Here is a wonderfull 429 overview
airinc_429TheAvionicsHandbook_Cap_2
https://batchpcb.com/pcbs/73951 ia a universal converter project.
The fellows name is AllThumbs on VAF http://www.vansairforce.com/community/showthread.php?t=95229
http://www.vansairforce.com/community/archive/index.php?t-82604.html thread about the SL30 to Dynon HSI
http://www.instructables.com/id/Interfacing-Electronic-Circuits-to-Arduinos/ is a very nice explanation of a 429 to 232 converter
Here is the data from Niel on the frankenverter
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here is a nice blurb on using a parallel port to test AIRINC 429 equipment
here is some detail abouthe labels
Here is the first Distillation of equipment labels
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2024 revival project
https://github.com/ncormia/FrankenVerter
https://github.com/ncormia/FrankenVerter/blob/master/a429.h
https://github.com/ncormia/FrankenVerter/blob/master/FrankenVerter.ino