Hi could anyone please advise, I have a car OBDII to USB interface (circuit attached) that needs to connect to another device. Normally a car would provide a 12v power source to pin 16. But ideally I need to use a 5v supply to pin 16. If I do so, am I correct in assuming that the subsequent serial output on either K-Line will be 0v / 5v rather than the normal 0v / 12v high/low? i.e. the output uses the power supply on pin 16 as a reference? Many thanks.
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