Peter wrote:
What interface is ARINC? Isn't it RS422?

"jmk" wrote
I agree - for aircraft differential RS-422 is much better (or ARINC
429).

No. ARINC-429 is the most common avionics bus on commercial airliners.
Electrically it is +/- 10 Vdc, return-to-zero, differential pair.
There are two speeds, one around 100 kbps and one down around 12,500
bps. Very tight limits on rise and fall times.

Software wise, it's pretty much fixed message length (packets), with
most of the message types pre-defined (international standard).

It's not hard to implement, but if you want to meet the drive specific
conditions (rise/fall times, loading) you either have to implement your
own circuitry with a bunch of op amps, or use one of the very few -429
driver chips out there. There is a good tutorial at:


http://www.condoreng.com/support/dow...NCTutorial.pdf