On Sat, 14 Apr 2012, Kirk Wallace wrote: > Date: Sat, 14 Apr 2012 14:45:40 -0700 > From: Kirk Wallace <kwall...@wallacecompany.com> > Reply-To: "Enhanced Machine Controller (EMC)" > <emc-users@lists.sourceforge.net> > To: LinuxCNC Users List <emc-users@lists.sourceforge.net> > Subject: [Emc-users] G540 Test Update > > I set up Dan's G540 today and used it with three different ports. A > motherboard port which worked okay, but showed a bit of a saw toothed > wave form, so it seems the G540 pump input draws a fair amount of > capacitive load compared to the pin 16 output source capability. > > I then used a Rosewill dual port PCI card with a Moschip 9815 on it. > http://www.datasheetarchive.com/indexdl/Datasheet-082/DASF0042609.pdf > > I got a pump signal out of it but the the ON voltage didn't get much > above one volt. Switching from SPP to EPP didn't make any difference. > > I then used a Startech dual port PCI card (bottom of page): > http://wiki.linuxcnc.org/cgi-bin/wiki.pl?Startech > > and got the pump to work in EPP but not SPP, which was expected. > > Using a 1k Ohm pull up to +5V on the Rosewill card got the G540 to show > a green LED, but the wave form was similar to the non pull-up wave (OFF > = 0v, ON = 1V) but with an upward ramp during the ON time that got into > the 2 Volt range. There was no change between SPP and EPP. A 660 Ohm > resistor pulled the ramp up higher, but 5V / 660 Ohms = 7.5 mA and is > starting to get into an amp range that could get interesting for pin 16. > > With my current bench setup, I need three hands to get a wave form on > the oscilloscope and take a picture, so I'll need to upgrade my setup in > order to post the wave forms. I hope to do that soon. > > What comes to mind from my first test is that the Roswill may never work > with the G540 without an external pull-up. These 9815 based cards are by > far the most popular, so either Mach3 people are not using PCI cards > with the G540, or Mach3 is doing something other than setting EPP mode? > > I found that Stepconfig worked well for setting up the pump. There is a > G540 short cut button that seems to enter the signal timing and some > other settings, but I needed to change a few pin assignments. Stepconfig > sets up the pump to come on when LinuxCNC is out of E-stop. I don't see > a problem with this, but if needed, it's easy to change the > configuration files to get full time pump regardless of e-stop status. > > -- > Kirk Wallace > http://www.wallacecompany.com/machine_shop/ > http://www.wallacecompany.com/E45/index.html > California, USA > > > ------------------------------------------------------------------------------ > For Developers, A Lot Can Happen In A Second. > Boundary is the first to Know...and Tell You. > Monitor Your Applications in Ultra-Fine Resolution. Try it FREE! > http://p.sf.net/sfu/Boundary-d2dvs2 > _______________________________________________ > Emc-users mailing list > Emc-users@lists.sourceforge.net > https://lists.sourceforge.net/lists/listinfo/emc-users >
This does show the the G540 charge pump circuit needs a re-design. Theres really no reason it should not "just work" with _any_ parallel port in any mode. (if you look at the various Mach forums, a lot of people just gave up and turned the charge pump off) Peter Wallace Mesa Electronics ------------------------------------------------------------------------------ For Developers, A Lot Can Happen In A Second. Boundary is the first to Know...and Tell You. Monitor Your Applications in Ultra-Fine Resolution. Try it FREE! http://p.sf.net/sfu/Boundary-d2dvs2 _______________________________________________ Emc-users mailing list Emc-users@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/emc-users
