AIU converts analogue and discrete signals from diverse source and sensors of aircraft to serial interface protocol, such as ARINC429, RS-422/485, CAN (ARINC 825) or AFDX (ARINC664)

Input signals are from:
-Air pressure sensors
-Free Gyros, compass
-INS systems
-All Syncro and resolver sensors
-Radio Altimeter
-Fuel sensors
-Engine sensors