[Jared Russell]

Originally Posted by EricVanWyk

Your first statement is technically true, your second statement is not.

CAN in and of itself does not define the physical layer. However, it does define that the physical layer must have one dominant and one recessive state. Neither the serial port nor the ethernet port have this feature.

Additionally, "CAN" almost always implies a physical layer specified in ISO 11898-2. It is very possible to use other physical layers, but in conversation you would need to specifically mention you are doing something unusual.

In short, new hardware is required.

Gotcha. Thanks for the clarification!