L3 Technologies AFIRS228S Manuel D’Utilisation
AFIRS 228S Iridium Global Communications System Installation Manual
16 July 2014
L-3 Aviation Recorders Proprietary
Page 45
165E5733-00 Rev. 03
available. For example, if the SDU is connected by Ethernet to a Class 2
EFB that is routinely
turned off and stowed for take-off and landing, the port should be configured as “Not
Monitored” or the system will generate a fault whenever the EFB is disconnected.
REPLACE WITH UPDATED DIAGRAM FROM AIRBUS – This was NOT updated when the Non-
EFB document was because only the non-EFB drawing was created at that time.
Monitored” or the system will generate a fault whenever the EFB is disconnected.
REPLACE WITH UPDATED DIAGRAM FROM AIRBUS – This was NOT updated when the Non-
EFB document was because only the non-EFB drawing was created at that time.
Figure 6-5 – Rear Ethernet Ports
6.9 Discrete Inputs
The Iridium SATCOM System has 16 Discrete Inputs, of which 14 are software-configurable for Open-
Ground or Open-28V signaling levels, Active High or Active Low logic, and the assigned function.
Ground or Open-28V signaling levels, Active High or Active Low logic, and the assigned function.
6.9.1 Landing Gear Control Interface Unit (LGCIU) Input
Discrete input no. 1 (Din 1) is dedicated for use as a Landing Gear Control Interface Unit (LGCIU1)
input. When there is only one LGCIU input (i.e. the LGCIU2 function is not assigned to a discrete
input; see Section 6.9.2) and the LGCIU1 input transitions to the active state, the system is signaled
that the aircraft is on the ground, and the inactive state indicates that the aircraft is in the air.
input. When there is only one LGCIU input (i.e. the LGCIU2 function is not assigned to a discrete
input; see Section 6.9.2) and the LGCIU1 input transitions to the active state, the system is signaled
that the aircraft is on the ground, and the inactive state indicates that the aircraft is in the air.
LGCIU1 (Din 1) is only an Open-Ground input; it cannot be configured as an Open-28V input. A
Hardware Programming Pin (HPP) is provided to set whether the LGCIU1 input is Active High or
Active Low. If the LGCIU HPP pin (J1B-11F) is tied low, LGCIU1 is configured as an Active Low input,
i.e. Ground = On Ground. If the LGCIU HPP pin is connected to ground, LGCIU1 is configured as an
Active High input, i.e. Ground = In Air.
Hardware Programming Pin (HPP) is provided to set whether the LGCIU1 input is Active High or
Active Low. If the LGCIU HPP pin (J1B-11F) is tied low, LGCIU1 is configured as an Active Low input,
i.e. Ground = On Ground. If the LGCIU HPP pin is connected to ground, LGCIU1 is configured as an
Active High input, i.e. Ground = In Air.
If one of the configurable discrete inputs is configured for the LGCIU2 function (see Section 6.9.2), the
following logic is used to determine the aircraft’s Air-Ground status:
following logic is used to determine the aircraft’s Air-Ground status:
•
When the LGCIU1 discrete input is in the active state (as configured by the LGCIU HPP
strapping) and the LGCIU2 discrete input is in the active state (as defined by the ICT setting
for the discrete input configured as “LGCIU 2”), the aircraft is considered as “on the ground.”
strapping) and the LGCIU2 discrete input is in the active state (as defined by the ICT setting
for the discrete input configured as “LGCIU 2”), the aircraft is considered as “on the ground.”
•
When any of the LGCIU discrete inputs are in the inactive state, the aircraft is considered as
“in the air.”
“in the air.”
6.9.2 Function Assignment
The discrete inputs are software configurable. Once a function is selected for any given input, it is no
longer available for assignment to any of the other inputs. See Figure 6-6.
longer available for assignment to any of the other inputs. See Figure 6-6.