The
difference from pressure altitude
(1013mB) is +5mB, which converts to
137 feet.
The T2000SFL will adjust the
displayed altitude by +137 feet, and
then round the value to the nearest
10Ft increment.
The Q character indicates that the
altitude value has been adjusted for
local pressure.

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3.4.2 ASSIGNED (ALTITUDE)
The user can input an assigned altitude given by ATC. When used with the altitude buffer value, an audio alert
and display indicator advises when the aircraft has climbed or descended, from the assigned altitude.
When the Altitude option of the mode menu is set to Feet, the
Assigned altitude is adjusted in feet.
When the Altitude option of the mode menu is set to Meters,
the Assigned altitude is adjusted in Meters.
Press MODE key (2 times) To select Assigned option
Press CODE SELECT knob Increment displayed value in units of 500 feet / 100m
Rotate CODE SELECT knob Increment displayed value in units of 100 feet / 10m
Press ENTER key To set default value. The default is 0.
Press toggle key To save and display returns to current operational display
When entering an altitude…
Press the CODE SELECT knob to increase the height value in units
of 500FT / 100M.
Rotate the CODE SELECT knob to increase or decrease the height
value in units of 100FT / 10M.
Press the ENTER key to return the ASSIGNED ALTITUDE to the default value of 0, or
Press the Toggle key to save the height value, and return to the operational display.
If Assigned is set to 0, the altitude alert function is disabled. The assigned altitude function is only active when
the SELECTMODE knob is set to DISP ALT.

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3.4.3 BUFFER ALT
The user can input a buffer altitude, above and below the assigned
altitude, to define a height band in which to fly. When the aircraft
exceeds the upper or lower limit, an indicator alert message will be
displayed. The alert message advises the pilot of how far, above or
below the assigned altitude the aircraft is. If the Alert Tone function
is ON, an audio tone is heard as well.
If the ALTITUDE option in the PROGRAM MODE is set to FEET the Buffer Alt increments are in feet. If
ALTITUDE is set to METRES, the Buffer Alt increments are in meters.
Press MODE key (3 times) To select Buffer Alt option
Press CODE SELECT knob Increment displayed value in units of 500 feet / 100m
Rotate CODE SELECT knob Increment displayed value in units of 100 feet / 10m
Press ENTER key Display returns to current operational display (No default value)
Press Toggle key Display returns to current operational display
If the aircraft climbs or descends outside the altitude buffer limits, a Hi / Lo warning is displayed on the lower
line.
ASSIGNED ALTITUDE
ALTITUDE BUFFER
ALTITUDE BUFFER
T2000SFL advises the pilot that the aircraft is 500 feet
above the Assigned altitude. If the Alert Tone function is
set on, an audio warning tone is heard.
T2000SFL advises the pilot that the aircraft is 500 feet
below the Assigned altitude. If the Alert Tone function is
set on, an audio warning tone is heard.
With the Assigned altitude set at 3500 feet, and the
Buffer Alt set at 200 feet, the display alerts will
occur over 3700 feet and under 3300 feet.
No alert will be displayed while the aircraft remains
inside the 3700-3300 buffer.

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3.4.4 DSP ALT
This MODE menu option allows the user to select from the following data sources to display on the bottom line
when the SELECTMODE knob is in the DSP ALT position:
Press MODE key (4 times) To select Dsp Alt option. The current setting is displayed.
Rotate CODE SELECT knob To select from Altitude / VSI 3S / VSI 20S
Rotate ENTER key To save Dsp Alt data option
Press Toggle key Display returns to current operational display
The altitude and VSI data units (feet or meters) are determined by the ALTITUDE option in the PROGRAM
MODE menu (refer section 4.1.3).
IMPORTANT NOTE
The VSI function is only available with the Microair EC2002 altitude
encoder, set to Microair 1ft format. Any other altitude data resolution is not
sufficiently sensitive for good VSI operation. If the serial altitude data is not
Microair 1ft format, the VSI function is NOT displayed.
Displays altitude data sourced
from the altitude encoder.
Displays the VSI data derived
from the altitude encoder data,
with a 3 second average.
Displays the VSI data derived
from the altitude encoder data,
with a 20 second average.

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3.4.5 BACKLITS
The T2000SFL display is backlit by a series of LEDS. The level of backlight can be selected from three options:
Press MODE key (5 times) To select Backlits option. The current setting is displayed.
Rotate CODE SELECT knob To select from OFF / LO / HI
Rotate ENTER key To save backlist level
Press Toggle key Display returns to current operational display
The BACKLITS setting is saved to memory. When the transponder is next turned on, the backlighting level will
be recalled from memory.
3.4.6 ALERT TONE
The Alert Tone function is used by the T2000SFL’s altitude alert function. When set ON, the Alert can be
heard through the headphones, when connected to the headphone circuit.
Press MODE key (6 times) To select Alert Tone option
Rotate CODE SELECT knob Scroll lower line to select ON or OFF. The default is ON
Press ENTER key No operation. No default value.
Press Toggle key Display returns to current operational display
IMPORTANT NOTE
Pressing the MODE key again returns the display to the operational screen.
The user can press the toggle key at any point in the MODE menu to return to
the operational screen.
Backlighting is OFF
When the T2000SFL is turned on the backlighting
will default to OFF.
Backlighting is LO
When the T2000SFL is turned on the backlighting
will default to the LO or 50% level.
Backlighting is HI
When the T2000SFL is turned on the backlighting will
default to the HI or 100% level.

