AVR-Chat

> From: Thomas Keller
> 

Hi Tom,

My RS-232 interface to the Butterfly is working now, but, to answer your
questions:

> .... Well, IIRC from the descriptions, all signals on the Butterfly can be
> brought out from pin headers.  I would assume this means the RS-232
> signals as well.

Nope, no access to the 'raw' USART ports (i.e.: to the ATMega169 pins) just the
'level shifted' pins.

> ....
>    Doesn't the Butterfly sport a small "breadboarding" area?  It
> shouldn't take much room to interface to a MAX232 package.

The Butterfly doesn't but the ECROS Butterfly carrier board I'm using does
(https://www.ecrostech.com).  

If I did have to run the Butterfly shifted pins through another stage to get it
to work I was going to mount a MAX232 on the carrier board and drive it from the
shifted pins using ground as the neg reference but I knew that this shouldn't be
required except in a case where the serial port on my laptop was RALLY picky.
Since others said it worked 'out of the box' I went back to square one with new
knowledge and it worked.

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