[foxboro] FW: VT100 Emulation -- UPDATE
- From: "Jones, Charles R. \(Chuck\)" <Chuck.Jones@xxxxxxxxxxxxxxx>
- To: <foxboro@xxxxxxxxxxxxx>
- Date: Wed, 20 Sep 2006 09:30:31 -0400
Thanks, Everyone
In case someone is looking up this file in the archives someday, I
wanted to post an update. The problem turned out to be the null modem.
I purchased it the first day. Since it was new, I did not check it out
well enough before looking for other problems. I don't know that it was
bad, per se, since I was able to use it successfully to do other things.
But, an Asynchronous Modem Eliminator (isn't that just a marketing
phrase for "null modem"?) purchased from Black Box "eliminated" the
problem. The Black Box model is a 25-pin device on both ends and ties
together several pins unused by the 9-pin port on the back of a laptop.
The first null modem was a generic device from the local electronics
store. It was 25-pin on one end and 9-pin on the other, so I thought it
would be well suited to our needs. I never did see a schematic for the
internals. But, I suspect the first null modem ignored the pins on the
large end that were not connected to the small end.
For the future archive digger, the successful solution was:
- put the 25-pin Asynchronous Modem Eliminator (null modem) was attached
to the connector that used to connect to the Wyse terminal
- connect a 25-to-9 pin RS-232 adapter to the null modem
- connect to the laptop
- use any terminal emulation program that will emulate a VT100
- my connection configuration is:
- 9600 baud
- 8 bits
- None (parity)
- 1 stop bit
- Xon\Xoff
What was the "one little trick" I was looking for? I think it was using
a 25-pin to 25-pin null modem instead of a 25-pin to 9-pin null modem.
The web site for the one I used is:
http://www.blackbox.com/Catalog/Detail.aspx?cid=381,1453,1490&mid=460
Thanks to all who helped. I had a couple of people who called me on the
phone to help. This list is great.
Chuck Jones
> -----Original Message-----
> From: Jones, Charles R. (Chuck)
> Sent: Friday, September 01, 2006 10:34 AM
> To: 'foxboro@xxxxxxxxxxxxx'
> Subject: VT100 Emulation
>
> Friends,
> I lost a Wyse VT100 compatible terminal a couple of weeks ago.
> Generally, the only time it was used was during tape backups of the
> AP. Before buying a replacement, I want to try to use my laptop to
> gain access. I have B0193AC -Rev T in front of me, but I have had no
> luck so far. (Is there a more appropriate one I should use instead?)
> I searched the archives of this list last evening and found some very
> interesting information--on other subjects related to this issue. I
> have checked the cables--several times. I have put a little doo-dad
> in series between the nine-pin connectors at the back of my laptop. I
> know that the TD LED is green when I am disconnected, but it goes to
> red when I try to connect. I tried using a null modem, it didn't
> help. I am trying the laptop side-by-side with a working Wyse
> terminal on a test bed, so I am certain of the pre-existing wiring and
> the responsiveness of the test AP.
>
> Before I lose what's left of my sanity, I thought I would ask a few
> questions. Does anyone know for certain that this cannot be done?
> Has anyone done this before? Does anyone know "the one little trick"
> that makes this work?
>
> I have one last question today. Why is it that the simplest
> things--the "Pssht, heck yeah I can do that!" problems--are always the
> hardest ones to figure out?
>
> Chuck Jones
> Automation Technologist
> Tate & Lyle -- Lafayette South Plant
> 765.477.5324 - Office | 765.586.5290 - Cell
>
>
>
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