Figure 6-4 - Cfdiu Interface; Table 6-1 - Serial Port Pin Assignments - L3 Aviation Products SDU L-3 Quick Start Manual

6.6 CFDIU Interface
The SDU communicates with the Airbus Centralized Fault Display Interface Unit (CFDIU) over
two ARINC 429 Low Speed busses, (1) input and (1) output as shown in
Figure 6-4 – CFDIU Interface
6.7 Date, Time and Position
The Airbus Iridium SATCOM System uses date, time and position information for numerous purposes,
including information tags attached to various reports and events. Date, time and position information
is provided by the system's internal GPS.
6.8 RS-232/422 Databus
The Airbus Iridium SATCOM System has four serial ports (transmit and receive). Each port is
software-configurable for RS-232 or RS-422 mode. The speed, data bits, parity, stop bits, and flow
control settings for each port are also software-configurable. See Figure 6-5.
Each serial port is assigned 5 pins on the rear connector. The function of these pins is dependent on
whether RS-232 or RS-422 mode is being used.
Table 6-1 – Serial Port Pin Assignments
RS-232 RS-422
TXD Tx-
RTS Tx+
RXD Rx+
CTS Rx-
Com Not Used
165E5733-00
Issue, Rev. 02
21 January 2014
Airbus Iridium SATCOM System
Port 1 Port 2
9E 9J
9F 9K
9G 10A
9H 10B
7J 9A
L-3 Aviation Recorders Proprietary
Figure 6-4
Port 3 Port 4
10C 10G
10D 10H
10E 10J
10F 10K
9B 7K
.
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