Re: [Emc-users] FW: Cardinal Engineering - MAZAKS for sale

2009-07-16 Thread Sven Wesley
Hmmm... It's a shame it costs a fortune to send stuff over here...


2009/7/16 Rainer Schmidt lemonn...@gmail.com

 Those are grim times... I helped dissolve a shop here in NJ and every
 single machine a tad larger than a machine of interest for a hobbyist
 went for the scrap metal price. Large machines only 5 years old were
 flying into the trash.
 A large precision lathe made in Germany... tight and flawless... went
 for $800.
 The low offerings might be what is normal right now...
 Best of luck!
 Rainer

 On Jul 15, 2009, at 5:56 PM, Sven Wesley wrote:

  2009/7/15 Steve Stallings steve...@newsguy.com
 
  To all on the emc-users list,
 
  Today I received an email from Roland. His auction is over and
  he did not sell the Mazaks. His is offering them EMC folks since
  one is already retrofitted with EMC. If you are interested, have
  a look at the message below.
 
  Cheers,
  Steve Stallings
 
 
  I haven't checked if it's posted on cnczone, but I would suggest to
  put an
  ad there.
 
  Regards,
  Sven
 
 --
  Enter the BlackBerry Developer Challenge
  This is your chance to win up to $100,000 in prizes! For a limited
  time,
  vendors submitting new applications to BlackBerry App World(TM) will
  have
  the opportunity to enter the BlackBerry Developer Challenge. See
  full prize
  details at: http://p.sf.net/sfu/Challenge
  ___
  Emc-users mailing list
  Emc-users@lists.sourceforge.net
  https://lists.sourceforge.net/lists/listinfo/emc-users



 --
 Enter the BlackBerry Developer Challenge
 This is your chance to win up to $100,000 in prizes! For a limited time,
 vendors submitting new applications to BlackBerry App World(TM) will have
 the opportunity to enter the BlackBerry Developer Challenge. See full prize
 details at: http://p.sf.net/sfu/Challenge
 ___
 Emc-users mailing list
 Emc-users@lists.sourceforge.net
 https://lists.sourceforge.net/lists/listinfo/emc-users

--
Enter the BlackBerry Developer Challenge  
This is your chance to win up to $100,000 in prizes! For a limited time, 
vendors submitting new applications to BlackBerry App World(TM) will have
the opportunity to enter the BlackBerry Developer Challenge. See full prize  
details at: http://p.sf.net/sfu/Challenge
___
Emc-users mailing list
Emc-users@lists.sourceforge.net
https://lists.sourceforge.net/lists/listinfo/emc-users


[Emc-users] newbies and 7i43 and join following error ..

2009-07-16 Thread Olivier R-D
Hi,

I have a 7i43(big) emc 2.3.2 and currently one dc motor with an encoder 
which I am using for testing...
My problem is that when starting enc and using the jogg function in the 
interface I get the famous join following error for Y and Z (something 
which is normal since they are not connected) but also for X so it seems 
I am missing something but I have no idea what .

the hostmod2 module loads fine.

I am using the example for 7i43(big) in emc and I havent changed 
anything yet.

I know my encoder works and I connected A, B and IDX
I connect PWM and DIR. PWM Enable is not connected, I suppose it is 
only needed for some special motor controllers.

after starting the interface I click the the emergency stop, then the 
machine power icon, then I choose manual control and I click on the + 
or - of the interface for the X axis

When I monitor the IO using a real oscilloscope I see ... nothing.. Even 
  the DIR io does not change depending if I click on the + or - of the 
emc interface, absolutely no PWM is emited from the board  so I do 
not get how emc can say that the join is not following when it does not 
even try to emit a PWM signal ...

Do I need to connect something else ? is emc expected another IO signal 
? any idea is welcome

Thanks

Regards,
Olivier


  emc
EMC2 - 2.3.2
Machine configuration directory is '/home/olivier/emc2/configs/hm2-servo-1'
Machine configuration file is '7i43-big.ini'
Starting EMC2...
libGL error: open DRM failed (Operation not permitted)
libGL error: reverting to (slow) indirect rendering
joint 0 following error
emc/task/taskintf.cc 607: Error on axis 0, command number 116


--
Enter the BlackBerry Developer Challenge  
This is your chance to win up to $100,000 in prizes! For a limited time, 
vendors submitting new applications to BlackBerry App World(TM) will have
the opportunity to enter the BlackBerry Developer Challenge. See full prize  
details at: http://p.sf.net/sfu/Challenge
___
Emc-users mailing list
Emc-users@lists.sourceforge.net
https://lists.sourceforge.net/lists/listinfo/emc-users


Re: [Emc-users] newbies and 7i43 and join following error ..

