NEXSYS® Component Technology – Sensors & Detectors

ARINC 429 Single-Bit Converter

ARINC 429 Signal Converter

The ARINC 429 Single-Bit Converter component is an 8-pin logic and interface device that can replace the need for a stand-alone dedicated ARINC converter box. The ARINC 429 Single-Bit Converter can be integrated into a traditional High Capacity switch housing, or can be inserted into a stand-alone NEXSYS Module for use in-line or behind the panel. The ARINC 429 Single-Bit Converter can also be combined with electromechanical switches and other LCT components to create a custom configuration that uniquely addresses the designer’s specific functional requirements. The ARINC 429 Single-Bit Converter is designed and tested in accordance with MIL-PRF-22885 and DO-160.

  • Industry first innovation - ARINC 429 converter inside standard VIVISUN annunciator.
  • No software, firmware or programmable logic.
  • No stand-alone decoder required to achieve annunciation based on data bit.
  • Accommodates two additional discrete inputs to provide “fail” monitoring.
  • Includes watchdog timer to monitor validity of incoming ARINC data stream.
  • Ideally suited for ADS-B OUT pilot interface requirements.
ARINC 429 Block Diagram

How it Works

The SR429/1M is a single bit ARINC converter, with additional inputs for up to two independent discrete analog signals. The typical application for the SR429/1M is for failure indications, although the device can be used for a wide range of ARINC digital to analog conversion situations. What makes the SR429/1M device unique is its ability to be packaged inside a traditional switch, indicator or NEXSYS Module.

Component Features

Transponder supplies the ARINC decoder circuitry with the two wire ARINC signal input and can be configured with the following options:

  • Any single ARINC Label (000 – 377)
  • Any single data bit from selected label (11 – 31)
  • ARINC transmission speed (High or Low)
  • ARINC bit output type (Pin K4)
  • Can be specified to be Active Low or Active Open when selected data bit = 1
  • Handling of SDI Bits (Bits 9 & 10)ARINC parity checking (On or Off)

Fail Sense Circuitry:

The internal fail sense circuitry simultaneously monitors the operation of the internal ARINC decoder and 2 optional external inputs and drives a single discrete output. Output will be normally Ground and become Open (high impedance) upon 1) a “fail” signal from the internal health monitor or 2) an indication from either of the optional external inputs.