(b)
 This pilot can also obtain manually this transfer, by either of the two following means :

 -either deactivate the PFD through the ON-OFF/brightness potentiometer set to OFF: this automatically transfers the PFD image on the ND and the PFD image replaces the ND image, - or press the PFD/ND XFR pushbutton switch.
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 EIS - DMCs/DUs Links & Reconfiguration Controls
 Figure 002

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1

 Master and Feedback DSDLs
 Figure 003

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1

 EIS (and ADIRS) - Transfer Selector Switches
 Figure 004

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 EIS - Alternate Inputs Selection
 Figure 005

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 EIS - PFD & ND Brightness & ON/OFF Controls PFD/ND XFR P/BSW
 Figure 006

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 (3)
 Transfer of the ND image on the PFD If the ND is deactivated (corresponding ON-OFF/brightness potentiometer set to OFF), or if the ND fails, there is no automatic transfer of the ND image on the PFD. However, the pilot can recover the display of the ND image on the remaining DU, which normally shows the PFD image, by means of the PFD/ND XFR pushbutton switch.

 (4)
 Operation (Ref. Fig. 007) The PFD and ND transfers are controlled by the choice of the NORMAL and ALTERNATE inputs of the PFD and ND. For a given side (CAPT or F/O), an A/C circuitry sends a discrete signal in parallel to the PFD and ND on their AA-25 contact :

 (a)
 If the EIS DMC selector switch is in the NORM position, this signal is a ground when the PFD image is to be displayed on the ND and the ND image on the PFD. In this case, the ALTERNATE inputs are selected for both DUs. This signal is an open circuit if the PFD and ND images are to be displayed at their normal location, the PFD image on the PFD, and the ND image on the ND.

 (b)
 If the EIS DMC selector switch is in CAPT/3 (or F/O/3) position, the ground and open circuit states of the discrete signal are inverted with respect to the previous case (EIS DMC selector switch in NORM position), because of the cross-wiring of the PFD and ND DSDLs. The CAPT and the F/O relay boxes perform all the above functions by controlling the state of their A-Y2 contact. Note that each pilot can always change the output state of each relay box to restore the desired display configuration by means of the PFD ND XFR pushbutton switch.

 NOTE : When setting on the electrical power, a given relay box
____ immediately controls the A-Y2 contact output state which corresponds to that required by the PFD ON-OFF/brightness potentiometer, the NORM PFD INV signal and the EIS DMC selector switch, indepently of the last state before de-energizing the A/C electrical network and assuming that the PFD/ND XFR P/BSW has not yet been pressed.
 The relay boxes keep their present output state whatever it is, in case of 28VDC electrical power supply transient of less than 200ms. But, in case of loss of the 28VDC electrical power supply, the output of the affected relay box has the open circuit state after 300ms.
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 EIS Relay Boxes - PFD/ND XFR Circuitry
 Figure 007

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1 The relay boxes perform the switching of discrete signals concerning the selection for the DME audio signals: the DME audio outputs are associated with the audio outputs of the VOR or ILS receivers (ILS if the ROSE-ILS mode is selected or if the ILS P/BSW has been pressed). This configuration is sent by the DMCs in use (1 or 3 and 2 or 3) to the Audio Management Unit. (Ref. Fig. 008)

 C. Switching of the ECAM DUs (Upper ECAM DU - Lower ECAM DU and ECAM/ND Transfer)
 (1)
 Transfer from the upper ECAM DU to the lower ECAM DU In the event of upper ECAM DU failure, the Engine/Warning image is displayed on the lower ECAM DU instead of the system page or status message. This switching is automatic : on reception of the upper DU anomaly signal, through the feedback DSDL bus, the DMC 2 ECAM channel processor switches by software to an ECAM single display configuration which privileges the E/W processing. The lower ECAM DU receives the E/W image from the DMC 2, still through its NORMAL input. The same applies when the UPPER DISPLAY potentiometer is set to OFF.
　
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