NEXSYS® LOGIC Component Technology enables avionics systems engineers to solve a myriad of complex system integration challenges directly inside of our best-in-class VIVISUN® lighted pushbutton switches and in a NEXSYS LOGIC Module.

The Application Notes featured here show a few of the possible system and integration solutions that can be achieved using the LOGIC Component Technology mix-and-match electronics, such as electronic latching flip-flops, electronic relays, Boolean logic arrays, edge-detecting pulse timers, DC voltage sensors, diodes and terminal blocks.

In this application, two identically configured annunciators each contain an SR429/1M ARINC converter (Active Low Configuration), a normally open SSR (SSR1H) and a normally closed SSR (SSR2H). Each transponder is being monitored independently by sending ARINC 429 data stream (Bit = 0; Normal, Bit = 1; Fail) and a discrete analog output for “transponder failure” (Normal = Ground, Fail = Open) to it’s respective SR429/1M.

This application uses an alternate action illuminated pushbutton switch to provide function similar to a traditional three position toggle switch. The primary active state occurs in the unlatched position and is the off state. Each time the switch is latched the active state toggles between SYS1 and SYS2. This example has the same function as a 3 position toggle switch but with the added value of an illuminated legend.

This example eliminates the need for a mechanical switch guard on an aircraft door control switch. The door open switch contacts must be held closed for 2.5 seconds to activate the opening process. Inadvertent contact with the switch for less than 2.5 seconds will be ignored preventing accidental opening of the door. The application also includes a 10 second motor run and a limit switch interrupt.

This example demonstrates a traditional illuminated pushbutton switch cycling through 6 electrically isolated states. Each time the pushbutton switch is depressed the output advances to the next state simulating the function of a mechanical rotary switch. The pushbutton legend illumination also presents a visual indication of the active progressive states.

In this example, NEXSYS LOGIC Component Technology is used to perform the function of a traditional dropout relay. The components transition from normally closed (NC) to open (high impedance) and uses the change of state to illuminate a separate indicator message.

This application demonstrates an aircraft internal communication system that connects the flight deck with the cabin. The system allows the attendant to request an intercom call but only the flight deck can activate or cancel the call. The system also allows the ATC Com to override an internal call and the cabin has an emergency call option with a visual call indication on the flight deck.