2009-07-16 Thread Andy Pugh
2009/7/16 Olivier R-D o@laposte.net:

  so I do
 not get how emc can say that the join is not following when it does not
 even try to emit a PWM signal ...

EMC might well be trying to emit a PWM signal, but it might not be
getting through the hardware abstraction layer, the onboard hardware
or the 7i43.

What do you see looking at the pwm pin in Halscope? If EMC is setting
values there but not seeing the motor move, then it will set a follow
error, because there _is_ a following error.

(Off-topic rant, I am often phoned by people in other sections of the
Major Auto Manufacturer I work for asking us to fix the software bug
that is causing an engine fault to be flagged. Nine times out of ten
it is a genuine fault with the engine being correctly diagnosed)

-- 
atp

--
Enter the BlackBerry Developer Challenge  
This is your chance to win up to $100,000 in prizes! For a limited time, 
vendors submitting new applications to BlackBerry App World(TM) will have
the opportunity to enter the BlackBerry Developer Challenge. See full prize  
details at: http://p.sf.net/sfu/Challenge
___
Emc-users mailing list
Emc-users@lists.sourceforge.net
https://lists.sourceforge.net/lists/listinfo/emc-users


Re: [Emc-users] newbies and 7i43 and join following error ..

2009-07-16 Thread Olivier R-D

 (Off-topic rant, I am often phoned by people in other sections of the
 Major Auto Manufacturer I work for asking us to fix the software bug
 that is causing an engine fault to be flagged. Nine times out of ten
 it is a genuine fault with the engine being correctly diagnosed)
 
In that case I am quite sure I make a fault somewhere :-) ...I just do 
not know where to look for it

so now I am trying to understand halscope ...


--
Enter the BlackBerry Developer Challenge  
This is your chance to win up to $100,000 in prizes! For a limited time, 
vendors submitting new applications to BlackBerry App World(TM) will have
the opportunity to enter the BlackBerry Developer Challenge. See full prize  
details at: http://p.sf.net/sfu/Challenge
___
Emc-users mailing list
Emc-users@lists.sourceforge.net
https://lists.sourceforge.net/lists/listinfo/emc-users


Re: [Emc-users] newbies and 7i43 and join following error ..

2009-07-16 Thread Olivier R-D

 What do you see looking at the pwm pin in Halscope? 
ok In halscope I see the PWM signal
But When I turn my motor for hand I also see encoder.00.position which 
goes up 1 for every signal from encoder then to 0 again ... so somehow 
that signal gets up to emc ..

What is supposed to happen if I turn the motor by hand ? should the 
visualization in AXIS update to show the new position ? If so I have a 
problem because it does not


--
Enter the BlackBerry Developer Challenge  
This is your chance to win up to $100,000 in prizes! For a limited time, 
vendors submitting new applications to BlackBerry App World(TM) will have
the opportunity to enter the BlackBerry Developer Challenge. See full prize  
details at: http://p.sf.net/sfu/Challenge
___
Emc-users mailing list
Emc-users@lists.sourceforge.net
https://lists.sourceforge.net/lists/listinfo/emc-users


Re: [Emc-users] newbies and 7i43 and join following error ..

2009-07-16 Thread Stephen Wille Padnos
Olivier R-D wrote:

What do you see looking at the pwm pin in Halscope? 


ok In halscope I see the PWM signal
  

How are you seeing the PWM signal?  Are you looking at the PWM output pin?
You mentioned before that you have disconnected PWM Enable - where do 
you mean that?  There are a few places where this can be done:  in HAL 
(disconnect the axis.0.amp-enable pin), between the 7i43 and the 7i33, 
or between the 7i33 and your motor drive.  (change as appropriate for 
your setup, if you're using one of the motor drive daughtercards instead 
of the 7i43)

But When I turn my motor for hand I also see encoder.00.position which 
goes up 1 for every signal from encoder then to 0 again ... so somehow 
that signal gets up to emc ..
  

So it toggles back and forth between 0 and 1 count?  If so, one phase 
of the encoder isn't connected correctly or isn't working.

