On Monday 22 June 2015 10:16:07 sam sokolik wrote: > I think we bought a few of those breakout boards. They seem to work > quite well. > > https://www.youtube.com/watch?v=HPzow8L1dxw > > sam
I just bought a slightly different one that doesn't have obvious opto's except for inputs. I'll report on it when it arrives. > > On 6/22/2015 9:05 AM, Dave Caroline wrote: > > I too have seen bad break out boards but recently got one of > > http://www.ebay.co.uk/itm/171802685847 > > > > There seems to be a couple of versions of it on fleabay only tried > > the one > > > > this has direct 74hct driving the opto in the driver rather than > > have its own output optos, sensible in my opinion, which also means > > it can drive high or low side optos > > > > Dave Caroline > > > > On 22/06/2015, Gene Heskett <[email protected]> wrote: > >> On Monday 22 June 2015 03:57:06 Steve Stallings wrote: > >>> Proceed with caution. This board uses slow opto-couplers > >>> in the data port output signals that are typically set > >>> up as step and direction outputs. Many users have reported > >>> problems due to the inability to pass fast signals. > >>> > >>> Additionally some variations of this board connect the > >>> ground on the output sides of the opto couplers to the > >>> same signal as the ground on the input sides and thus > >>> do not actually isolate the ground path. > >> > >> That much is documented. As for the slow opto's, that doesn't > >> surprise me. While it looks well made, its lack of docs, real docs > >> that spec those speeds etc, makes me think its a $3.75 card in > >> Kowloon. > >> > >> Yesterday I ran stepconf on the normal parport, with my pocket > >> scope watching the outputs, and I get good solid direction > >> reversals on the "dir" pins, but zip on the step pins. I suspect > >> that without an adjustable reset time, its not going to work even > >> if this box has horrible latency, restricting it to a 45u-s base > >> thread or slower. > >> > >> The docs tend to say both are open collector (OC) and show a > >> pullup. This is with a 5v 1 amp supply connected to the 5 & gnd > >> pins, and the jumpers on, which commons both grounds and 5 volt > >> lines. I don't think the step pulses are wide enough to get thru > >> those opto's, but will get out the big scope and check today. > >> > >> I am in love with the C1G from cnc4pc as it has all these nice > >> pretty leds to tell you whats going on, and the opto's are faster > >> than stink too, so I guess I'll get me a 3rd one for this machine. > >> > >> I also see the latest versions of the *542 and *860 drivers can now > >> do 51200 microsteps, which if combined with the correct currents > >> should be able to move steppers as close to silently as they can be > >> moved. > >> > >> Unforch, while I can probably get steps out of a 5i25 fast enough > >> to get decent speeds, the interfaces between them, and likely the > >> opto's in the DM542 and DM860 drivers, are not fast enough to take > >> full advantage of that. > >> > >> That is likely one of the things I will do today since I am still > >> waiting on the 5i25. Set up one motor, a 470oz, on the 36v supply > >> that came with the kit, and see if the DM542 is faster than the > >> 2M542. I doubt it unless the opto's are lasers. At 200 per rev, > >> *51200=10,240,000 steps per revolution. As that would be a 1000% > >> step forward in the "state of the art", I don't think so. > >> > >> In my tests with a 2M542 a couple of months back, using a duty > >> cycle tweakable function generator, I was able to spin a 425oz > >> motor close to 3000 revs in the /8 microstep mode, but ran out of > >> opto speeds in the 2M542 at about 2200 revs (not quite 340 > >> kilohertz at the function generator output when trying the /16 step > >> setting. Most any divisor fell over at 330 to 340 kilohertz with > >> the motor stalling silently. > >> > >> They seem to need a 2 u-sec step, and a 3 to 4 u-sec resting period > >> at best. In this case, they were on & never turned off as the OC > >> voiltage stayed within a few millivolts of ground. > >> > >> Slow opto's on this thing would explain my lack of results. > >> > >> One question though Steve, I had to put a power supply on it, I > >> thought the parport had a 5 volt pin but don't have a pinout handy > >> ATM. Do I have a bad parport? Or is my memory getting foggy? > >> > >>> Steve Stallings > >>> > >>>> -----Original