On Nov 13, 2012, at 2:08 PM, Viesturs Lācis wrote:
> I somehow had skipped the fact that encoders on servos have
> differential signal output, but 7i39 cards expect single-ended signal.
> Since that is plasma machine with all the noise from plasma, I do not
> think that using only half of the dif
On Wed, 14 Nov 2012, Erik Christiansen wrote:
Date: Wed, 14 Nov 2012 22:03:45 +1100
From: Erik Christiansen
Reply-To: emc-users@lists.sourceforge.net
To: emc-users@lists.sourceforge.net
Subject: Re: [Emc-users] Differential signal from encoders
On 13.11.12 22:37, Jon Elson wrote:
Viesturs L
On 13.11.12 22:37, Jon Elson wrote:
> Viesturs Lācis wrote:
> > I was thinking that I could try making a 422-to-ttl converter, based
> > on the scheme in top-left corner of this sheet:
> > http://www.kmitl.ac.th/~kswichit/Rs422/Rs422.pdf
> >
> That drawing uses some very old parts, and may no lo
Viesturs Lācis wrote:
> Hello!
>
> I somehow had skipped the fact that encoders on servos have
> differential signal output, but 7i39 cards expect single-ended signal.
> Since that is plasma machine with all the noise from plasma, I do not
> think that using only half of the differential signal is
gt; From: Gene Heskett
>> Reply-To: "Enhanced Machine Controller (EMC)"
>>
>> To: emc-users@lists.sourceforge.net
>> Subject: Re: [Emc-users] Differential signal from encoders
>>
>> On Tuesday 13 November 2012 19:17:17 Viesturs L??cis did opine:
>
t; > To: emc-users@lists.sourceforge.net
> > Subject: Re: [Emc-users] Differential signal from encoders
> >
> > On Tuesday 13 November 2012 19:17:17 Viesturs Lےےcis did opine:
> >
> > 2012/11/14 Gene Heskett :
> > > That is a good start. In view of the noise,
On Tue, 13 Nov 2012, Gene Heskett wrote:
Date: Tue, 13 Nov 2012 19:42:59 -0500
From: Gene Heskett
Reply-To: "Enhanced Machine Controller (EMC)"
To: emc-users@lists.sourceforge.net
Subject: Re: [Emc-users] Differential signal from encoders
On Tuesday 13 November 2012 19:17:17
On 13 November 2012 23:09, Viesturs Lācis wrote:
> Where can I find out, how does the raw-write facility work?
http://www.linuxcnc.org/docs/html/man/man9/hostmot2.9.html
"Raw Mode"
If you set "debug modules" then the encoder filter register addresses
will be printed to dmesg.
(or look around fo
On Tuesday 13 November 2012 19:17:17 Viesturs Lācis did opine:
> 2012/11/14 Gene Heskett :
> > That is a good start. In view of the noise, I think I would add a quad
> > of 1n914 type diodes, such that the noise can't rise too far above
> > the 5volt line, or go too far below ground. Two with the
2012/11/14 Gene Heskett :
>
> That is a good start. In view of the noise, I think I would add a quad of
> 1n914 type diodes, such that the noise can't rise too far above the 5volt
> line, or go too far below ground. Two with the cathode bands toward 5v,
> the anodes to A & B, and two more from a &
Thank You, Andy and Charles!
2012/11/14 Peter C. Wallace :
>
> if these are indeed 1000 CPR (250 line) thats correct, but if they are 1000
> line encoders (4000 counts per rev) max count frequency would be 200 KHz
>
I do not get this one. The way I understand this is: each line on
encoder is one
On Tuesday 13 November 2012 17:38:24 Viesturs Lācis did opine:
> Hello!
>
> I somehow had skipped the fact that encoders on servos have
> differential signal output, but 7i39 cards expect single-ended signal.
> Since that is plasma machine with all the noise from plasma, I do not
> think that usi
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On 11/13/2012 4:28 PM, Viesturs Lācis wrote:
> 2012/11/14 Peter C. Wallace :
>>
>> You can do the whole encoder interface with a 26LS32A chip (4
>> channel RS-422 receiver)
>
> Thank You, I did not know that such a chip exists with several
> channels
On Wed, 14 Nov 2012, Viesturs L?cis wrote:
> Date: Wed, 14 Nov 2012 00:28:13 +0200
> From: "[UTF-8] Viesturs L?cis"
> Reply-To: "Enhanced Machine Controller (EMC)"
>
> To: "Enhanced Machine Controller (EMC)"
> Subject: Re: [Emc-users] Differe
On 13 November 2012 22:28, Viesturs Lācis wrote:
>> (so you can set the encoder digital filter to reject HF
>> noise)
>
> Could You, please, explain, what does TTL signal has to do with high
> or low count rate?
With a high filter constant you can get away with some encoder noise,
but can't coun
2012/11/14 Peter C. Wallace :
>
> You can do the whole encoder interface with a 26LS32A chip (4 channel RS-422
> receiver)
Thank You, I did not know that such a chip exists with several channels in one.
I just checked - even our local electronics supply store have them in
stock (at least that is w
On Tue, 13 Nov 2012, Viesturs L?cis wrote:
> Date: Tue, 13 Nov 2012 23:08:36 +0200
> From: "[UTF-8] Viesturs L?cis"
> Reply-To: "Enhanced Machine Controller (EMC)"
>
> To: "Enhanced Machine Controller (EMC)"
> Subject: [Emc-users] Differentia
Hello!
I somehow had skipped the fact that encoders on servos have
differential signal output, but 7i39 cards expect single-ended signal.
Since that is plasma machine with all the noise from plasma, I do not
think that using only half of the differential signal is a good idea.
I was thinking that
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