RE: [Etherboot-developers] Serial Port Debugging

[Vasil V. <va...@sy...>]

On Mon, 20 Jan 2003, Timothy Legge wrote:

> > > I had purchased a 9 to 25 pin null modem serial cable, nothing
> seemed to
> > work.
> >
> > Where do you connect the 25 pin end?
>
> Particularly good question.  Here is what I have learned about serial
> debugging:
>
> 1) If you have two 25 pin ports on the back of your computer, ensure
> that you know which one is the printer port.  Yes, even if you think you
> know, open the case and look to be sure.
>
> 2) If you are going to buy a num modem cable or adapter ensure that you
> know how it should be wired.  Do not buy a cable or adapter that does
> not have wiring information unless you verify it with a meter.  In fact,
> insist on it even if it is labeled.
>
> So after spending more money than I want to think about and making
> beginner level mistakes I have finally gotten serial debugging working.
> Now what was it I needed it for??

Good points. I have experienced similar problems about wiring but with RJ45
connectors:

3) There is no standard for converting RJ45 to DB9 or DB25 for serial lines.

-- 
Vasil
~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
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