DCMS -FUNCTIONAL DESCRIPTION -PRINT DRIVER SUB-FUNCTION

General
The print driver sub-function transfers print jobs from AIMS functions to the flight compartment printer. The print driver sub-function receives data from and sends data to AIMS functions to:
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Process print jobs

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Communicate job status and errors.

Process Print Jobs
The print driver sub-function exchanges data with AIMS functions through the communications program interface (CPI). AIMS functions send data to the print driver sub-function to print. The print driver sets print jobs in this order:
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Flight deck communication function (FDCF)

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Central maintenance computing function (CMCF)

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Airplane condition monitoring function (ACMF)

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Multi-function display (MFD).

If the printer is busy, the AIMS functions store print jobs and send them again when the printer is ready.
Communications
The print driver sub-function sends the print job status to the original function until the print job is complete. If data communications fail between the print driver sub-function and the flight compartment printer, the print driver sub-function rejects print jobs not complete. It then sends the reject status to the original function. The print driver sub-function does not accept any print jobs until data communications to the flight compartment printer are valid.
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DCMS -FUNCTIONAL DESCRIPTION -PRINT DRIVER SUB-FUNCTION

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DCMS -FDCF FUNCTIONAL DESCRIPTION

General
The flight deck communication function (FDCF) gives the flight crew access to data communication menus and their displays. The FDCF uses instructions in software and hardware to do this. The flight crew uses the menus and displays to do these tasks:
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Downlink messages

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Uplink messages

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Review messages

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Select a medium to transmit/receive and print messages.

The FDCF has inputs, outputs, and these sub-functions to give the flight crew access to the FDCF menus and to control the displays:
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Inputs

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Display/switch interface

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FDCF main sub-functions

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Redundancy management

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BITE

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Airline modifiable information (AMI)

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Communications program interface (CPI) input/output (I/O).

Inputs
The FDCF uses inputs and the DCMF interfaces to do the FDCF sub-functions. These components send input data:
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CDU’S

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DSP

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CCD’S

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ACCEPT switch

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REJECT switch

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CANCEL switch

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RTP’S.

Display/Switch Interfaces
The display/switch interfaces convert the inputs to a format that the FDCF can use. Inputs show in order of time. The new format goes to the main FDCF sub-functions.
Main FDCF
The main FDCF lets the flight crew make menu selections. These are the main FDCF sub-functions:
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Main menus

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Sub-menus

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Up/downlink displays on a multifunctional display (MFD)

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Decode uplink and downlink messages

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Logic units

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Communication alerts.

The main menus sub-function uses the DSP COMM selection to show the FDCF main menu. This gives access to the sub-menus. The FDCF main menu has four sub-menus:
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Review

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Manager

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Company

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New messages.

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DCMS -FDCF FUNCTIONAL DESCRIPTION

The sub-menus sub-function uses the CCD selection to show a sub-menu. This gives access to a display for flight crew control and entry.
The up/downlink sub-function gives the flight crew control to receive, send messages, and make entries on a display. The flight crew uses the CCD to make selections on a display. To make an entry on a display, the flight crew uses the CDU scratch pad to type the message. They use the CCD to transfer the scratch pad data to a data field in the selected MFD. Data transfer occurs when you select box prompts or a line with dashes on the the MFD.
The decoding sub-function decodes the uplink messages and codes the downlink messages. This process is necessary to support these display features:
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Buttons that show in the display

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Data fields for entry

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Information that shows in the information display box.

The logic unit sub-function uses CDU, panel, and switch inputs to support display formats. It also uses the decoding sub-function to make sure that certain buttons and fields are active or not active on a display.
　
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