Okay, if you can do turnaround of at least 100 thousand output hardware
changes per second, I'm in. Quadrature outputs.
On 3/30/08, Neil Whelchel <[EMAIL PROTECTED]> wrote:
>
> Hello,
> I guess I should have been more specific when I was discussing the
> topology about connecting to a WAN, or even a non-related internal
> network. I had intended to imply that
> the WAN/LAN and the module network would be separate, one network card for
> each. However, with a proper VLAN switch, I feel that it MAY be possible
> to combine them, but I am not going to spend any time on that. ;)
> I have looked into a few realtime Ethernet papers and implementations such
> as Rtnet, Rether, and MicroNet, and it appears that Rtnet has most of
> what is needed for the host side (if not work just fine as-is). However
> for the I/O module side, the Ethernet stacks by Atmel and the like are
> nearly useless to me because they are targeted
> for much more complex (expensive) microcontrollers. (The compiled
> Atmel stack is nearly 3 times the size of the total flash of the
> microcontroller I am considering using.) Call me cheap, you'd be
> right, but why throw all of the complexity and money at it when it is
> likely that the cheaper, simpler approach is likely to provide the best
> answer.
>
>
> -Neil Whelchel-
> C-Cubed
> 760 366-0126
> - I don't do Window$, that's what the janitor is for -
>
>
> Can anything be sadder than work left unfinished? Yes, work never begun.
>
>
> On Sat, 29 Mar 2008, Jon Elson wrote:
>
> > Neil Whelchel wrote:
> >> Hello,
> >> I have joined this list because I an working on a project to convert my
> >> old CNC mill and manual lathe to EMC and I saw that there are what seem
> to
> >> be limited methods of interfacing EMC to the outside world, and I think
> I
> >> might be able to help in this area, among others. Sure there is the
> >> parallel port, and a hand full of (supported) ISA and PIC boards, but
> none
> >> of them seem to provide an optimal interface, and others are simply not
> in
> >> the right price range to make a project feasible. I have been tossing
> >> around the idea for a few months now of creating some very cheap (open
> >> source) microcontroller based I/O modules that communicate using
> Ethernet
> >> at the layer 3 level (Network Layer).
> > There is a real-time Ethernet driver already in existance, but
> > there are a number of restrictions on how it works. Also, these
> > restrictions means it won't work with off the shelf ethernet
> > micros and their off the shelf ethernet stacks, such as Atmel
> > and NXP make. At least, that was my understanding. Whether the
> > micro's library can be adjusted to make it work with the RT-net,
> > I don't know. The RT-net requires total isolation of the RT
> > part from the WAN with a router that can handle the RT-net
> > flavor, so that pretty much has to be another computer with two
> > ethernet cards/ports.
> >
> > I wanted to provide an ethernet interface to my boards, which
> > are parallel port based right now. But, this was just over my
> > head and beyond the time I had available.
> >
> > Jon
> >
> >
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