AVR-Chat

To Clarify -

Bidirectional RS232 requires at least 3 connections - Rx,  Tx, and  
Common or Ground. If your cable has no ground wire, it could have  
worked through the JTAG ground. Removing JTAG would then cause the  
RS232 to fail. Check your cable with an ohm meter or continuity  
checker to verify that (pin 5, I think, on DB29 cables).

Jim

On Jan 15, 2008, at 9:14 AM, David VanHorn wrote:

> > > Is there a ground connection between the PC and the system when  
> the
> > > debugger isn't plugged in?
> > >
> > Yes it should be grounded.
>
> I agree that it SHOULD be, but the question was wether it IS.
>
> In theory, there is no difference between theory and practice. :)
>
> 



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