Re: [Emc-users] 7i76 input with NPN NO

[James Reed]

Evidently, I'm not accustomed to the usual NPN proxes.  We have some NPN 
devices at work that have the collector tied to supply, with the emitter as the 
output.

From: Peter C. Wallace 
Sent: Wednesday, September 2, 2020 7:22 PM
To: Enhanced Machine Controller (EMC) 
Subject: Re: [Emc-users] 7i76 input with NPN NO

On Wed, 2 Sep 2020, James Reed wrote:

> Date: Wed, 2 Sep 2020 22:50:25 +
> From: James Reed 
> Reply-To: "Enhanced Machine Controller (EMC)"
> 
> To: "Enhanced Machine Controller (EMC)" 
> Subject: Re: [Emc-users] 7i76 input with NPN NO
>
> What am I missing here?  I see a NPN output transistor as the source to a
> sinking input.  The sinking input has a 20K input impedance according to
> specs.  I would think if anything, the input may need a 2 to 10K resistor to
> ground so the NPN can switch reliably.  This is totally dependent on the
> minimum current of the sensor output.  From:


NPN sensors are effectively a switch to ground so will not work
with sinking inputs (the input voltage will be 0 in both states)
unless there is a pullup resistor to create a high level when the
switch is off. That said the issue is a bit confused as some NPN
sensors have built in pullups to their positive power supply.

Ideally a PNP sensor should be used with sinking inputs and a
NPN sensor used with sourcing inputs.

Peter Wallace
Mesa Electronics




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Re: [Emc-users] 7i76 input with NPN NO

[James Reed]

What am I missing here?  I see a NPN output transistor as the source to a 
sinking input.  The sinking input has a 20K input impedance according to specs. 
 I would think if anything, the input may need a 2 to 10K resistor to ground so 
the NPN can switch reliably.  This is totally dependent on the minimum current 
of the sensor output.

From: Gene Heskett 
Sent: Wednesday, September 2, 2020 3:53 PM
To: emc-users@lists.sourceforge.net 
Subject: Re: [Emc-users] 7i76 input with NPN NO

On Wednesday 02 September 2020 14:07:40 Marius wrote:

> I am using a 7i76e which has sinking inputs. The machine was built
> using NPN N/O proximity sensors. Am I correct in saying that I have to
> pull the sensor output up with a resistor and then connect that
> junction to the 7i76 input?
>
I belive so Marius.  Pull that pin up with about a 5k to 5 volts, and
short it to ground to activate.
>
> Regards
>
> Marius
>
>
>
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Re: [Emc-users] Bridgeport servo troubleshooting

[James Reed]

Your testing technique is good. I don't know the particular servos that you 
have, but on my BP, the servos have a tach feedback. Since the runaway 
condition happened on 2 different motors but the same drive, either the input 
from the tach feedback may be bad, or you've got a output device (transistor?) 
shorted.  The output is more likely the case, since the output bridge could 
have shorted during power up, causing the fuse/breaker to blow.


From: Ben Potter 
Sent: Saturday, March 4, 2017 4:33:27 PM
To: emc-users@lists.sourceforge.net
Subject: [Emc-users] Bridgeport servo troubleshooting

Good afternoon,



I've got a converted Bridgeport Interact which decided to give up the ghost
last week. I think that one of the servo drives/amps is dead, and am hoping
that someone can sanity check my troubleshooting before I start spending
money.

Before I removed any wires, I checked the wire numbers against the schematic
and put everything back in the same place.



Fault:

On power on, blows fuse/breaker.



Diagnostic:

1: Remove power + HV bus from X, Y, Z drives

Powered up, no axis movement possible

2: Connected power + HV bus from X drive

Powered up, X movement OK

3: Connected power + HV bus from Y drive

Powered up, X + Y movement OK

4: Connected power + HV bus from Z drive

Blew fuse

5: Removed X drive, put Z drive in place of X

On power up X motor ran at maximum speed until I hit e-stop

6: Put Z drive back in place, replaced X drive. Disconnected motor
connection only from Z drive

On power up X and Y movement OK.

7: Reconnected Z motor to Z drive

On power up Z ran at maximum speed until I hit e-stop



I'm pretty sure that the Z drive is dead - can anyone suggest any other
tests I should do?



Thanks
Ben

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Re: [Emc-users] VFD recommendations - braking resistor vs mechanical brake.

[James Reed]

The spindle brake is usually something that holds the spindle after stopping.  
I believe my Bridgeport has a ratchet which engages a gear.  Obviously, I don't 
want to try to use that to bring the spindle to a stop.

The reason you need a braking resistor is to dissipate the back emf from the 
motor after a rapid decel.  If you don't perform too rapid of a decel, then the 
braking resistor is not required.  I would imagine, from all I have seen, that 
rigid taping would usually require a braking resistor, even if the decel was 
caused by drag on the spindle.  I typically pick a VFD one size larger than 
what is required to help mitigate the need for a braking resistor.  If the load 
is high inertia, or a heavy load, I will go 2 steps up in size and then still 
use the braking resistor.



