AVR-Chat

> 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