On Wednesday 19 August 2020 14:04:54 Thaddeus Waldner wrote: > Can someone define a good way to test the keypad scan signals? I put a > scope on a circuit and it appears that the signals stands out clearly > from the noise. I don’t know what the switch thresholds are so the > noise could still be enough to cause issues. Setting the scope trigger > voltage to about 1/3 of the scan voltage causes it to trigger on > noise. > > Should I be doing anything to condition the keypad lines? Pullup > resistors are internal, so I connected them directly to the 7i73. > > Could unused pins be an issue?
Only if a lot of wire is attached. But I'd suspect ground loops from a lack of single point grounding is the real problem. > > On Aug 7, 2020, at 1:34 PM, Gene Heskett <ghesk...@shentel.net> > > wrote: > > > > On Friday 07 August 2020 14:07:04 Thaddeus Waldner wrote: > >> I finally got to do a little troubleshooting and here’s what I > >> found: > >> > >> Key response on the keypad is never as fast as the on-screen UI but > >> it is consistent. I’m guessing there’s about a 100-300 ms delay but > >> that’s just a guess. Could this delay be due to the fact that this > >> is a scanning keypad? What is the scan rate on > >> > >> Once the inverter starts, I get a LOT of noise on the SmartSerial > >> lines. The noise voltage is around 4v as measured from the 7i73 > >> ground but it spikes to higher than that. Frequency is about 40khz > >> but it’s not consistent. > > > > Check the invertor for a ground that does not go directly to that > > single bolt or buss bar I preach about. If its connected to that > > bolt, lift it and see if its still grounded someplace else, and > > isolate it from that unwanted ground. Then hook it back up to the > > common bolt. The static ground line to the invertors PSU should go > > only to this bolt. The static ground in the power cord should go to > > this bolt. But only once if there are more than one power cord. > > > > In rare cases, the moving parts of the machine, such as the table > > and Z sled or knee should be jumpered to the machine frame, and that > > frame connected to this common bolt. Well oiled moving ways are not > > that great an ohmic connection if actively moving on a film of oil. > > > >> The noise on the 5v power supply line to the 7i73 is minimal. The > >> 7i73 and all its connected switches are grounded only through the > >> board’s connection to the 7i96 board. > >> > >> Would a shielded ethernet cable help? > > > > You could try it, but I'd have doubts. Shielding only grounded at > > one end. Both make a ground loop you don't need or want. > > > > > > IHTH. > > > >>> On Jul 31, 2020, at 9:17 AM, andy pugh <bodge...@gmail.com> wrote: > >>> > >>> On Fri, 31 Jul 2020 at 15:15, Peter C. Wallace <p...@mesanet.com> > > > > wrote: > >>>> Also even with default sserial error management you could only > >>>> have 10 servo thread cycles (10 ms with a 1 ms servo thread) of > >>>> delay due to failed transactions before a sserial error popup > >>>> would occur. > >>> > >>> Maybe noise on the keyboard itself? Is the keycode pin a single > >>> clean transition? > >>> > >>> -- > >>> 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, 1912 > >>> > >>> > >>> _______________________________________________ > >>> Emc-users mailing list > >>> Emc-users@lists.sourceforge.net > >>> https://lists.sourceforge.net/lists/listinfo/emc-users > >> > >> _______________________________________________ > >> Emc-users mailing list > >> Emc-users@lists.sourceforge.net > >> <mailto:Emc-users@lists.sourceforge.net> > >> https://lists.sourceforge.net/lists/listinfo/emc-users > >> <https://lists.sourceforge.net/lists/listinfo/emc-users> > > > > 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) > > If we desire respect for the law, we must first make the law > > respectable. - Louis D. Brandeis > > Genes Web page <http://geneslinuxbox.net:6309/gene > > <http://geneslinuxbox.net:6309/gene>> > > > > > > _______________________________________________ > > Emc-users mailing list > > Emc-users@lists.sourceforge.net > > <mailto:Emc-users@lists.sourceforge.net> > > https://lists.sourceforge.net/lists/listinfo/emc-users > > <https://lists.sourceforge.net/lists/listinfo/emc-users> > > _______________________________________________ > Emc-users mailing list > Emc-users@lists.sourceforge.net > https://lists.sourceforge.net/lists/listinfo/emc-users 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) If we desire respect for the law, we must first make the law respectable. - Louis D. Brandeis Genes Web page <http://geneslinuxbox.net:6309/gene> _______________________________________________ Emc-users mailing list Emc-users@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/emc-users
