Terminal server? (Kinda.)

Drew Van Zandt drew.vanzandt at gmail.com
Fri Mar 4 14:33:13 EST 2011


At low speeds like 9600, I've personally run RS232 2500+ feet.  You
**should** use RS485 or something more robust, but what you should do and
what you have resources for don't always match.

--DTVZ

On Fri, Mar 4, 2011 at 2:17 PM, Jerry Feldman <gaf at blu.org> wrote:

> Do I read you correctly that you are going to individually wire each
> RS232 port?
> How are these locations going to be connected to the home office. I
> think that RS232 is a max of 50 ft or so. Or are these going to be
> connected to some in-store modem connected to the phone system or
> possibly with an in-store computer connecting to the Internet or to the
> home office via dialup.
> Back in the early 1970s we put POS (DEC PDP-8M) devices into all the
> Burger King stores with a low cost modem card.
>
>
>
> On 03/04/2011 01:55 PM, Ken D'Ambrosio wrote:
> > Hey, all.  My company's about to open up several locations across the
> > country.  We're going to have cash registers on-site -- good ol' RS-232
> > connections.  We're also getting software that can talk to these
> > computers.
> >
> > Now, I know RS-232 is fairly robust, but it strikes me that even it might
> > lose signal integrity over 3K miles.  What I'm thinking about (if anyone
> > has better ideas, please talk up!) is something like this:
> >
> > [Register] <- RS-232-to-USB -> [Wall Wart] <- VPN -> [Home office
> computer]
> >
> > So, as I see it, there are two minor issues:
> >
> > 1) Making the Wall Wart (e.g.,
> > http://www.linuxfordevices.com/c/a/News/100-Linux-wallwart-launches/ )
> act
> > as a terminal server, and
> >
> > 2) Having some sort of virtual RS-232 adapter on the Windows system
> >
> > Anyone got any suggestions?  Done anything like this?  Etc.
> >
>
>
> --
> Jerry Feldman <gaf at blu.org>
> Boston Linux and Unix
> PGP key id: 537C5846
> PGP Key fingerprint: 3D1B 8377 A3C0 A5F2 ECBB  CA3B 4607 4319 537C 5846
>
>
>
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-- 
*
Drew Van Zandt
Cam # US2010035593 (M:Liam Hopkins R: Bastian Rotgeld A:Walton Shipley)
*Artisan's Asylum Craft Lead, Electronics & Robotics
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