On Wed, 19 Aug 2020, Thaddeus Waldner wrote:
Date: Wed, 19 Aug 2020 13:04:54 -0500
From: Thaddeus Waldner <thadw...@gmail.com>
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] 7i73 Lagging jog key
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?
No additional components should be needed
Are the keycodes actually delayed?
The keypad scanning/debouncing adds about 30 ms delay to make and break
but nothing like 100/300 ms
If keycodes are delayed, it does suggest a noise issue in the keypad signals
but its not really clear if this is the case
Can you try with just the 7I73 a single switch
and no additions connections to eliminate ground bumping noise issues
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
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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>>
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Mesa Electronics
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