Re: [Emc-users] Dual boot for WIN-XP and LinuxCNC

[Peter C. Wallace]

On Sat, 1 Jun 2019, John Dammeyer wrote:

Date: Sat, 1 Jun 2019 13:46:19 -0700
From: John Dammeyer <jo...@autoartisans.com>
Reply-To: "Enhanced Machine Controller (EMC)"
    <emc-users@lists.sourceforge.net>
To: "'Enhanced Machine Controller (EMC)'" <emc-users@lists.sourceforge.net>
Subject: Re: [Emc-users] Dual boot for WIN-XP and LinuxCNC
Thanks Peter,


Therefore under LinuxCNC I need something with say an Ethernet
interface
that has two ribbon cables compatible with PC Parallel port pinout so the
latency isn't an issue



http://store.mesanet.com/index.php?route=product/product&product_id=303
&search=7I92H

is available (just different connector arrangement, still 2x LPT compatible
pinouts)


So then the question is:

With LinuxCNC and a latency measurement in the 25030 to 27420 can this board 
generate the 55kHz stepping pulses?

The steps are generated in hardware so the step rate is independent of latency
Maximum step rate is ~10 MHz. The host needs to run the Servo thread (typically 
at 1 KHz) reliably


I have two DC Servos, 3200RPM.  250 line encoder, and both 3:1 (X) and 4: 1 (Y) 
 reduction to 5TPI screws.

Math says 3200 RPM 53.3333  RPS.  With 4x 250 line encoder is 1000 lines per 
rev so 53333.333kHz stepping pulses.

I expect this will work easily with LinuxCNC.  Yes?


Yes, with the uspace version/Preempt-RT kernel  ( Debian Stretch ISO is easiest 
way to get this )

It might require special firmware to match the PMDX pinout ( usually just a 10 
minute or so job for me )

And do you have a driver for WIN-XP and MACH3 by any chance?


No, that would require different firmware ( buffered motion rather than real 
time commands from LinuxCNC )

Thanks
John




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Peter Wallace
Mesa Electronics

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