On Mon, 18 Apr 2022, andy pugh wrote:
Date: Mon, 18 Apr 2022 00:59:07 +0100
From: andy pugh <bodge...@gmail.com>
Reply-To: EMC developers <emc-developers@lists.sourceforge.net>
To: EMC developers <emc-developers@lists.sourceforge.net>
Subject: Re: [Emc-developers] curious about the ethernet protocol
On Sat, 16 Apr 2022 at 00:42, Torsten Curdt via Emc-developers
<emc-developers@lists.sourceforge.net> wrote:
IIUC the GCODE interpreter runs in the non-realtime part. It sends the step
instructions to a card to execute the steps. This is obvious when using a
LPT port, but how does this work via Ethernet?
Snip-------------------------------------
As far as I know an ethernet smoothstepper does not do this. I don't
even think that they "buffer" as is often suggested. In fact I think
that they move all of the "tc" on to the hardware. So probing and
spindle-synched motion is handled inside the card, not on the host
controller.
An external card with a TC probably has multiple levels of buffers...
(back when we made some MACH 3 compatible hardware, it was in fact buffered
PVTA motion so Mach3 did the trajectory planning and the external hardware
just played out a PVTA sequence from a FIFO)
--
atp
"A motorcycle is a bicycle with a pandemonium attachment and is
designed for the especial use of mechanical geniuses, daredevils and
lunatics."
?? George Fitch, Atlanta Constitution Newspaper, 1912
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