So why does the last device on a bus need to have terminator resistors and the other devices can't have them?
You could say so signals reaching the end of the bus don't reflect back which tells you nothing, really, if you don't know transmission line theory. Then we have to have an understanding of the particular bus technical specifications and the theory behind that. So let's summarize several years of study from somewhat diverse fields into a few sentences that a man on the street can comprehend?
