Technical Overview
The standard normalizes :
- the GUI definition of the CDS interface, in a binary file called DF (Definition File) defining the structure of the graphical interface tree. The GUI tree is instantiated at initialization time (called the Definition Phase in the standard) in the CDS, using the definition contained in the DF.
- the communication at runtime between the User Applications (UA) and the CDS. This communication protocol is typically used for UAs to send widgets modifications to the CDS, and return user events (such as buttons selection) from CDS to UA.
In order to be compliant with the standard, a CDS must have a kernel that can create the Widgets tree during CDS initialization, using the Definition File, and communicate with UA in both ways using the runtime protocol.
ARINC 661 does not imply the use of a particular Data bus structure to perform the low-level communication between CDS and UA. For example, an ARINC 429 or ethernet protocol can be used, but it is not mandatory.
Read more about this topic: ARINC 661
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