Re: [Gumstix-users] is my connex a brick?

[Dave H. <dhy...@gm...>]

Hi Brad,

On Fri, Jul 25, 2008 at 6:31 PM, Brad Fuller <bra...@gm...> wrote:
> I'm having quite a time trying to talk to a connex 400xm-bt. I've been
> able to talk to it yesterday (after fooling around) via a serial
> connection on a console-st board. It's also been a mystery how I got
> it to talk, but now nothing I do will work. I've tried minicom and
> kermit  on linux and putty on windows  - with settings according to
> the website (115200, 8N1, no control flow)

Also check to make sure that the gumstix and the console-st board are
well seated together. If you don't have them screwed together with the
screws and spacers kit then they might come apart.

> I didn't try to reflash the fs nor u-boot. Is there any thing I can do
> to check - or start from scratch - or kick it in the butt? Any
> pointers are much obliged. It might be the serial connector that a
> poster mentioned are flakey?

You should measure -5v (or thereabouts) on the Tx line of the console port.

When I have serial connections I'm unsure about, I start at the
computer and short out the Tx and Rx signals. You should be able to
run your comms program and see what you type. If you disconnect Tx
from Rx you should stop seeing wht you type.

Then I'll plug in the serial cable and repeat by connecting Tx and Rx
at the end of the serial cable.

Then I'll plug in the board, and connect Tx and Rx across the back of
the board (with the board unpowered).

-- 
Dave Hylands
Vancouver, BC, Canada
http://www.DaveHylands.com/