I've been bread boarding some circuits and mulling over the PWM to 10V connection.
Just to review, my project here is to take a WIN-XP (7) MACH3 parallel port based BoB system and convert it into LinuxCNC without changing any wiring. I've had that working without any problems. I can get faster than parallel port stepping when I borrow my USB SmoothStepper from my CNC Router. The equivalent approach was to buy the MESA 7i92H Ethernet to Parallel Port card plug the cable in place of the parallel port from the PC. However the problem is that under MACH3 I can select which pin is the PWM and which pin is the direction and I can't do that with the 7i92H. I've gone through the pin files that configure the MESA They all assign IO Connections for P2 Pin# I/O Pri. func Sec. func Chan Pin func Pin Dir 14 1 IOPort PWM 0 PWM (Out) And in 7i92_C11Gx2D.pin 16 5 IOPort None Or in 7i92_R990x2D.pin 16 5 IOPort PWM 0 Dir (Out) Reading the docs I can't figure out how to swap the pin functions and create a new pin. Has anyone writing a step by step guide? Thanks John > -----Original Message----- > From: John Dammeyer [mailto:[email protected]] > Sent: September-16-19 9:21 AM > To: 'Enhanced Machine Controller (EMC)' > Subject: Re: [Emc-users] MESA 7i92H Power > > 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 > > > > _______________________________________________ > > Emc-users mailing list > > [email protected] > > https://lists.sourceforge.net/lists/listinfo/emc-users > > > > _______________________________________________ > Emc-users mailing list > [email protected] > https://lists.sourceforge.net/lists/listinfo/emc-users _______________________________________________ Emc-users mailing list [email protected] https://lists.sourceforge.net/lists/listinfo/emc-users
