Re: Dead serial ports?

["A.J." <naijireja@yahoo.com>]

carbide@egine.com wrote:
> A.J. wrote:

...

> Yes- the pin numbers are molded into the plastic, though I need a
> magnifier to read 'em. Go with the numbers. I usually sketch it all
out
> and double check, because it is so easy to make a mistake.
>
> > 2. When building a null modem adapter, in order to get the pins
from
> > the first DB25 female aligned properly with the pins of the second
> DB25
> > female, BE SURE THEY CROSS OVER! If you wired them straight
through,
> > chances are one of the DB25's is using the incorrect inputs.
> >
>
> This is because the "send" wire from one computer goes to the
"receive"
> wire of the other.  Like phones- if your mouthpiece connected to the
> other phone's mouthpiece, they couldn't hear you. Your mouthpiece
> connects to their earpiece, and vice versa. Same with null-modem
> cables.

The first time I tried to build the null modem adapter, I had the
pinouts in front of me.  Because I forgot to cross the wires over, I
ended up with a weird configuration (i.e. pin 2 was supposed to go to
pin 3, but ended up going to pin 11 instead...)

--A.J.