ADS-B FDL-DB Dual Band Series
Installation Manual
Document No. 88552 Rev A
FFS Copyright © 2020 All rights reserved.
2-31
2.7.4 Altitude Out
The TC978 outputs pressure altitude data on this RS-232 serial output pin (ALT_OUT) at 9600
baud using the “Icarus” format (Refer to 2.8 for more details). The pressure altitude data output
depends on the Altitude input configuration. If an external Altitude/Air Data Input is configured to
a FDL-DB-XVR ARINC or Serial port
,
then the pressure altitude data output from the TC978 will
pass through data from that sensor.
If an Altitude/Air Data Input is
not
configured, then the pressure output defaults to the TC978
built-in altitude encoder. If used, this output must feed the aircraft transponder, so they share
the same altitude source.
2.7.5 TC978 Connections
DB-62
TC978 (DB-9)
PIN
SIGNAL
PIN
SIGNAL
J1-24
Vcp
8
POWER
J1-2
GND
1,6,9
GND
J1-44
REM ON
7
REM ON
J1-26
TRxD3+
2
TMAPA
J1-27
TRxD3-
3
TMAPB