On Monday, 18 April 2022 13:49:36 EDT gene heskett wrote: > On Monday, 18 April 2022 10:38:10 EDT Peter C. Wallace wrote: > > On Mon, 18 Apr 2022, gene heskett wrote: > > > Date: Mon, 18 Apr 2022 04:19:27 -0400 > > > From: gene heskett <ghesk...@shentel.net> > > > Reply-To: "Enhanced Machine Controller (EMC)" > > > > > > <emc-users@lists.sourceforge.net> > > > > > > To: "Enhanced Machine Controller (EMC)" > > > <emc-users@lists.sourceforge.net> Subject: [Emc-users] nother Q for > > > Peter > > > > > > Greetings; > > > > > > How does the A/D on a 7i76D handle overvoltage? I'm considering a > > > long > > > tailed vfet pair with a 22k pullup to 42 volts. Does it just goto > > > full > > > scale at an $FF output, or will that blow something? > > > > Full scale (inputs will take up to 100V indefinitely) > > but adjacent inputs may read incorrectly if more than about > > 50V is suppled (due to current injection into parasitic > > transistors related to the input ESD diodes of the CPU) > > Excellent news Peter, I'm off to the races then.
But the starting gate won't open. I've re-read 7i76man.pdf several times w/o the method of actually getting the digital value from one of the 4 ports it works for. I have something tied to port-0, but I think that may be a leftover from before I used the hy-485 module to drive the spindle, so it looks like I should figure on using port-1. How does reading an A/D derived digital value from port-1 get done in the hal file? Thank you. 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, 1940) If we desire respect for the law, we must first make the law respectable. - Louis D. Brandeis _______________________________________________ Emc-users mailing list Emc-users@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/emc-users
