L3 Technologies AFIRS228S User Manual
AFIRS 228S Iridium Global Communications System Installation Manual
16 July 2014
L-3 Aviation Recorders Proprietary
Page 29
165E5733-00 Rev. 03
3.9 ARINC 429 Receiver Activity Status
Defines the criteria the Iridium SATCOM System uses to determine if a receiver port is active. A bus is
generally declared active when four consecutive words at the specified rate are received, and
declared inactive when four consecutive samples fail.
generally declared active when four consecutive words at the specified rate are received, and
declared inactive when four consecutive samples fail.
Table 3-6 – ARINC 429 Receiver Port Monitoring
Receiver
Activity Label
Minimum Update Rate
ATSU / FWC
270
1 Hz
ARINC 739A MCDU
270 / 377
1 Hz
3.10 ARINC 429 Transmitter Protocols
3.10.1 From SDU to ATSU / FWC
Table 3-7 – ARINC 429 Transmitter Protocols SDU – ATSU/FWC
Destination:
ATSU / FWC
Speed: High
(Configurable)
Label
Parameter
Format
Transmit
Rate
Rate
Update Rate
172
SDU Identifier
BCD
1 s
–
270
SDU Status Word and
Monitoring
Monitoring
Boolean
word
1 s
-
304
ATSU SAL
HYB
ARINC 618
Block Uplink
BOP (GFI=Eh)
ISO 5
N/A
-
ARINC 618
Block Downlink
BOP (GFI=Eh)
ISO 5
N/A
-