(2)
 FMGC/ATSU interface This interface supports broadcasted data exchanges on its buses.

 (a)
 Identification of the master/slave FMGC for communication and guidance Both FMGCs operate simultaneously. One of them is in charge of communication with the ground, the other one is in charge of the guidance (the ATSU acquires navigation data from this FMGC). The ATSU determines which FMGC is the communication master and which FMGC is the guidance master. If no specific FMGC is required by the ground, the ATSU sends uplink data to the communication master FMGC and gets back downlink messages from this FMGC. If the ground requires a specific FMGC, uplink data are sent to the required FMGC.

 (b)
 Status of the datalink communication The ATSU and both FMGCs exchange status information in order to determine the availability of the datalink communication: status of the communication with the ground and between the ATSU and the FMGCs.

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 (c) Periodic Data These data are mainly navigation data and are used by hosted AOC application. The ATSU/FMGC interface supports exchanges using ARINC 429 Williamsburgh protocol. These exchanges concern ARINC 619 messages related to the remote AOC application hosted in the FMGC. These messages are FMGC downlink reports or uplink requests.
 The used System Address Labels are:
 -FMGC1 SAL is 300
 -FMGC2 SAL is 301
 -ATSU SAL is 304
 (d)
 Flight Number This parameter is sent by the FMGC to the ATSU.

 (e)
 Pin-programming The configuration of the ATSU/FMGC interface is parametered through two pin-programmings in the FMGC:

 -
Pin-programming 'Mini ACARS': only broadcast data are transmitted from the FMGC to the ATSU.

 -
Pin-programming 'Full ACARS': broadcast data are transmitted from the FMGC to the ATSU and AOC messages are exchanged between the ATSU and the FMGC.

 NOTE : The Airline Policy File (ALPF) with the ACARS options is
____ contained in the FMS navigation data base.
 NOTE : Activation of Printer Interface in FMS is mandatory for
____ Full ACARS configuration, to avoid the display of "FMS INOP" message on the MCDU.
R **ON A/C 062-099, 106-149, 151-156, 159-199, 201-299, 301-399, 401-499,
R Post SB 46-1013 For A/C 062-099,151-156,201-209,
 The FMGC supports a pin-programming indicating which equipment is
 installed: the ACARS MU or the ATSU.
 The FMGC can determine that the ATSU is functioning on-board and
 that the ATSU interface is to be taken into account.

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 (3) MCDU/ATSU interface The ATSU interfaces with the three MCDUs (the third MCDU is optional), but it can only dialog with two of them simultaneously. The MCDUs are Multipurpose Control and Display Units with a standard interface for different on-board systems.
 (a)
 MCDU status Each MCDU sends its status to the ATSU so that the ATSU can to determine if the MCDU is available or not before sending it a page to display.

 (b)
 Connection to MCDU The ATSU sends its System Address Label to the MCDUs for connection establishment.

 (c)
 MCDU display The ATSU sends the specific pages to the MCDUS for display.

 (d)
 Keys selection The ATSU acquires from the MCDUs the key the pilot has selected. The used System Address Labels (SAL) are:

 -MCDU1 SAL is 220
 -MCDU2 SAL is 221
 -MCDU3 SAL is 222
 -ATSU SAL is 304.
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 C. Communication/ATIMS Interface
 The ATIMS is interfaced with:
 -VDR3 for VHF data communications and VHF voice/data mode control
 -SDU1 for satellite data communications
 -RMP 1/2/3 for VDR3 voice/data mode switching.
 A pin-programming received from the SDAC enables the ATSU to determine if
 the HFDR1 is installed or not.

 (1) VDR3/ATIMS interface This interface is in accordance with ARINC 750 specifications. The ATSU uses the services provided by the VDR3 to communicate with the ground in DATA or VOICE mode. Two output discrete signals from the ATSU are used to control:
 -
VDR3 switching between voice and data mode: voice/data select discrete

 -
VDR3 frequency selection (Port A for ATSU, Port B for RMP): port
　
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