I think we bought a few of those breakout boards. They seem to work quite well.
https://www.youtube.com/watch?v=HPzow8L1dxw sam 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
