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Q&A Why is the ACK (acknowledge bit) in the CAN bus frames dominant? What could have been the rationale behind that design decision?

In addition to what Lundin said, making ACK dominant means that something out there is actively responding, and that response is affirmative. If ACK were recessive, then the transmitting node bein...

posted 3y ago by Olin Lathrop‭

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#1: Initial revision by user avatar Olin Lathrop‭ · 2020-10-30T17:05:47Z (over 3 years ago) 
In addition to what Lundin said, making ACK dominant means that something out there is actively responding, and that response is affirmative.  If ACK were recessive, then the transmitting node being totally cut off from everything else would appear like no error.

Put another way, without an active affirmative response, you can't tell the difference between <i>"everyone is happy with this frame"</i>, and <i>"the system is so broken that nobody saw the frame"</i>.