Regarding AOA and Pitot and Static pressures:
AOA are digital signals to and from the ADR part of the ADIRU's.
Pitot probes or static ports pressure go through ADM's (Air Data Modules) via ARINC busses to the ADR's.
ADM inputs are one pressure input and several discrete inputs. All ADM's are identical. The discrete inputs determine the ADM location and the type of pressure data (Pitot or Static) to provide to the ADR part of the ADIRU. The ADIRU's provide a DC voltage to supply each associated ADM.
Each ADM contains the following components: a pressure transducer which converts pressure into an analog signal. This analog signal is then converted into a digital signal by means of an analog/digital converter. The digital signal then passes through a microcomputer which processes an ARINC signal according to the discrete inputs and according to the digitized pressure.
The ADM output is an ARINC bus which provides digital pressure information, type of pressure, ADM identification and BITE status to the ADIRU.
The ADR processes sensor and ADM inputs in order to provide air data to "users."
Captain and F/O static ports directly provide static pressure to four ADM's which, as mentioned above, convert this pressure into digital format. ADR1 and ADR2 compute the average static pressure value from left and right ADM's.
Standby static ports provide an average pressure directly to the standby instruments and to a single ADM connected to ADR3.
The three pitot probes directly provide the total pressure to three ADM's. Capt. pitot thru an ADM connected to ADR1, F/O pitot thru an ADM connected to ADR2, and standby pitot thru an ADM connected to ADR3.
Regards,
G-d