From: Jim Craig 
Sent: Thursday, February 2, 2017 3:29 PM
To: Enhanced Machine Controller (EMC)
Subject: Re: [Emc-users] VFD recommendations - braking resistor vs mechanical 
brake.

On 2/2/2017 9:13 AM, John Thornton wrote:
> I also have an Automation Direct GS2 on my BP knee mill and rigid tap
> with it (need the braking resistor).
>
> JT
John,

That is an interesting point. I am getting ready to add gear tooth
sensors on the bull gear so I can rigid tap. I don't have a braking
resistor on my drive. Currently the mechanical spindle brake engages
when the spindle stops via a pneumatic cylinder. To be honest I am not
sure if it would engage during a spindle reversal as I don't do that
currently. It probably would not. Does the rigid tapping cycle stop the
spindle or does it do a reversal without stopping? M3 M5 M4 M5 or M3 M4 M5?

I figured that the drag from tapping would stop the spindle pretty
quickly without the resistor. I would like to hear more about your
experience with this situation.

Thanks,

Jim


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Re: [Emc-users] encoder wiring question

[James Reed]

I wouldn't run encoder wiring in the same conduit as power wiring.  Most 
encoder wiring is at a 0 to 5 volt level, and could easily pick up noise from 
the power or tach wiring which could mean extra or mixed counts.  I would also 
have the tach wiring and encoder wiring run with shielded cable, with the 
shields tied solidly to chassis ground.

 Date: Sun, 13 Nov 2011 14:06:53 -0800
 From: bmkl...@yahoo.com
 To: emc-users@lists.sourceforge.net
 Subject: [Emc-users] encoder wiring question
 
 I am adding 5000 count Heidenhain rotary encoders to the servo motors on my 
 mill. 
 The conduit that goes from the servo motor to the control box that holds the 
 power and tach wiring, can I run the encoder wiring in that conduit.
 Would the power or tach wiring interfere with the encoder in anyway?
 
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Re: [Emc-users] Using a PC in extended temperature ranges and mobile application

[James Reed]

You can do the same thing electricians do in an explosion-proof enclosure.  The 
idea of an explosion proof enclosure is not to prevent the vapors from entering 
the enclosure, but to contain any explosion that could occur inside the 
enclosure. ( Kind of re-assuring, isn't it?)  When these enclosures have 
threaded openings, they have 2 to 4 times as many threads as the non-explosion 
proof openings, and they have larger or square openings with large flanges and 
usually gaskets.  In order to meet code, the conduit which leads to these 
enclosures have to have a conduit seal with putty or epoxy in them to prevent 
the flow or explosion from/to other places.  It's actually more complicated 
than this, but this is the kind of detail that you will want to know.  

You don't have to go explosion proof, but can copy their techniques.

I would be leery of putting batteries in a totally enclosed box, though.

 Date: Sat, 16 Jul 2011 18:58:48 -0400
 From: e...@dc9.tzo.com
 To: emc-users@lists.sourceforge.net
 Subject: [Emc-users] Using a PC in extended temperature ranges and mobile 
 application
 
 
 Hi Guys..
 
 I am considering using EMC2 (or part of it) in a mobile application that 
 defines the term rugged.
 
 The application itself is pretty simple so I am not worried about the 
 software.  I am worried about the survival of the hardware.
 
 The equipment will be mounted in a box on a piece of drilling 
 equipment.   Power will be supplied via a diesel engine driving an 
 alternator into a set of batteries.
 
 The drilling equipment is rotary - no impact - so the vibration should 
 be reasonable if I shock mount the control panel.  However the machine 
 will only be used once in a while.
 
 This machine will live outside year around.When it is not being 
 used, the machine will be un-powered so I have no way of putting a panel 
 heater in the box to keep out condensation.  I'm thinking about using
 some type of desiccant system?? to keep the humidity down in the panels 
 to avoid a condensation problem.
 
 I'm really not concerned about the higher range of temperatures since 
 there will be a roof over the control panel so I should be able to keep 
 the sun off it.  I am mostly concerned about the low end of the 
 temperature range.   They could be
 using this drilling machine in temps as low as 20 degrees F or so.
 They will expect to be able to start up the engine, run it for 5 minutes 
 or so and then flip on the controls and have them function properly.  
 This might be after the machine has been
 sitting for a few months outside in places like the Rocky Mountains in 
 Colorado
 
 I'd like to use as many off the shelf devices as possible - PC boards 
 etc... if possible.
 
 Being a typical customer, they want to keep the costs down but they also 
 want it to work and operate reliably.
 
 I've had good luck using conventional industrial controls on machines 
 that operate outside, but I have always been able to include a panel 
 heater to minimize condensation issues.
 
 Do you guys have any suggestions?
 
 Dave
 
 
 
 
 
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Re: [Emc-users] 7i43 or 5i20

[James Reed]

Yes, the data sheet talks of SoftDMC, and that is the control remoted on the 
7i43 FPGA.  I am using Hostmot2 instead of SoftDMC.  Even then, if my memory 
serves me, the PID values entered in the FPGA appear to be the only ones that 
matter.  I'd have to revisit that to be sure.

