Tmap Bus; Altitude Out; Tc978 Connections; Personality Module Installation - FreeFlight ADS-B FDL-978 Series Installation Manual

ADS-B FDL-978 Series and
Lite Series Installation Manual
Document No. 87343 Rev F

2.7.3 TMAP Bus

TMAP is a proprietary protocol using RS-485 bi-directional serial bus between the TC978 and
FDL-978-XVR. The TC978 RS-485 lines (TMAPA and TMAPB) are connected to the FDL-978-
XVR RS-485 lines (TRxD3+ and TRxD3-) respectively.

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 (See Section 6.1.1). The pressure altitude data output depends
on the Altitude input configuration. If an external Altitude/Air Data Input is configured to a FDL-
978 Lite Series or FDL-978-XVR ARINC (FDL-978-XVR only) 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 should feed the aircraft transponder so they share the same
altitude source.

2.7.5 TC978 Connections

PIN
J1-18
J1-2
J1-32
J1-20
J1-21
2.8

Personality Module Installation

The PM is intended to be installed inside the DB-44 connector backshell of the cable harness in
the aircraft. The PM allows the FDL-978 Series and the TC978 to be removed and replaced
without having to re-configure the system.
The following install kit parts from the FDL-978 Series PM Install Kit (P/N 87002-00) are used to
install the personality module in the backshell:
Item
1
2
2
3
2-14
DB-44
SIGNAL
Vcp
GND
REM ON
TRxD3+
TRxD3-
Qty Description
1 Personality Module (P/N 85945-00-A)
4 Pin Contact, Crimp 24-28 AWG (P/N 86967)
4 Pin Contact, Crimp 24-28 AWG (P/N 83145)
1 Double-sided Adhesive Tape (P/N 87006)
TC978 (DB-9)
PIN SIGNAL
8 POWER
1,6,9 GND
7 REM ON
2 TMAPA
3 TMAPB
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