ADS-B FDL-978 Series and
Lite Series Installation Manual
Document No. 87343 Rev G
3-10
FFS Copyright © 2016 All rights reserved.
3.3.2.1 Serial Port Input Configuration
The following tables define the serial port input data formats and baud rate settings:
Table 6. Serial Port Input Configuration Settings
Setting
(1)
Interface
Description
UNUSED
(Not Used)
-
No connection to serial port
ADS
(Air Data Computer)
Altitude
Input
Altitude, Airspeed, and Vertical Rate data input. Format for
air data sensors using the protocol in Section 6.2.
Alt-Encoder
(Altitude Encoder)
Altitude
Input
Altitude data. Format for air data sensors using the
protocol in Section 6.1.
Internal-GPS
(GPS Internal)
GPS Input
GPS position, velocity, time, and integrity data input and
output. Selects use of the internal GPS (models with GPS
only). Baud rate must be set to 19200. Internal GPS is
only valid for serial port 1. The internal GPS data is used
by the FDL-978 Series and GPS data is automatically
output at 19200 baud on serial output port 1 using the
FFS/Chelton Protocol. The output is TSO-C145c Class
Beta 1 certified and can be used as an ADS-B position
source or navigation source.
GPS-FFS
(5)
(GPS - FreeFlight)
GPS Input
GPS position, velocity, time, and integrity data input.
Format for the FFS 1201 or other sensors that support the
FFS/Chelton Protocol. Typically configured on port 1.
GPS-ADS-B Plus
(5)
(GPS - GNS ADS-B)
GPS Input
GPS position, velocity, time, and integrity data input.
Format for the Garmin Series 400/500 ADS-B Plus GPS
Protocol.Typically configured on port 1.
GPS-KSN
(5)
(GPS - Aviation)
GPS Input
GPS position, velocity, time, and integrity data input.
Format for the Bendix King KSN 765/770 GPS PXPRESS
Protocol. Typically configured on port 4 or 6 (configured
for RS-232).
GSL-71
(Control Panel)
Control
Input
(2)
Squawk Code, IDENT, Call Sign, mode (standby/alt
inhibit), and altitude data input. Format for the GSL-71
controller or SL70/R transponder.
(6)
GTX-Remote
(GTX Remote)
Control
Input
(2)
&
GPS
Output
Squawk Code, IDENT, and mode (standby/alt inhibit)
control input format from GTX 330/33/327/32
transponders. Typically configured on port 2.
(4) (6)
Internal GPS models will automatically output GTX
Remote (GPS) protocol data on the same port. This GPS
output is a compliant ADS-B Out position source for the
GTX 330/33 with ADS-B Out.
Disp-Cntrl
(TIS/FIS)
Control
Input
(3)
Squawk Code, IDENT, Call Sign, and mode (standby/alt
inhibit). Enables display control from an MX-20, GMX-200,
or other displays using the GDL/FDL protocol. The
corresponding serial output port must be configured to
TIS-FIS or MX-20 at the same baud rate to enable display
control input.
(2) (6)
