-
the data transfer to second director,

 -
the area call panel (via DEU B),

 -
the attendant indication panel (via DEU B).

 -Interface of flight compartment and avionics compartment for:
 -
the handling of cabin systems-related inputs/outputs,

 -
the control of interfaces to other systems in the flight compartment and avionics compartment.

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 CIDS DATA BUS - Top Line
 Figure 013A

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 CIDS Director - Block Diagram
 Figure 014

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 CIDS DATA BUS - Middle Line
 DEU B Interface - Block Diagram
 Figure 015

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 3_ Realization of the system function of connected cabin systems.
 4_ Realization of the programming function:
 - the current cabin layout and properties of layout-related
 equipment are stored in the director, dependent on the
 contents of the memory module.
 5_ Realization of the test function:
 - all connected cabin systems and the CIDS itself are
 separately tested.
 6_ Activation of emergency mode with minimum power consumption.

 (c) Architecture All inputs to the director are converted into a low-level digital format. The director transmits signals which are buffered and converted internally into different formats. The director circuits are divided into functional modules as follows:
 -
the audio input module,

 -
the audio output module,

 -
the digital input/output module,

 -
the CIDS bus-interface,

 -
the power supply,

 -
the microcomputer.
 The modules provide sufficient inputs/outputs for expansion of
 the basic CIDS functions.

 1 Audio Input and Output modules.
_ The audio input and output modules handels these signals:
 -
the flight compartment PA,

 -
the service interphone,

 -
the boomset microphones,

 -
the entertainment equipment,

 -any other audio sources are separately buffered and the
 audio input module shapes them where necessary. The signals are then multiplexed into PA-zones and DEU audio channels together with the outputs of programmable chime, telephone tone and evacuation tone-generators. Under control of the processing module, the input module transfers the audio signal to the bus interface module for transmission to the DEUs. It also routes audio signals to the audio output module. The audio outputs from the input module are designed to drive a Passenger Entertainment System (PES)- Multiplexer with three zones of audio. Digitally-encoded audio signals are sent from the audio input module and from the CIDS bus interface to the audio output module. The audio signals to the CIDS bus
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 2
_
 3
_
 interface are sent from the DEU type B on the middle line bus. The four PA amplifiers connect to the service interphone system, Audio Management Unit (AMU) (interphone output and PA output) and cockpit PA handset.
Digital Input/Output Module The digital I/O module contains the circuitry necessary for the director to handle ARINC 429 and RS232C links, and discrete inputs/outputs. The ARINC 429 serial interface is programmable in speed of operation. It is the interface between:
 -
the directors internal, parallel, low-level digital environment,

 -
the serial, higher-level, digital environment of ARINC 429

 communication. Shielded twisted pair cables make the connections. The RS232 interface is provided for test-purposes and is not used for regular CIDS operation. As with the ARINC 429 interface (but with a different protocol and signal-level) the RS232 module interfaces serial data communications equipment to the directors internal parallel data bus. The director gets inputs from:

 -
the sensors,

 -
the switches,

 -
the other equipment in two basic states. The two basic states are open-circuit and active ground, or open-circuit and 28 V DC. Similarily, connected equipment requires either presence of an active ground or 28 V DC, or an open-circuit for their function. The discrete interface provides the necessary isolation and buffers the inputs/outputs, and interfaces them to the director's microcomputer.
　
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