Re: [CAD_CAM_EDM_DRO] Re: Re: EMC, ISA and other Questions...

Ray,
I made a program to transmit DRO data from Mauch/Kulaga board to another
machine in real time.

It can be helpful if Linux machine doesn't have ISA slots, then it can be
networked
to a cheap old computer which does DRO readout. Then closed-loop operation
can be facilitated. It runs in DOS.
Also it can address expandability issue, which is always in the back of my
mind.

Going further, this "old" computer or SBC, can have DRO card and at the same
time it can control steppers/servos in a closed loop. Being networked to a
"main" computer running Linux/EMC it can get "macro" commands based
on a postprocessor results.

I wonder if EMC has breakout points for implementing this.

Best regards, Alex

----- Original Message -----
From: Ray Henry <rehenry@...>
To: <CAD_CAM_EDM_DRO@yahoogroups.com>
Sent: Tuesday, January 21, 2003 8:01 PM
Subject: [CAD_CAM_EDM_DRO] Re: Re: EMC, ISA and other Questions...


>
> > From: "alex" <telecomt@...>
> > Subject: Re: EMC, ISA and other Questions...
> >
> > Ok, started to understand - better late then never.
> > Interpreter reads the G-code and translates it into the commands to be
> > executed by the
> > machine. Commands are parsed into C routines which control axes of
> > the machine.
> > Please correct me if I'm wrong.
>
> Very close, Alex.
>
> The interpreter builds an internal world model based on the g-code that
> it has read. From this world model, it figures out what needs to happen
> next in order for the model to be changed to match the new block of code.
> >From those changes it generates a set of Neutral Message Language (NML)
> words that it passes on to whatever might be listening.
>
> In an average EMC, there are task, motion, IO, and interface routines
> also running. These listen to the NML channels and react to those
> commands from the interpreter. They can also issue commands to each
> other and to the interpreter. It matters little whether all of these
> routines are running on one computer or several.
>
> Yes there are ms-dos specific parts left in the code from some versions
> that were compiled for that OS. My guess is that you'd have to search
> them out and bring them up to date with what's happening now, both with
> dos and emc.
>
> I would guess that a real-time linux kernel could do most anything that a
> dos kernel could do, including running on a 386 chip set. I saw a small
> stepper hexapod that used a stock EMC and was running with a 486. The
> encoder reader that you have in mind here should be easily able to run as
> well with Linux as it does with dos. You are no doubt correct that if
> it read four encoders at 200k ppr, it wouldn't have much left for a gui.
>
> Ray
>
>
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