[oopic] Re: Serial communication between two oopics

--- In oopic@yahoogroups.com, "Mike Smith" <msmith@...> wrote:
>
> Thanks Richard -
>
> > Or, skip the serial experience altogether. Serial communications
> > isn't something the OOPic does well.
> >
> > Read Chapter 12 of the Programmer's Guide and use Dynamic Data
> > Exchange (oDDELink). This will allow each OOPic to manipulate
> values
> > in the other OOPic.
> >
>
> I would like to skip the serial stuff and use i2c / DDE as well,
but
> the OOPics will be separated from each other by some distance and
> everything I've read is that i2c should only / can only be used for
> very short distances.
>
> I'll plan on getting the level shifter for the S board, and getting
> each to talk to the PC first.
>

Considering the r-board actually uses 0-5v levels for RS232 [DB09
connector], you could probably get by with just simple inverters on
the s-board. At least for testing pusposes. Still need the null-
modem, or switching pins 2+3 in DB09 cable.

Wonder how much 4000' of copper cable costs these days? :)

> I'm hoping that at RS232 levels I can get the distance I need. If
> not, I was planning to look into RS232<->RS485 converters
(Wikipedia
> says RS485 can go 4000ft!), or using something like a Prizm
MicroMux
> (http://www.prizminc.com/pdf/DS_micromux1.20.2004.pdf) to convert
> RS232/RS485<->Fiber between the cards. (I suspect those fiber
modems
> are pricy though!)
>
> Ah, but I'm getting ahead of myself. First, I'll try to get the
> serial basics down and order the MAX232 for the S card.
>
> Thanks for the help. I'll keep the group posted if I can get any
of
> this "long distance" serial stuff working.
>

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