You might also consider RS-422 from the DTC's to HP Terminals using UTP
cables Cat-5.
That would increase your distance dramatically.  A downside is having to use
5 pin ATP connectors.

Tony Peters     Ph  416 240-3695 Fax 416-249-3193
Project Manager-New Technology
S&C Electric Canada Ltd     [log in to unmask]

My words are from my thoughts and no-one else, because they have no idea
what I think.  Good thing too.



> -----Original Message-----
> From: Simonsen, Larry [mailto:[log in to unmask]]
> Sent: Monday, January 24, 2000 5:46 PM
> To: [log in to unmask]
> Subject: Re: Distance Limitations
>
>
> We have used telephone ( cat-3) cables 2000 feet from one end
> of our office
> to the other end of a machine shop.  19200 baud with no
> reported problems.
>
> -------------------------------------------------
> Larry Simonsen                Phone: 801-489-2450
> Flowserve Corporation     Fax: 801-491-1750
> PO Box 2200                    http://www.Flowserve.com
> Springville, UT 84663      e-mail: [log in to unmask]
> -------------------------------------------------
> All opinions expressed herein are my own and reflect, in no
> way, those of my
> employer.
>
>  -----Original Message-----
> From:   Ray Cotton [mailto:[log in to unmask]]
> Sent:   Monday, January 24, 2000 3:08 PM
> To:     [log in to unmask]
> Subject:        Re: Distance Limitations
>
> I have also used RS-232(shielded) over 300 feet, not a problem
>
> Best Regards
> Ray Cotton
> Business Consultant
>
>
>
>  -----Original Message-----
> From:   HP-3000 Systems Discussion [mailto:[log in to unmask]]  On
> Behalf
> Of Neal Kazmi
> Sent:   24 January 2000 20:33
> To:     [log in to unmask]
> Subject:        Re: Distance Limitations
>
> At 02:08 PM 1/24/00 -0600, you wrote:
> >What are the distance constraints on DTC's as opposed
> >to the limitations on a LAN? I have a second building
> >going in that will be used primarily for shipping and
> >as such need only have 2-3 terminals, but is stretching
> >the limit on my LAN. If I could get another 100 yds in
> >some fashion I'd be ok.
>
> I'll answer this the two ways DTCs can communicate:
>
> For the network side, usually I get above 100 Meters on a Cat
> 5 cable.  You
> should be able either switch the DTC to twisted pair or use a
> transceiver.
> If you are going to add a transceiver and cost is not a
> problem, use Fiber
> Optic (10BaseF or FOIRL) cable between the buildings. There are also
> twisted pair extenders for 10BaseT. Extending the 10Base2
> (ThinLAN) beyond
> the specification can affect everyone on the segment.
>
> For serial connections, most specifications show 25 feet. I have seen
> people use 1000+ feet of cable for RS-232 from an HP terminal
> to a DTC. I
> have seen people fry cards in the DTC when the ground
> potential of the two
> buildings was very different (Denver).  Always use some form
> of electrical
> isolation between building unless you are assured that the
> grounds are the
> same. Serial cables can be isolated or extended with Fiber
> Optic also, but
> if you are going to that expense, use a network cable.
>
> Hope it helps,
> neal
> 800-682-0200
> <http://www.minisoft.com>
>