ADS-B FDL-978 Series and
Lite Series Installation Manual
Document No. 87343 Rev G
3-42
FFS Copyright © 2016 All rights reserved.
3.6.2.1 Aircraft Mode S (or ICAO) Address
The Mode S address is a 24 bit number assigned to the aircraft and is represented in a six
character hexadecimal format. The CODE knob is used to change each character as required.
Each character of the Mode S address is a number between 0 to 9 or a letter between A to F.
When the ENT button is pressed the cursor advances to the next character as shown below.
To advance to the next configuration item without changing the ICAO address either scroll
through the six characters by pressing the ENT button six times or press the FN button.
3.6.2.2 VFR Squawk Code
VFR Squawk Code is a pre-programmed default code when the pilot is flying VFR and not in
contact with ATC. When the pilot presses the VFR button, the VFR Squawk Code will replace
the current Squawk Code. In the USA, the VFR Squawk Code is 1200 and in most parts of Europe
the VFR Squawk Code is 7000.
The default VFR Squawk Code cannot be changed in-flight and can only be set in
the configuration mode.
The VFR Squawk Code is a 12 bit number and is represented as a four character octal number.
The CODE knob is used to change each character as required. Each character of the Squawk
Code is a number between 0 and 7. When the ENT button is pressed the cursor advances to the
next character as shown below.
To advance to the next configuration item without changing the VFR Squawk Code either scroll
through the four characters by pressing the ENT button four times or press the FN button.
3.6.2.3 VFR Flight ID
The VFR Flight ID (aka Call Sign) is usually one of the following types:
Type A – The characters corresponding to the registration marking of the aircraft.
Type B – The telephony designator of the aircraft operating agency, followed by the last
four characters of the registration marking of the aircraft.
Type C – The telephony designator of the aircraft operating agency, followed by the
flight identification.
