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PICList Thread
'Data transmission over long cable lengths'
1999\02\23@121019 by Darren Logan

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Hi,
       Is RS485 the best method for transferring data over long lengths (> 1000
metres) of cable?, or does anyone know of any other method(s) that may be
worth considering. (Using PIC's of course).

Daz

1999\02\23@135511 by Gerhard Fiedler

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At 12:07 02/23/99 -0500, Darren Logan wrote:
>        Is RS485 the best method for transferring data over long lengths (>
>1000
>metres) of cable?, or does anyone know of any other method(s) that may be
>worth considering. (Using PIC's of course).

modems?

ge

1999\02\23@144739 by Wagner Lipnharski

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If you don't want to go to modems, or some other modern chips, what about
current loop?  If you have a way to drive the necessary voltage...
Wagner.

Gerhard Fiedler wrote:

> At 12:07 02/23/99 -0500, Darren Logan wrote:
> >        Is RS485 the best method for transferring data over long lengths (>
> >1000
> >metres) of cable?, or does anyone know of any other method(s) that may be
> >worth considering. (Using PIC's of course).
>
> modems?
>
> ge

1999\02\23@154437 by Darren Logan

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Is there such a thing as a MODEM CHIP ?, if so, where can I find out more
about them. This could be interesting.
I would imagine though, such a TRANSCEIVER chip would be expensive.

Current loop - yes that's a possibility, although digital would be preferable.

Darren

1999\02\23@160132 by Gerhard Fiedler

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At 15:25 02/23/99 -0500, Darren Logan wrote:
>Is there such a thing as a MODEM CHIP ?, if so, where can I find out more
>about them. This could be interesting.

there are quite a few, and a simple 2400baud fsk modem probably isn't
expensive either (and they're pretty simple to implement, hardware-wise,
and software-wise too, if you know anything about modems and at commands).
check eg. rockwell. (there are a bunch of others, i just can't remember any
right now. look at the telecom sections of manufacturers.)

>I would imagine though, such a TRANSCEIVER chip would be expensive.

not necessarily. but it depends a lot on your data rate whether it makes
sense. for low data rates you don't have to modulate, you can just send the
ones and zeros on the road.

>Current loop - yes that's a possibility, although digital would be preferable.

i'm not sure, but i think wagner meant a digital current loop (at least
that's what i thought of when i read it :) : async serial data with current
loop driver, not an analog 4..20mA loop. is probably slower and safer than
rs 485.

ge

1999\02\23@184237 by Peter Grey

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At 03:25 PM 23/02/99 EST, you wrote:

What about a RF link?


Peter
>Is there such a thing as a MODEM CHIP ?, if so, where can I find out more
>about them. This could be interesting.
>I would imagine though, such a TRANSCEIVER chip would be expensive.
>
>Current loop - yes that's a possibility, although digital would be preferable.
>
>Darren
>
>

1999\02\23@231146 by Wagner Lipnharski

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Try this for a single modem chip 2400bps solution:
http://www.ustr.net <--- click modem button.
You can buy a kit of the modem chip there.

Wagner.


Darren Logan wrote:

> Is there such a thing as a MODEM CHIP ?, if so, where can I find out more
> about them. This could be interesting.
> I would imagine though, such a TRANSCEIVER chip would be expensive.
>
> Current loop - yes that's a possibility, although digital would be preferable.
>
> Darren

1999\02\24@090536 by Christopher Fowler

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face
Just for fun - Jameco has a 300 baud modem chip - 20 pin dip - $5.95
http://www.jameco.com

- Christopher
~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
Christopher Fowler
HED, ChronoFish LLC
spam_OUTchristopherTakeThisOuTspamChronoFish.com
...
{Original Message removed}

1999\02\24@204226 by Antonio L Benci

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picon face
Have a look at RS485 differential drivers and receivers. I have run
cables lengths of 250m (~750') and 1000m (~3000') both with multidrop
and point to point configurations. For analog signals a balanced line
driver and differential PGA as the receiver have worked to 50m with
little signal degredation...

Explore the literature, Horowitz and Hill "The Art of Electronics" is an
excellent start...

Christopher Fowler wrote:
>
> Just for fun - Jameco has a 300 baud modem chip - 20 pin dip - $5.95
> http://www.jameco.com
>
> - Christopher
> ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
> Christopher Fowler
> HED, ChronoFish LLC
> .....christopherKILLspamspam@spam@ChronoFish.com
> ...
> {Original Message removed}

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