Boards are on the way. Should be here Wednesday. Total cost so far, unless
there are duties and taxes, is $22 Cdn for 5 boards.
If all goes well the ENABLE button on the LinuxCNC display should now be
able reset the HP_UHU drives, I'll have 5V power for the MESA 7i92H, the FAULT
signal from the STMBL will be wire OR'd with the FAULT from the two HP_UHU
drives and the now isolated STEP/DIR/ENALE signals will be RS-422 from an RJ45
socket to the STMBL so I can use a short Shielded Ethernet Cable.
Next step is to get the DB-25 to RJ45 adaptor board made so the Harmonic
drive doesn’t have to sit 18" from the control cabinet. And then finish the
crucible so I can cast the mount and faceplate for the Harmonic Drive.
This weekend I also designed a third board that isolates the PC
PWM/DIR/ENABLE signals and translates the PWM to 0V-10V for the spindle speed
control. This is for the Bergerda AC Servo which will eventually also be run
with STEP/DIR off the second port of the MESA7i92H but I need to design an
adaptor board for that yet since the port pins aren't all used on the second
PMDX-126 BoB. And my goal is first to transfer a single parallel port based
MACH3 system into LinuxCNC.
I'd have to buy a custom proprietary board from PMDX to use all the P1
parallel port pins and they consider that part of the board connection
proprietary for their own modules. So I can't design anything that would plug
into it. Instead I'll just design a board for the P1 Connector directly to the
MESA and I won't recommend PMDX. Their loss.
John
> -----Original Message-----
> From: andy pugh [mailto:[email protected]]
> Sent: September-15-19 3:20 PM
> To: Enhanced Machine Controller (EMC)
> Subject: Re: [Emc-users] MESA 7i92H Power
>
> On Sun, 15 Sep 2019 at 00:44, John Dammeyer <[email protected]>
> wrote:
>
> >
> > Done that before for RS232 to RS485 dongles. What do yours do?
> >
>
> Those were RPi bidirectional GPIO level shifters,
>
> --
> 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, 1916
>
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