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Enter Key
3.5 ENTER KEY
The ENTER key is a confirmation key used to confirm
information the user has inputted. After pressing the ENTER
key, the display will typically give the message SAVED,for a
short period.
The ENTER key is also used to quick-set a parameter to a
default value.
3.6 TOGGLE KEY
This key acts as a toggle switch, exchanging the active and standby codes.
When the transponder is operating in DISPLAY ALT the bottom line displays the
encoder altitude instead of the standby code. The standby code is stored in memory.
To toggle the active and standby codes in this mode, push the toggle key once to
display the standby code on the bottom line. The standby code is displayed for 10
seconds. Push the toggle key again to exchange the active and standby codes. Once
the codes have been exchanged, the display will revert back after 10 seconds, to
displaying the altitude on the bottom line.
In all modes of operation, only the active code is transmitted.
The toggle key is also used to return to the operational screen from the MODE and PROGRAM MODE
menus.
Toggle Key

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3.7 VFR – HOT KEY
The VFR key will default the standby code immediately to the stored VFR code.
Typically this code will be 1200 for a General Aviation aircraft. The VFR key
calls the value set in the VFR option of the PROGRAM MODE menu.
To transfer the VFR code to the active position, press the toggle key. If no code is
entered, after 10 seconds idle the standby position will revert back to the original
VFR code.
3.8 ID KEY
The ID key ( Ident ) when pressed, adds additional code information
to the transmission for ATC. The code will flash on the ATC display
as a means of uniquely identifying the aircraft’s code from any other.
The T2000SFL has the option of a remote ID switch (pin 16).
The external switch should be a momentary-ON type. The switch or
ID key only need to be pressed briefly to activate the Ident function.
VFR Key
Ident Key
I character replaces the
R
, while the
IDENT function is in operation
Press
VFR
key to bring the stored
VFR code to the standby line. In this
case VFR = 1200
To make the
VFR
code the
active code, press the toggle key
to bring VFR to the top line

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4.0 INITIALISATION AND SETUP
The T2000SFL will operate as a conventional transponder when first installed and powered up. You will be
able to turn the transponder ON/OFF, adjust the standby code, and transfer the standby and active codes.
The T2000SFL has many other features, which can be programmed. Microair recommends that the full setup
procedure be carried out prior to first flight. This section provides detailed procedures on the various parameters
and functions that can be setup from the front panel.
The following procedures provide step by step instructions to program the transponder options.
PROGRAM MODE VFR CODE
ENC SRCE
ALTITUDE
BARO
REM STBY
EXIT PROGRAM
4.1 PROGRAM MODE
To start the T2000SFL in PROGRAM MODE, hold down the
MODE key, and then press the ON key. Keep the MODE key held
down until the start up self test messsages have been displayed.
Each item can be adjusted to the desired value or option by scrolling
the CODE ADJUST knob. The selected value or option can be saved
by pressing the ENTER key. PROGRAM MODE then moves to the
next menu item.

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4.1.1 VFR CODE
This item sets the default VFR code which can be hot key accessed
from the V(VFR) key. For most countries the default general aviation
code is 1200. We recommend that this code be used.
Press MODE key Until VFR CODE message appears
Rotate CODE SELECT knob Scroll to adjust first digit of voltage
Press CODE SELECT knob Moves the digit to the right
Press ENTER key The message SAVED appears briefly on the display
The display moves to BARO menu item
The default VFR code can vary depending on the type of aircraft (eg GA, glider, balloon) and where in the
world the aircraft is operating (US VFR code = 1200, Europe GA VFR code = 7000).
0000 General Purpose code subject to regional agreement
1200 Civil VFR Flights OCTA not participating in Radar
Information Service (RIS). General Aviation Code (US and
other countries)
2000 Civil IFR Fights OCTA not participating in RIS
3000 Civil Flights in Controlled airspace
7000 VFR General Aviation Code (Europe)
7500 Unlawful Interference Code
7600 Radio Communications Failure
7700 Emergency Code
7777 Military Intercept Code (NEVER USE)
IMPORTANT NOTE
Microair does NOT recommend that the emergency codes 7500, 7600, or 7700
be used as the VFR default code. These codes should only be used in specific
circumstances.

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4.1.2 ENC SRCE
The T2000SFL can accept altitude data from the 10 line Gillham input or the RS232 serial input. The user can
select from Gillham or serial as the encoder source.
Press MODE key Until ENC SRCE message appears
Rotate CODE SELECT knob Set ENC SRCE Gillham/Serial. The default is SERIAL.
Press ENTER key The message SAVED appears briefly on the display
The display moves to Altitude menu item
Where serial is selected the T2000SFL will self detect at start up the data speed, data format, and altitude
resolution from the following commonly used altitude data protocols:
Format Baud
Rate Message Formatting Example Message (5200 feet above MSL)
Garmin AT 1200bps
#AL, space, +/- sign, five altitude digits, T+25, checksum,
carriage return
#AL +05200T+25D8[CR]
Magellan 1200bps
$MGL, +/- sign, five altitude digits, T+25, checksum,
carriage return
$MGL+05200T+250C[CR]
Northstar,
Garmin
4800bps
ALT, space, five altitude digits, carriage return
ALT 05200[CR]
Trimble, Garmin 9600bps
ALT, space, five altitude digits, carriage return
ALT 05200[CR]
Microair 9600bps
STX, a=, - (if negative), five altitude digits, ETX,
checksum
[STX]a=05200[ETX]9A
Where the ENC SRCE is set to GILLHAM, the T2000SFL will convert and output the altitude data as SERIAL
data at a rate of once a second in the Garmin AT format in 100ft increments.
Gillham
Altitude Data
Serial
Altitude Data