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For the sake of science, I took apart a Model 3 Gen 2 NEMA 10-30 adapter to see how it communicates the charging current to the UMC. The Gen 1 adapters which have been used for Model S and Model X achieve this by means of an internal resistor connected between ground and the communication pin. The Gen 2 adapters however do not use a resistor - instead there's this little circuit board, slightly larger than a fingernail, buried deep inside the adapter and connected to the two communication pins:
gen2circuit.jpg

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