Message----- > >>>> From: Gene Heskett [mailto:[email protected]] > >>>> Sent: Sunday, June 21, 2015 4:56 PM > >>>> To: [email protected] > >>>> Subject: [Emc-developers] Next prob, zero docs on the BOB > >>>> supplied > >>>> > >>>> Which is a db25-1205. Google found it ok, but its a 17 megabyte > >>>> .exe. > >>>> > >>>> Whats the usual linux program to open this winders stuff? > >>>> > >>>> Cheers, Gene Heskett > >>>> -- > >>>> "There are four boxes to be used in defense of liberty: > >>>> soap, ballot, jury, and ammo. Please use in that order." > >>>> -Ed Howdershelt (Author) > >>>> Genes Web page <http://geneslinuxbox.net:6309/gene> > >>>> > >>>> -------------------------------------------------------------- > >>>> ---------------- > >>>> _______________________________________________ > >>>> Emc-developers mailing list > >>>> [email protected] > >>>> https://lists.sourceforge.net/lists/listinfo/emc-developers > >>> > >>> ------------------------------------------------------------------ > >>>---- -------- Monitor 25 network devices or servers for free with > >>> OpManager! OpManager is web-based network management software that > >>> monitors network devices and physical & virtual servers, alerts > >>> via email & sms for fault. Monitor 25 devices for free with no > >>> restriction. Download now > >>> http://ad.doubleclick.net/ddm/clk/292181274;119417398;o > >>> _______________________________________________ > >>> Emc-developers mailing list > >>> [email protected] > >>> https://lists.sourceforge.net/lists/listinfo/emc-developers > >> > >> Cheers, Gene Heskett > >> -- > >> "There are four boxes to be used in defense of liberty: > >> soap, ballot, jury, and ammo. Please use in that order." > >> -Ed Howdershelt (Author) > >> Genes Web page <http://geneslinuxbox.net:6309/gene> > >> > >> ------------------------------------------------------------------- > >>----------- Monitor 25 network devices or servers for free with > >> OpManager! OpManager is web-based network management software that > >> monitors network devices and physical & virtual servers, alerts via > >> email & sms for fault. Monitor 25 devices for free with no > >> restriction. Download now > >> http://ad.doubleclick.net/ddm/clk/292181274;119417398;o > >> _______________________________________________ > >> Emc-developers mailing list > >> [email protected] > >> https://lists.sourceforge.net/lists/listinfo/emc-developers > > > > -------------------------------------------------------------------- > >---------- Monitor 25 network devices or servers for free with > > OpManager! OpManager is web-based network management software that > > monitors network devices and physical & virtual servers, alerts via > > email & sms for fault. Monitor 25 devices for free with no > > restriction. Download now > > http://ad.doubleclick.net/ddm/clk/292181274;119417398;o > > _______________________________________________ > > Emc-developers mailing list > > [email protected] > > https://lists.sourceforge.net/lists/listinfo/emc-developers > > ---------------------------------------------------------------------- >-------- Monitor 25 network devices or servers for free with OpManager! > OpManager is web-based network management software that monitors > network devices and physical & virtual servers, alerts via email & sms > for fault. Monitor 25 devices for free with no restriction. Download > now http://ad.doubleclick.net/ddm/clk/292181274;119417398;o > _______________________________________________ > Emc-developers mailing list > [email protected] > https://lists.sourceforge.net/lists/listinfo/emc-developers Cheers, Gene Heskett -- "There are four boxes to be used in defense of liberty: soap, ballot, jury, and ammo. Please use in that order." -Ed Howdershelt (Author) Genes Web page <http://geneslinuxbox.net:6309/gene> ------------------------------------------------------------------------------ Monitor 25 network devices or servers for free with OpManager! OpManager is web-based network management software that monitors network devices and physical & virtual servers, alerts via email & sms for fault. Monitor 25 devices for free with no restriction. Download now http://ad.doubleclick.net/ddm/clk/292181274;119417398;o _______________________________________________ Emc-developers mailing list [email protected] https://lists.sourceforge.net/lists/listinfo/emc-developers
