Re: RS485 communication

From: David Woodhouse (dwmw2@infradead.org)
Date: Sun Mar 16 2003 - 05:51:47 EST


On Sun, 2003-03-16 at 10:35, Russell King wrote
> No - that's not how RS485 works. With a balanced line, the result
> that any one receiver will see will depend on it's position on the
> line and the relative distance to each transmitter, the resistance
> of the line, and the manufacturer/type of the RS485 transceiver.
> In other words, the state you see is indeterminent.

Ah, OK. Then I must have been mistaken in thinking that CAN was based on
RS485 -- or mistaken in remembering that that's how CAN does collision
avoidance I suppose, but I suspect the former is more likely.

Thanks for the correction.

-- 
dwmw2

- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/



This archive was generated by hypermail 2b29 : Sun Mar 23 2003 - 22:00:18 EST