iolink

https://io-link.com/share/Downloads/Spec-Interface/IOL-Comm-Spec_10002_V10_090118.pdf

iolink-master

https://www.dave.eu/sites/default/files/DAVE-presentation-company-web.pdf
https://www.io-fly.com/indexen.html

profibus

https://kknews.cc/news/ygkyq8k.html