What is supposed to happen if I turn the motor by hand ? should the 
visualization in AXIS update to show the new position ? If so I have a 
problem because it does not
  

You can do this even with EMC2 in the machine off state.  If you turn 
the motor by hand, you should see the position readout in AXIS change.  
If you keep turning in one direction, the value should continue to 
increase or decrease.

Hope this helps
- Steve


--
Enter the BlackBerry Developer Challenge  
This is your chance to win up to $100,000 in prizes! For a limited time, 
vendors submitting new applications to BlackBerry App World(TM) will have
the opportunity to enter the BlackBerry Developer Challenge. See full prize  
details at: http://p.sf.net/sfu/Challenge
___
Emc-users mailing list
Emc-users@lists.sourceforge.net
https://lists.sourceforge.net/lists/listinfo/emc-users


Re: [Emc-users] newbies and 7i43 and join following error ..

2009-07-16 Thread Andy Pugh
2009/7/16 Olivier R-D o@laposte.net:

 What is supposed to happen if I turn the motor by hand ? should the
 visualization in AXIS update to show the new position ? If so I have a
 problem because it does not

I am not sure if the Axis display is of commanded position or feedback
position, I rather suspect the first. In that case the online display
wouldn't change.

On the PWM signal, it seems that EMC is sending data to the software
pin, but you can't see it with an oscilloscope on the physical pin.
You didn't mention it in the original query, but I assume there is a
servo-amplifier of some sort in this system?

-- 
atp

--
Enter the BlackBerry Developer Challenge  
This is your chance to win up to $100,000 in prizes! For a limited time, 
vendors submitting new applications to BlackBerry App World(TM) will have
the opportunity to enter the BlackBerry Developer Challenge. See full prize  
details at: http://p.sf.net/sfu/Challenge
___
Emc-users mailing list
Emc-users@lists.sourceforge.net
https://lists.sourceforge.net/lists/listinfo/emc-users


Re: [Emc-users] newbies and 7i43 and join following error ..

2009-07-16 Thread Peter C. Wallace
On Thu, 16 Jul 2009, Olivier R-D wrote:

 Date: Thu, 16 Jul 2009 15:33:38 +0200
 From: Olivier R-D o@laposte.net
 Reply-To: Enhanced Machine Controller (EMC)
 emc-users@lists.sourceforge.net
 To: emc-users@lists.sourceforge.net
 Subject: Re: [Emc-users] newbies and 7i43 and join following error ..
 

 What do you see looking at the pwm pin in Halscope?
 ok In halscope I see the PWM signal
 But When I turn my motor for hand I also see encoder.00.position which
 goes up 1 for every signal from encoder then to 0 again ... so somehow
 that signal gets up to emc ..

As Stephen said this means that both encoder signals are not making it to the 
7I43, just one.

This may also explain the lack of PWM, depending on tuning, 1 count may not 
generate any PWM

What version of EMC are you using? some of the first versions that included 
HostMot2 (2.2.5 to 2.2.7 AFAICR) had example files that did not deal properly 
with the watchdog.

Inputs working but outputs all stuck high is a sure sign of 
a watchdog bite...


 What is supposed to happen if I turn the motor by hand ? should the
 visualization in AXIS update to show the new position ? If so I have a
 problem because it does not


 --
 Enter the BlackBerry Developer Challenge
 This is your chance to win up to $100,000 in prizes! For a limited time,
 vendors submitting new applications to BlackBerry App World(TM) will have
 the opportunity to enter the BlackBerry Developer Challenge. See full prize
 details at: http://p.sf.net/sfu/Challenge
 ___
 Emc-users mailing list
 Emc-users@lists.sourceforge.net
 https://lists.sourceforge.net/lists/listinfo/emc-users


Peter Wallace
Mesa Electronics

(\__/)
(='.'=) This is Bunny. Copy and paste bunny into your
()_() signature to help him gain world domination.


--
Enter the BlackBerry Developer Challenge  
This is your chance to win up to $100,000 in prizes! For a limited time, 
vendors submitting new applications to BlackBerry App World(TM) will have
the opportunity to enter the BlackBerry Developer Challenge. See full prize  
details at: http://p.sf.net/sfu/Challenge
___
Emc-users mailing list
Emc-users@lists.sourceforge.net
https://lists.sourceforge.net/lists/listinfo/emc-users


Re: [Emc-users] Using MDI or Jog during a program?

2009-07-16 Thread Tim Hedlund
Unfortunately, my tool path is complicated.   Usually it will have
several turns in the path.   It is almost like we teach the controller
way points to travel to and thru.

Thanks, Tim H.


