On Mon, 18 Apr 2022, gene heskett wrote:
Date: Mon, 18 Apr 2022 16:37:48 -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: Re: [Emc-users] nother Q for Peter
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
The pins are:
hm2_5i25.0.7i76.0.0.analogin0
hm2_5i25.0.7i76.0.0.analogin1
hm2_5i25.0.7i76.0.0.analogin2
hm2_5i25.0.7i76.0.0.analogin3
You need to set the 7I76 in a mode that enables the analog inputs
(modes 1 or 2)
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Peter Wallace
Mesa Electronics
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