-
SET TIME TO DEST

 -
SET DESTINATION

 -
SET LANGUAGES

 -
SET GMT

 -DAY/NIGHT VIEWING
 -SCREEN BLANKING.
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 Power Supply
 Figure 004
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 Remote Control Unit
 Figure 005
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 In SET DISPLAY MODE the subsequent sub-menus are available:
 -AUTO MODE
 -MAP MODE
 -INFO MODE
 -LOGO MODE
 -TOTAL ROUTE
 -TERMINAL MODE.
 In SET TIME TO DEST the time to the destination is set for a countdown. The remaining time of flight is shown until the destination is reached.
 In SET DESTINATION a number of possible destinations are displayed on subsequent menus for selection of the correct one.
 In SET LANGUAGES the language used on the LCD can be changed.
 In SET GMT the correct Greenwich mean time must be set. The DIU needs it to compute the correct local times for the INFO MODE indications.
 In DAY/NIGHT VIEWING the brightness of the LCD can be set.
 In SCREEN BLANKING the subsequent sub-menus are available:
 -DISABLE BLANKING
 -ENABLE BLANKING.
 B. The Digital Interface Unit (Ref. Fig. 006) The DIU is the computer for the PVIS. It is installed in an ARINC 404A 1/2 ATR short case. Its front plate holds 2 handle bars, an electrical connector for a portable data loader and the identifacation plates. The rear plate holds the electrical connectors for the intersystem communication and the power supply.
 The DIU brings the subsequent digital data into relation:
 -
the data received from other aircraft systems.

 -
the control data from the RCU

 -
the data stored in the DIU memories.

 In reaction to the menu selection the DIU calculates the digital output data and then changes the digital data into video signals. The video signals are sent to the PES (video) for passenger information.
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 Digital Interface Unit
 Figure 006
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 An ARINC 615 data loader can be connected to the connector on the front plate of the DIU. A 3.5in. floppy disk can be used with the data loader. The memory of the DIU can be renewed or updated with the data from the files on that floppy disk. The floppy disk can hold configuration files, place name overlays for maps or data bases on airport identifiers, time zones or other data.
 7. Operation/Control and Indication________________________________ (Ref. Fig. 007, 008) When the aircraft electrical systems are energized the PVIS is supplied by the normal busbar 602PP with 28VDC through the circuit breaker 189MH.
 A. System Start-up The RCU is electrically connected to the junction box 9MH of the PES (video) for energy and data transfer. When the RCU is energized a microprocessor and its circuits on the controller card perform an initialization procedure and a self test. After the self test the start menu is indicated on the LCD. The RCU and the system is ready for input data and menu selection.
 On the DIU all cable connections for the power supply, to the other systems and the RCU are made through the connector on its rear plate. When the DIU is energized the computer and all other circuit boards perform an initialization procedure and a self test. After the self test a signal is generated for the RCU that the system is ready for operation.
 B. System Operation All input data from the use of the P/BSW on the RCU are transfered to the DIU. The DIU relates this data with its memory contents and transfers answer data back to the RCU for indication on the LCD. The indications on the LCD cause the cabin crew to push the P/BSW again until the necessary actions to complete a menu selection are made.
 The DIU relates its memory contents with the input data from the other connected systems and the menu reqiurements. It then produces the digital output data for the passengers. This digital output data is transformed into video signals in the form of pictures or alphanumeric information and sent to the junction box 9MH of the PES (video). The PES (video) shows these video signals as maps and/or as written information to the passengers.
　
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