On Wed, Jul 15, 2009 at 9:53 AM, Leslie Newellles.new...@fastmail.co.uk wrote:
 That script will only work on a tool change. I don't think there is a
 way of running a script from M0 or M1.

 Tim, is the weld line straight or a complicated shape? If I was doing it
 I think I would write a script to do all of it and bypass the g-code
 completely. Another alternative would be to write a script that grabs
 the current torch positions then generates a complete g-code program
 that you can then run.

 Les


 Hubert Bahr wrote:
 Tim
 This seems somewhat related to a recent request of mine. I had asked
 about being able to use MDI or manual modes during a tool change. Leslie
 provided me with a new hal_manualtoolchange which allowed me move etc.
 then hit continue and return to the program. In this case I would zero
 my z-axis or if necessary change other offsets as well. Then hit
 continue. I believe he did this in python. I can provide you a copy of
 it as an example of possibly Leslie will chime in.

 Hubert

 Tim Hedlund wrote:

 I sure could use some help jogging during a program.  My project
 involves laser beam welding, I would like to:

 1.  Rapid to start of weld
 2.  Use joystick  to align start of weld (camera attached to welding head)
 3.  Record start position to variable
 4.  Rapid to end of weld
 5.  Use joystick  to align end of weld
 6.  Then weld back to the starting point(variable)

 Everything is working just fine on my system but I can’t jog during a
 program to my target location, any ideas?

 Thanks in advance for your help!
 Tim H






 --
 Enter the BlackBerry Developer Challenge
 This is your chance to win up to $100,000 in prizes! For a limited time,
 vendors submitting new applications to BlackBerry App World(TM) will have
 the opportunity to enter the BlackBerry Developer Challenge. See full prize
 details at: http://p.sf.net/sfu/Challenge
 ___
 Emc-users mailing list
 Emc-users@lists.sourceforge.net
 https://lists.sourceforge.net/lists/listinfo/emc-users



 --
 Enter the BlackBerry Developer Challenge
 This is your chance to win up to $100,000 in prizes! For a limited time,
 vendors submitting new applications to BlackBerry App World(TM) will have
 the opportunity to enter the BlackBerry Developer Challenge. See full prize
 details at: http://p.sf.net/sfu/Challenge
 ___
 Emc-users mailing list
 Emc-users@lists.sourceforge.net
 https://lists.sourceforge.net/lists/listinfo/emc-users


--
Enter the BlackBerry Developer Challenge  
This is your chance to win up to $100,000 in prizes! For a limited time, 
vendors submitting new applications to BlackBerry App World(TM) will have
the opportunity to enter the BlackBerry Developer Challenge. See full prize  
details at: http://p.sf.net/sfu/Challenge
___
Emc-users mailing list
Emc-users@lists.sourceforge.net
https://lists.sourceforge.net/lists/listinfo/emc-users


[Emc-users] X axis Homing in wrong direction

2009-07-16 Thread Leav Oz-Ari
Hi Everyone!
First post here so I hope I don't mess this us up!

First I've got to say that I'm REALLY impressed with EMC2, it's much much
better and user friendly than any other CNC program I tried (Mach3 and
TurboCNC).

My problem is that I'm getting the X axis on my machine homing in the wrong
direction (Y and Z work fine).

The irection pins are set correctly, and the machine can move in both
directions... I have 0 set up as the home location, but when the machine
starts in some location (it reads out as 25 for example) it moves in the
opposite direction (and registers this way! it knows it is increasing the X
value) and away from the home axis...

Can I attach files to this list? I'd send you the stepconf file or
something..

Any help is greatly appreciated, and let me know if my explanation doesn't
explain the problem properly...

Thanks!
-Leav
--
Enter the BlackBerry Developer Challenge  
This is your chance to win up to $100,000 in prizes! For a limited time, 
vendors submitting new applications to BlackBerry App World(TM) will have
the opportunity to enter the BlackBerry Developer Challenge. See full prize  
details at: http://p.sf.net/sfu/Challenge
___
Emc-users mailing list
Emc-users@lists.sourceforge.net
https://lists.sourceforge.net/lists/listinfo/emc-users


Re: [Emc-users] X axis Homing in wrong direction

2009-07-16 Thread Luc Claeys
Hi Leav,

 Hi Everyone!
 First post here so I hope I don't mess this us up!
 
 First I've got to say that I'm REALLY impressed with EMC2, it's much much
 better and user friendly than any other CNC program I tried (Mach3 and
 TurboCNC).
 
