Re: [CAD_CAM_EDM_DRO] Print Servers for CNC

Bill,
use SBC as a physical interface. It is in turn connected to a "server" over
the network.
I/O card plugged into ISA bus of SBC can generate pulses for a drive.It also
can
generate analog signals for a servo, also whole bunch of other signals for
relays
and so forth.
Server in this case is a controller which does processing of G-codes.
Alex

----- Original Message -----
From: <ccq@...>
To: <CAD_CAM_EDM_DRO@yahoogroups.com>
Sent: Tuesday, February 25, 2003 2:33 PM
Subject: Re: [CAD_CAM_EDM_DRO] Print Servers for CNC


> Hi Alex;
>
> Because you need a physical interface to hook it all up to?
>
> Bill
>
> On Tue Feb 25 06:39:31 2003 alex wrote:
>
> >Why to use print servers when you can add networking app directly into
the
> >code?
> >Alex
> >----- Original Message -----
> >From: <ccq@...>
> >To: <CAD_CAM_EDM_DRO@yahoogroups.com>
> >Sent: Tuesday, February 25, 2003 9:45 AM
> >Subject: Re: [CAD_CAM_EDM_DRO] Print Servers for CNC
> >
> >
> >> Howdy Jeff;
> >>
> >> On Tue Feb 25 05:36:41 2003 Jeff Goldberg wrote:
> >> >
> >> >I don't think speed will be an issue with a modern print server as
they
> >are
> >> >generally the same throughput as a PC parallel port. The problems may
> >arise
> >> >from the ability to directly output signals on pins which are unusual
for
> >> >printers to use in the same way. Don't forget, they are not directly
> >> >coupled to your PC, so any fooling around that the programmer does
with
> >the
> >> >innards of your PC to generate or read signals may not work on a print
> >> >server.
> >> >
> >> >Also, Ethernet works on a collision based retransmission basis. On a
> >small
> >> >network this probably wouldn't cause a problem, but on a network with
> >lots
> >> >of traffic flowing, your data may be slightly delayed in reaching the
> >print
> >> >server which might cause issues.
> >>
> >> You're thinking of using this on a hub vs. a switch here, yes? There
are
> >single
> >> ether/parport units available, but I think that would tend to add delay
> >time,
> >> which is why I was thinking about a single NIC to triple parport
solution.
> >>
> >> >I'd tend to suggest sticking to popular name brands because driver
> >> >availability might be an issue if you change operating systems in the
> >future
> >> >(unless the price difference is too great, and you get involved up
front
> >> >with the assumption that it may end up as a paperweight sometime in
the
> >> >future)
> >> >Theoretically, they should work, from a practical standpoint, you'd
have
> >to
> >> >try it.
> >> >
> >> >Jeff
> >>
> >> Near as I can tell, the popular name brands only put out single port
> >units,
> >> but I don't have any comprehensive list to look at.
> >>
> >> Bill
> >>
> >> >-----Original Message-----
> >> >From: ccq@... [mailto:ccq@...]
> >> >Sent: Tuesday, February 25, 2003 7:28 AM
> >> >To: 2ccq@...
> >> >Subject: [CAD_CAM_EDM_DRO] Print Servers for CNC
> >> >
> >> >
> >> >The following URLs have a print server on them; That's a 10/100
> >ethernet
> >> >port feeding three parallel ports. Would these be usable for CNC
work?
> >> >Would the software be able to access them properly? I would think
they'd
> >be
> >> >speedy enough for smaller, slower machines, but.....
> >> >
> >> > http://www.pcbay.net/gen3parpor10.html
> >> > http://www.amastore.com/gen3porparpr.html
> >> >
> >> >Bill
>
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