(8)
 The general low speed output bus is issued to control:

 -the CFDIU This bus is not switched, and available on the three DMCs.
 G. Weather Radar Buses (ARINC 453)
 A Weather Radar equipment complying with ARINC 708-4 is installed. Each DMC receives from the W/R transceiver unit his two data buses, D1 and D2. The DMC processes information from the W/R transceiver provided that W/R operation is enabled by the W/R request control signal). Provided that the W/R operation is requested on the W/R control unit, the ND presents a W/R image in all the ND modes except the PLAN mode. If both pilots select the PLAN mode, the DMCs send the W/R REQUEST discrete signal in the open state, which disables the W/R XCVR, thus avoiding useless operating hours. Data bus selection: Each DMC receives from the W/R transceivers units their two data buses, D1 and D2. The DMC processes information from the operating W/R transceiver (only one at a time according to the position of the 1-2 selection switch on the W/R control unit and provided that W/R operation is enabled by the W/R request control signal). Provided that the W/R operation is requested on the W/R control unit, the ND presents a W/R image in all the ND modes except the PLAN mode. If both pilots select the PLAN mode, the DMCs send the W/R REQUEST discrete
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 signal in the open state, which disables the W/R XCVR, thus avoiding
 useless operating hours.
 The DMCs which operate on side 1 normally work with the DATA 1 buses
 (XCVR 1-1 or XCVR 2-1), which correspond to the CAPT range selection.
 However, the DMCs which operate on side 1 may operate with a DATA 2 bus,

 i.e. using the data corresponding to the range selected by the F/O, in case of an FMGC 1 failure which leads to an automatic changeover to the FMGC 2 data in the DMC 1. In this case, the DMC 1 (or DMC 3 if the EIS DMC selector switch is set to CAPT/3) processes the DATA 2 bus from the W/R XCVR in operation. The range markers and the mode on the Captain ND are then those corresponding to the F/O selection, which is indicated on the Captain ND by an amber message : SELECT OFFSIDE RANGE & MODE. This message may disappear sooner, if the Captain selects the same range as the First Officer. The same applies for the DMCs working on side 2, which normally use the D2 buses, but which use the D1 buses in case of FMGC 2 failure.
 NOTE : The W/R equipment has identical D1 and D2 buses, each conveying
____ all the data associated to both CAPT and F/O ranges.
 NOTE : If there is a discrepancy between the range selection from the FCU
____ and the range selection sent on the corresponding W/R data bus, no W/R image is displayed and the W/R RANGE red message is displayed.
 (Ref. Fig. 016)
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 INTENTIONALLY BLANK

R 1 1

31-68-00Page 37
1 1 Config-2 May 01/05 1 1 1CES 1

 EIS - Weather radar interface
 Figure 016 (SHEET 1)

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 EIS - Weather radar interface
 Figure 016 (SHEET 2)

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___________________________________________
 1. General
_______ (Ref. Fig. 001) Various reconfiguration possibilities are provided in the Electronic Instrument System (EIS) in order to cope with the operational requirements below in case of failure of a Display Management Computer (DMC), a Display Unit (DU) or a Control Panel (EFIS control section of the Flight Control Unit (FCU) or ECAM Control Panel) :
 -DMC transfer : EIS DMC 1/3 or 2/3 (DMC 3 replaces DMC 1 or 2)
 -PFD-ND transfer
 -ECAM DU transfer : upper DU to lower DU
 -ECAM-ND transfer : ECAM/CAPT ND or ECAM/F/O ND.
 2. Links Between DMCs and DUs
__________________________ The PFD, ND, ECAM processing channels of a DMC drive their associated DUs through a switching stage and via dedicated links called Master DSDL (Dedicated Serial Data Link).
 The Master DSDL conveys instructions and data.
 In certain conditions, programs are teleloaded from the DMCs to the DUs via this DSDL.
 More particularly, this teleloading operation takes place at DMC initialization (electrical power on setting) if the program stored in the EPROM of the DUs does not match the operational program stored in the DMC memory modules.
 Another kind of teleloading process takes place from the DMC to the
　
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