 My problem is that I'm getting the X axis on my machine homing in the wrong
 direction (Y and Z work fine).

You can configure in what direction the homing sequence starts.
It is all explained here:
  http://linuxcnc.org/docs/2.2/html/config_ini_homing.html

If it is not clear, or if it is not working as explained in that page,
call again for details.

Luc


--
Enter the BlackBerry Developer Challenge  
This is your chance to win up to $100,000 in prizes! For a limited time, 
vendors submitting new applications to BlackBerry App World(TM) will have
the opportunity to enter the BlackBerry Developer Challenge. See full prize  
details at: http://p.sf.net/sfu/Challenge
___
Emc-users mailing list
Emc-users@lists.sourceforge.net
https://lists.sourceforge.net/lists/listinfo/emc-users


Re: [Emc-users] Using MDI or Jog during a program?

2009-07-16 Thread Leslie Newell
If you want to align your path to the start and end points you will have 
to both shift and rotate your coordinates.

How good are your programming skills? EMC is pretty easy to work with so 
it wouldn't be difficult to write an application that does exactly what 
you want.

Les



Tim Hedlund wrote:
 Unfortunately, my tool path is complicated.   Usually it will have
 several turns in the path.   It is almost like we teach the controller
 way points to travel to and thru.
 
 Thanks, Tim H.
 
 

--
Enter the BlackBerry Developer Challenge  
This is your chance to win up to $100,000 in prizes! For a limited time, 
vendors submitting new applications to BlackBerry App World(TM) will have
the opportunity to enter the BlackBerry Developer Challenge. See full prize  
details at: http://p.sf.net/sfu/Challenge
___
Emc-users mailing list
Emc-users@lists.sourceforge.net
https://lists.sourceforge.net/lists/listinfo/emc-users


Re: [Emc-users] Hostmot2 homing

2009-07-16 Thread Leslie Newell
Hi Peter,

I have been doing some more tests on this. Playing around with filters 
and screening had no noticeable effect. However I have hit an odd 
anomaly. Just out of interest I switched the 7I29 to single ended input 
and suddenly it is rock solid. So it can't be noise pickup in the 
cabling. Any ideas why differential inputs are causing a problem? I know 
both index and \index are connected correctly.

Another odd thing - in differential mode if I disconnect one line the 
input toggles randomly, obviously picking up noise. Again, shouldn't a 
balanced input give no output with one line disconnected?

By the way, is the 7i29 encoder circuitry the same as the 7i33?

Les



 
 The hardware works (just tested SV12 encoder 5). There may not be much 
 apparent difference between inverted or non-inverted index because they are 
 both edge triggered. It looks like the driver does not set the ABGateIndex 
 bit 
 so what I said about index happening all the time with the wrong index 
 polarity would not happen, just the home position might change by a count or 
 2 
 depending in index width (assuming a normal rotary encoder short index).
 
 If swapping the leads solves your problem, it might be electrical 
 troubles. The current driver not setting ABGateindex means a narrow index 
 pulse would work regardless of polarity though the home position would 
 change slightly depending on whether the rising or falling edge generates 
 the index event (since an edge is always needed)
 

--
Enter the BlackBerry Developer Challenge  
This is your chance to win up to $100,000 in prizes! For a limited time, 
vendors submitting new applications to BlackBerry App World(TM) will have
the opportunity to enter the BlackBerry Developer Challenge. See full prize  
details at: http://p.sf.net/sfu/Challenge
___
Emc-users mailing list
Emc-users@lists.sourceforge.net
https://lists.sourceforge.net/lists/listinfo/emc-users


Re: [Emc-users] Hostmot2 homing

2009-07-16 Thread Peter C. Wallace
On Thu, 16 Jul 2009, Leslie Newell wrote:

 Date: Thu, 16 Jul 2009 22:33:13 +0100
 From: Leslie Newell les.new...@fastmail.co.uk
 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] Hostmot2 homing
 
 Hi Peter,

 I have been doing some more tests on this. Playing around with filters
 and screening had no noticeable effect. However I have hit an odd
 anomaly. Just out of interest I switched the 7I29 to single ended input
 and suddenly it is rock solid. So it can't be noise pickup in the
 cabling. Any ideas why differential inputs are causing a problem? I know
 both index and \index are connected correctly.

One difference is that the TTL inputs have an RC filter, the differential 
inputs have none.

I wonder if your index outputs can drive the termination resistor. Have you 
measured you index and /index outputs for reasonable differential output 
voltage when terminated by the 7I29?


