[PLUG] (serial) terminal condition

[Pluimer, Randal T]

LOL. I have one of those stuck in my drawer too. havent used it in ages
though.

-----Original Message-----
From: Anthony Schlemmer [mailto:aschlemm at attbi.com]
Sent: Wednesday, November 20, 2002 3:47 PM
To: plug at lists.pdxlinux.org
Subject: Re: [PLUG] (serial) terminal condition


Do you have access to one of those little "Christmas Trees" as we used 
to call them. They're RS-232 testers with 7 LEDs on them and they have 
a male DB25 connector on one side and female DB25 connector on the 
other. It shows the following signals: TD, RTS, DSR, CD, RD, CTS, DTR. 
I got mine years ago at Radio Shack quite cheaply when I did some part 
time system admin work on a System V Rel 1.5 system that was connected 
to dumb terminals.

I even have what they call a "Breakout Box" called "Easy Bob" that has 
18 LEDs, 25 little switches on it, and bunch of jumper wires for 
connecting different pins together across the unit. I used to use the 
box to help me figure out what pins to use when I had no documentation 
to work with. 

Sure there are certain basic pin connections for RS-232 but back in the 
old days (1980's) there were some strange devices out there that 
required some interesting pin configurations. This sort of equipment 
may be rare now since everything has moved over to ethernet for the 
most part although for debugging the kernel and stuff a serial port and 
terminal is still required I think.

Tony

On Wednesday 20 November 2002 15:26 pm, Jeme A Brelin wrote:
> On 20 Nov 2002, Russell Senior wrote:
> > a) I once had trouble talking to a device, I think it was a Cisco
> > 675, until I turned _off_ all flow control (hard and soft);
>
> That's the one flow control setting I have NOT tried...
>
> > b) maybe you aren't supposed to cross transmit and receive (i.e.,
> >    whatever document you are looking at didn't intend you to).
>
> Well, according to the manual, pin 1 of the RJ45 is transmit and
> labelled as "Output".  This tells me that it's not the pin to be
> wired TO a transmit on the far end, but to a receive.  Hopefully
> that's the correct interpretation.
>
> I suppose there's a chance I wired the whole thing completely
> backward...  oh hell.
>
> Any more suggestions?
>
> J.

-- 
Anthony Schlemmer
aschlemm at attbi.com



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