Re: Dead serial ports?

[carbide@egine.com]

A.J. wrote:
> HAPPY DAYS AND JUBILATION!!!!!
>

Congrats!

>
> 1. DB25 male and DB25 female connectors have DIFFERENT pinouts!  The
> pin numbers are in the opposite order so that they can mate
correctly.
>

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. 

Have fun. You can really hose files over now.
-Paul