AVR-Chat

Chuck,

Did you strap some pins on the pc connector side? Look at the AVRISR
schematic to see what they did.

I think I got this right...

From the PC ...

On the 9pin connector that plugs to the PC, it is 4-6, 7-8,  ( 5 gnd, 2
receive data by PC (transmit from Butterfly) and 3 transmit from PC (receive
by Butterfly) ).

Jim

----- Original Message ----- 
From: "Chuck Hackett" <egroupscdh@up844.us>
To: <AVR-Chat@yahoogroups.com>
Sent: Monday, March 13, 2006 7:27 PM
Subject: RE: [AVR-Chat] RS-232 Butterfly connection


> > From: Thomas Keller
> > ....
> > > The only thing I can think of is that the signal does not have enough
swing
> > > above and below zero.  My scope shows Mark as about -2.75v and Space
as
> > about
> > > +2.25v.
> > >
> >    This is probably not enough voltage swing for the RS-232 receivers in
> > your PC port.  You might want to insert a TI75232 (MAX232 clone, much
> > less expensive) in between your Butterfly and your PC.
> >
> >   I am expecting to have a Butterfly here soon myself, so i am looking
> > forward to the same sort of fun you're havingm Chuck.
>
> Hi Tom,
>
> I was thinking that myself but I don't think I can get at the proper
points on
> the Butterfly as it's multi-layer and SMD stuff that I don't have the
equipment
> to get to.
>
> But, since they advertise an RS-232 interface you'd think that it would
work
> with a (fairly) modern laptop ... arrgggg ...
>
> I also tried it with a USB serial adapter that I have but no luck.
>
> Can a MAX chip be run from the power received from the laptop via DTR or
> something and driven by the "partially" level-shifted signal available
from the
> Butterfly?
>
> By the silence on the list, I assume no-one has ever received data from
the
> RS-232 interface on a Butterfly?
>
> Cheers,
>
> Chuck Hackett
> "Good judgment comes from experience, experience comes from bad judgment"
> 7.5" gauge Union Pacific Northern (4-8-4) 844
> http://www.whitetrout.net/Chuck
>
>
>
>
>
> Yahoo! Groups Links
>
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>