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Chademo uses the CANBUS for communications...IOW, it puts a direct line from the outside to the car's computer bus. Personally, I don't like that. The communications protocol with the SAE CCS standard seems a bit more secure to me, uses fewer fragile connections, and, in the end run, should be more reliable.
We'll see how it works out. I don't see it going away, and the current users of the CCS standard to retool and switch.
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