Also are you sure about the jumpering: differntal mode is selectec with jumper 
W1 or W4 moved so its closer to the encoder 10 pin header


 Another odd thing - in differential mode if I disconnect one line the
 input toggles randomly, obviously picking up noise. Again, shouldn't a
 balanced input give no output with one line disconnected?

Im not sure there are any guarantees of what will happen if one input is 
connected to a possibly noisy input line and the other is open. I would not 
expect any outputs signal as I would expect the termination resistor to make 
the open input follow the noise driven input.

 By the way, is the 7i29 encoder circuitry the same as the 7i33?

Yes, and we've pretty much had 0 trouble with it.


 Les




 The hardware works (just tested SV12 encoder 5). There may not be much
 apparent difference between inverted or non-inverted index because they are
 both edge triggered. It looks like the driver does not set the ABGateIndex 
 bit
 so what I said about index happening all the time with the wrong index
 polarity would not happen, just the home position might change by a count or 
 2
 depending in index width (assuming a normal rotary encoder short index).

 If swapping the leads solves your problem, it might be electrical
 troubles. The current driver not setting ABGateindex means a narrow index
 pulse would work regardless of polarity though the home position would
 change slightly depending on whether the rising or falling edge generates
 the index event (since an edge is always needed)


 --
 Enter the BlackBerry Developer Challenge
 This is your chance to win up to $100,000 in prizes! For a limited time,
 vendors submitting new applications to BlackBerry App World(TM) will have
 the opportunity to enter the BlackBerry Developer Challenge. See full prize
 details at: http://p.sf.net/sfu/Challenge
 ___
 Emc-users mailing list
 Emc-users@lists.sourceforge.net
 https://lists.sourceforge.net/lists/listinfo/emc-users


Peter Wallace
Mesa Electronics

(\__/)
(='.'=) This is Bunny. Copy and paste bunny into your
()_() signature to help him gain world domination.


--
Enter the BlackBerry Developer Challenge  
This is your chance to win up to $100,000 in prizes! For a limited time, 
vendors submitting new applications to BlackBerry App World(TM) will have
the opportunity to enter the BlackBerry Developer Challenge. See full prize  
details at: http://p.sf.net/sfu/Challenge
___
Emc-users mailing list
Emc-users@lists.sourceforge.net
https://lists.sourceforge.net/lists/listinfo/emc-users


Re: [Emc-users] Hostmot2 homing

2009-07-16 Thread Jon Elson
Leslie Newell wrote:

 Another odd thing - in differential mode if I disconnect one line the 
 input toggles randomly, obviously picking up noise. Again, shouldn't a 
 balanced input give no output with one line disconnected?

   
No.  Unless either a bias is added to the inputs, or the comparator has 
significant hysteresis, when the comparator has the same voltage on both 
inputs, it can't make a decision.
So, you get noise - ie, it is bouncing between yes and no.

Jon

--
Enter the BlackBerry Developer Challenge  
This is your chance to win up to $100,000 in prizes! For a limited time, 
vendors submitting new applications to BlackBerry App World(TM) will have
the opportunity to enter the BlackBerry Developer Challenge. See full prize  
details at: http://p.sf.net/sfu/Challenge
___
Emc-users mailing list
Emc-users@lists.sourceforge.net
https://lists.sourceforge.net/lists/listinfo/emc-users


Re: [Emc-users] Hostmot2 homing

2009-07-16 Thread Jon Elson
Peter C. Wallace wrote:
 One difference is that the TTL inputs have an RC filter, the differential 
 inputs have none.

 I wonder if your index outputs can drive the termination resistor. Have you 
 measured you index and /index outputs for reasonable differential output 
 voltage when terminated by the 7I29?
   
Very good point!  Some of these open collector encoders with puny 1 K 
(or even higher) pull-up resistors will not give a whole lot of signal 
with a 100 Ohm termination.
It wouldn't take a lot of electrical noise to reduce that noise margin 
to zero.

Jon

--
Enter the BlackBerry Developer Challenge  
This is your chance to win up to $100,000 in prizes! For a limited time, 
vendors submitting new applications to BlackBerry App World(TM) will have
the opportunity to enter the BlackBerry Developer Challenge. See full prize  
details at: http://p.sf.net/sfu/Challenge
___
Emc-users mailing list
Emc-users@lists.sourceforge.net
https://lists.sourceforge.net/lists/listinfo/emc-users