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? > 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
