[SunHELP] Netra 1405 console/serial problem(?)

[Peter Stokes]

Hi

First make sure that you have set-defaults at ok on both systems in case
you have modem control enabled on the first system etc.

The other explanation is that I have seen some RS232 ports which are
sensitive to the voltage levels sent to them. Some vendors use +-5V for
RS232, where you would normally expect >+-5V. This tends to work in most
cases, but if the chip is on the edge it will not work.

What happens if you connect and then powerup the 1405, do you get output
at all?

Peter

On Tue, 2004-02-03 at 05:23, Jacob Zehnder wrote:
> Here is the situation..  I have 2 identical Sun Netra 1405s stacked on top
> of each other.  I have a Lantronix console server.  I take an rj45 cable
> with rj45<->db25 converter(provided by Lantronix) into serial A on top Netra
> 1405 and direct attach the port while logged into Lantronix.... NOTHING,
> zilch.  I then take the exact same cable and plug it into the Netra 1405
> under the first and again direct attach the port while logged into Lantronix
> and it works great.  Ok, so my first thought is somethings up with the
> serial A port on the first 1405, so I now take my laptop db9<-null
> modem->db25 and plug it into serial A port on the machine and question and I
> can connect to the port fine.  So its not a bad cable provided by Lantronix
> because it works on the machine below with same config.  Its not the port
> because I can plug my laptop into that port and have it work brilliantly.
> It's a very strange problem for me and if anyone else has come across it
> then thanks in advance!
> 
> -Jacob Zehnder
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