On 09/08/2019 09.37, Char Jackson wrote:
On Fri, 9 Aug 2019 08:44:50 +0200, "Carlos E.R."
wrote:

On 09/08/2019 03.32, Char Jackson wrote:
On Fri, 09 Aug 2019 12:00:56 +1200, Eric Stevens
wrote:

On Thu, 08 Aug 2019 16:26:28 -0500, Char Jackson
wrote:

A CNC machine is essentially a plotter. You're sending a series of
commands that ends with a command to execute. After that, the machine
goes to work. There's no real time control, at least not that I've ever
seen. Once executed, the machine goes to work and lets you know when it
has finished. It's not like you're sitting there, trying to guide it
with a joystick.

That's not always the case.

What's not always the case?

It would help to know what the machine is
and whether the problem is the downloading of a control program or the
direct control of the machine.

If it's a CNC machine, as it was described up thread, there is no
'direct control'. Is there a CNC machine that isn't controlled by a
computer? If so, would it still be considered to be CNC?

It depends if it is programmed by the computer, then the machine runs
the program on its own, like a plotter would do, or if its directly
controlled by the computer.

Either way, there is no 'direct control'. The distinction you're making
is the difference between sending all of the movement commands before
the program is executed or whether the commands are sent and executed
one at a time. Are we still talking about CNC machines or has the
discussion morphed?


The point is that direct control of a CNC machine over USB-RS232
converter _might_ be problematic.

--
Cheers, Carlos.