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[aprssig] RJ45/RS232 Again

Fred Atkinson, WB4AEJ fred at wb4aej.com
Mon Mar 13 22:10:12 UTC 2006


Daron,

    Looks like a good approach.

    I'm home from school now.  Will give it a shot tomorrow and let you know
how it works.

    Regards,




Fred, WB4AEJ

----- Original Message ----- 
From: "Daron J. Wilson" <daron at wilson.org>
To: "'TAPR APRS Mailing List'" <aprssig at lists.tapr.org>
Sent: Monday, March 13, 2006 5:03 PM
Subject: RE: [aprssig] RJ45/RS232 Again


>
> >     I use Cisco rollover cables a lot because I teach computer
networking.
> > I want to make an adapter to adapt the leads in a Cisco rollover cable
to
> > the RS232 interface on a TNC-2.  Therefore, the same cable I use to
> > interface to Cisco devices I will be able to use [with this adapter] to
> > connect to the RS232 port on a TNC-2.
> >
> >     A rollover cable is called just exactly what the pin out describes.
> > It
> > is as follows:
> >
> >                      RJ45   to  RJ45
> >                        1    to    8
> >                        2    to    7
> >                        3    to    6
> >                        4    to    5
> >                        5    to    4
> >                        6    to    3
> >                        7    to    2
> >                        8    to    1
> >
> >     Generally, you have a DB9 to RJ45 female adapter on your computer's
> > serial port, a rollover cable, and then the other end of the rollover
> > cable
> > mates with the console (serial) port on a Cisco device.
>
> OK, so I quickly grabbed my Cisco console cable and DB 9 adapter, took it
> apart, and this is what I see:
>
>
> Cisco DB9       Modular    Rollover        Modular          TNC DB25
> to Modular      Plug       Modular cable   Plug             to Modular
> Adapter                                                     Adapter
>
>
> 1 - NC
> 2 --------------- 6 ------------------------ 3 --------------- 2 - TD
> 3 --------------- 3 ------------------------ 6 --------------- 3 - RD
> 4 --------------- 2 ------------------------ 7 --------------- 6 - DSR
> 5 --------------- 4,5 ----------------------5,4 -------------- 7 - SG
> 6 --------------- 7 ------------------------ 2 --------------- 20 - DTR
> 7 --------------- 1 ------------------------ 8 --------------- 5 - CTS
> 8 --------------- 8 ------------------------ 1 --------------- 4 - RTS
> 9 - NC
>
> I didn't take the time to build one up, but that is what looks logical to
me
> at first glance.
>
> Hopefully that is right, let us know one way or the other.
>
> Good luck!
>
> N7HQR
>
>
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> aprssig at lists.tapr.org
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