AVR-Chat

Hi all
   
  thanks guys for suggestions.. seems everybody is talking about rs422/rs485. im doing some reading about this protocol and searching rs485 ic's.this is not long distance communication. they are actually near with each other about 2 feet max. somebody mentioned about addressing. this is good idea since my 18 control lines may be elliminated.
   
  regards
   
  mago
   
  

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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