Re: Cheap Processors with Fast USARTs for RS485?

From: CBFalconer (cbfalconer_at_yahoo.com)
Date: 01/10/05 

Date: Mon, 10 Jan 2005 05:13:51 GMT

Christopher Graham wrote:
>
> I want to implement low cost rs485-connected data collection nodes,
> and need to choose a microcontroller for them that will support
> baud rates of more than say 400 kbps, preferably up to 1 mbps. I
> know there are some PIC18Fxxxx's that have an "Advanced UART" that
> are claimed do this. Other alternatives?

Having the terminals handle the rates is not the major problem.
However getting a clean signal from point to point is another
matter. You should first do some experiments with the actual
wiring and line terminations etc, put some signals on and see how
they appear at various points. Haul out the scopes. Watch out for
how the lines get turned around.

The protocols you use will also make a major difference. 

-- 
Chuck F (cbfalconer@yahoo.com) (cbfalconer@worldnet.att.net)
   Available for consulting/temporary embedded and systems.
   <http://cbfalconer.home.att.net>  USE worldnet address!

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