CHADeMO protocol understanding
Know that Industrial standards are not usually free or easy to find and often behind a paywall.
But with keywords and Socratic learning methods, you can find what you need by this.
e.g. https://www.researchgate.net/profile/Allan-Miller-6/publication/319162700_Rapid_EV_Chargers_Implementation_of_a_Charger/links/5996027ca6fdcc35c6bfee96/Rapid-EV-Chargers-Implementation-of-a-Charger.pdf?origin=figuresDialog_download