Abstract: An aircraft control or interface unit with a programmable controller includes an isolated, non-volatile command memory containing the complete, fixed set of non-compiled, text-format commands used for every application programmed into an instance of the aircraft control or interface unit. A command interpreter automatically and sequentially interprets and executes the command set in a continuous loop, where the command set encompasses all commands necessary for the ability to activate, implement and disable all available input, output and processing capabilities within the hardware configuration of the aircraft control or interface unit.

Abstract: An aircraft annunciator (illuminated switch or indicator) includes, within a housing sized to fit in the panel cutout for a single pushbutton aviation switch, a bus converter to interface with a multiplexed ARINC serial data bus, in order to monitor a remote item of equipment such as an ADS-B transponder. The annunciator is coupled by selected pins to receive data words from the multiplexed ARINC serial data bus. A watchdog timer is continuously reset by valid messages from the transponder, logically ORed with the power supply as well as external analog fault signals in order to generate an output controlling illumination of an FAA-mandated “ADS-B FAIL” legend on the annunciator.