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