Serial connection not working
2007-12-25 10:47:00
The problem was somehow the 3 lines and the protocol being used in my
connection (not the cable).
We was using DTS/CTS protocol, and I switch to DTS/CTS (3 lines). Now
everything appears on my screen.
Bye
Christian Pinheiro
Arthur Darren Dunham wrote:
>
> >
> > This is a multi-part message in MIME format.
> > --------------157DE01AD4A794ECB553B5EA
> > Content-Type: text/plain; charset=us-ascii
> > Content-Transfer-Encoding: 7bit
> >
> >
> > Hello,
> >
> > I have a Karitek 4100 console connected to my Enterprise 250.
> > I'm using a NULL MODEM cable to connect host to console.
> >
> > I can see everything after "configuring network devices: hme0" message.
> > I'm concered about why does the previous messages are not being showed
> > to the console.
> >
> > I can't see the memory initialization, the OpenBoot banner, etc
> >
> > I talked with Karitek technical support, and they told me it can be
> > cable problems, but, you know, I can see the messages after "configuring
> > network..".
> >
> > I read the Sun E250 Owner's Guide, on page 273, and compared the pins
> > with the pins expect by Kariteck console, and its ok (Its STANDARD!!)
> >
> > What is more interesting is that when I'm using a serial cable and a
> > tip connection to other machine, I can see all the messages on boot. But
> > using the same cable connecting to the console, I just can see messages
> > after "configuring..."
>
> Based on the fact that you can see them all with another console, I'd
> assume that the Kariteck is trying to be too smart.
>
> Until the OS gets going, the SUN probably doesn't assrt DTR or such. My
> guess is the console is blocking input until the line is asserted.
>
> You'd need a 'breakout box' to examine the lines to verify.
>
> The solaris console only needs 3 lines (tx, rx, gnd). While other
> communications may use flowcontrol, the OK prompt and OBP don't.
>
> If you just have a 3 line cable, everything would probably work okay.
> Or, you could try to get an adapter that tied DTR high if that turns out
> to be thr problem.
>
> Or, see if the console has a setting to 'Ignore RTS' or something like that.
>
> --
> Darren Dunham ddunham@taos.com
> Unix System Administrator Taos - The SysAdmin Company
> Got some Dr. Pepper? Santa Clara, CA
> < Please move on, ...nothing to see here, please disperse >
- text/x-vcard attachment: Card for Christian Pinheiro
Comments
Got something to say?
You must be logged in to post a comment.
