AVR-Chat

Yes, have used both RS422 and RS485. The original post said
nothing about that. Just UART with a number of slaves and
some control lines. There was not enough information to
answer his question(s).

Jim

On Wed, 28 Feb 2007 14:49:40 -0300
 Ricardo Callejo <surbyte@speedy.com.ar> wrote:
> Jim, did you read something about RS485/RS422? 
> 
> They support 1200 meters, using resistors on each end
> line. 
> 
> 120 ohms between lines of the transceiver and 680 ohms to
> VCC from one wire
> and 680 ohms to ground from the other wire.
> 
> Vcc 680ohms 1st Terminal 120 Ohms 2nd Terminal 680 ohms
> ground.
> 
>  
> 
> Ricardo Callejo
> 
> Argentina
> 
>  
> 
>   _____  
> 
> De: AVR-Chat@yahoogroups.com
> [mailto:AVR-Chat@yahoogroups.com] En nombre de
> Jim Wagner
> Enviado el: Miércoles, 28 de Febrero de 2007 02:19 p.m.
> Para: AVR-Chat@yahoogroups.com
> Asunto: Re: [AVR-Chat] communication b/n many controllers
> 
>  
> 
> Are you using any sort of interface
> (transmitter/receiver)?
> 
> What is the distance from the host and the slaves?
> 
> Do you have an enable line for every slave? Are those
> lines
> buffered?
> 
> Jim
> 
> On Wed, 28 Feb 2007 08:14:43 -0000
> "magzky02" <magzky02@yahoo. <mailto:magzky02%40yahoo.com>
> com> wrote:
> > 
> > Hello guys
> > 
> > my master controller is going to use one UART to
> > communicate with 18 
> > slave controllers. i use i/o control lines to avoid
> > corruption. My 
> > question is that is this method reliable? Is there no
> > effect of the 17 
> > others connected to the line when one is communicating
> to
> > the master? 
> > any idea?
> > 
> > regards
> > 
> > mago
> > 
> 
>
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