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2007-02-28 by magzky02
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
2007-02-28 by Jim Wagner
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.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 > --------------------------------------------------------------- The Think Different Store http://www.thinkdifferentstore.com/ For All Your Mac Gear ---------------------------------------------------------------
2007-02-28 by Ricardo Callejo
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 > ---------------------------------------------------------- The Think Different Store http://www.thinkdif <http://www.thinkdifferentstore.com/> ferentstore.com/ For All Your Mac Gear ---------------------------------------------------------- [Non-text portions of this message have been removed]
2007-02-28 by Ricardo Callejo
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 > ---------------------------------------------------------- The Think Different Store http://www.thinkdif <http://www.thinkdifferentstore.com/> ferentstore.com/ For All Your Mac Gear ---------------------------------------------------------- [Non-text portions of this message have been removed]
2007-02-28 by Jim Wagner
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 > > > > ---------------------------------------------------------- > The Think Different Store > http://www.thinkdif <http://www.thinkdifferentstore.com/> > ferentstore.com/ > For All Your Mac Gear > ---------------------------------------------------------- > > > > > > [Non-text portions of this message have been removed] > --------------------------------------------------------------- The Think Different Store http://www.thinkdifferentstore.com/ For All Your Mac Gear ---------------------------------------------------------------
2007-03-01 by mago Umandam
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
>
----------------------------------------------------------
The Think Different Store
http://www.thinkdif <http://www.thinkdifferentstore.com/> ferentstore.com/
For All Your Mac Gear
----------------------------------------------------------
[Non-text portions of this message have been removed]
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