 Date: Sat, 23 Oct 2010 23:59:31 +0100
 From: a...@andypugh.fsnet.co.uk
 To: emc-users@lists.sourceforge.net
 Subject: Re: [Emc-users] 7i43 or 5i20
 
 On 23 October 2010 23:29, James Reed jsr...@hotmail.com wrote:
 
  Yes, but you can have the 7i43 or 5i20 perform the PID calculations.
 
 Are you sure?
 
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Re: [Emc-users] 7i43 or 5i20

[James Reed]

Yes, but you can have the 7i43 or 5i20 perform the PID calculations.  This 
offloads the control update rates to the FPGA, and lessens the burden on the 
parallel or PCI port.  I am in the process of using a 7i43 for a Bridgeport 
BTC-1 retrofit, and haven't had any problems with update rates.

 From: andyi_w...@btinternet.com
 To: emc-users@lists.sourceforge.net
 Date: Sat, 23 Oct 2010 22:42:33 +0100
 Subject: Re: [Emc-users] 7i43 or 5i20
 
 Ok, so if I have this right:
 Servo thread periods of 1000us - 2000us are fine for 3/4 axis mill cutting 
 steel / aluminium with rapids of say 120ipm.  Benefit of hardware stepgens 
 is improved resolution of accelerating / decelerating pulse trains - makes 
 better use of stepper motors are high rpm.
 
 7i43 on a parallel port should cope with 1 to 2kHz servo thread BUT there is 
 an issue with setting the EPP parallel port mode on the D510MO when running 
 Ubuntu 10.04.
 
 The other option is 5i20 or 5i23 PCI cards which don't have the EPP issue 
 but are x2 more expensive than the 7i43.
 
 Life is never easy :(
 Regards
 Andy
 
 --
 From: Jon Elson el...@pico-systems.com
 Sent: Saturday, October 23, 2010 7:14 PM
 To: Enhanced Machine Controller (EMC) emc-users@lists.sourceforge.net
 Subject: Re: [Emc-users] 7i43 or 5i20
 
  Andy Pugh wrote:
  Possibly. I have read somewhere that a sane (200uS) servo-thread
  _execution_ period is only enough time to shift 50 bytes through a
  parallel port. That is potentially limiting, but has not been a
  problem I have noticed with my 4-axis machine. The software stepgens
  running in the base thread and twiddling pins individually are
  effectively shifting one word per thread cycle.
 
  At first I was going to take major exception to your numbers, but if
  your servo loop has
  to read position, compute PID, etc. and then write velocity out to the
  device,
  actually, you may be just about right!  Using a PCI parallel port in EPP
  mode,
  200 us should allow up to 250 bytes or so to be transferred, but that
  would take up
  the entire SERVO_PERIOD.  You have to leave some slack for timing 
  variation,
  and also for computation.  So, the 50-byte figure might be quite close.
 
  For my USC board, for instance, there are 4 axes, with 3 bytes of
  position and
  3 bytes of velocity for each.  Plus a little digital I/O.  So, it reads
  14 bytes and write
  13, plus setup and control overhead.  Total of about 35 I/O operations
  per servo
  cycle.  You could easily run a 10 KHz servo cycle with 4 axes, or 5 KHz
  with 8
  axes on a modern CPU and PCI parport.
 
  Jon
 
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Re: [Emc-users] Mesa 7i43 parallel port hookup

[James Reed]

I knew I was going to do quite a lot of ribbon cable work, so I bought a 50 
conductor ribbon cable and the necessary ribbon cable connectors (ribbon to 
DB25 and header) to do the job.  The 50 conductor was all I could find 
available, so I just stripped off what upper conductors I didn't need.  
The cables like you show were much too short for me.  I made mine around 3 foot 
long.

 Date: Sat, 13 Feb 2010 12:27:52 +
 From: a...@andypugh.fsnet.co.uk
 To: emc-users@lists.sourceforge.net
 Subject: Re: [Emc-users] Mesa 7i43 parallel port hookup
 
 On 13 February 2010 05:42, Flying Electron sa...@flyingelectron.com wrote:
 
  http://www.pccables.com/cgi-bin/orders6.cgi?action=Showitempartno=07123rsite=f.07123
  http://www.pccables.com/cgi-bin/orders6.cgi?action=Showitempartno=07123rsite=f.07123
 
 The 7i43 manual seems to indicate that that will work.
 
 EPP INTERFACE CONNECTOR
 On the 7I43 (but not the 7I43H), P2 is the EPP printer port interface
 connector. P2
 is a 26 pin header. P2 pin-out matches stands DB25 printer port
 pin-out, allowing a simple
 flat cable with a DB25M IDC connector on one end and a 26 pin female
 header on the
 other end to interface the hosts printer port to the 7I43.
 
  What are other people using to hook up the EPP port?
 
 I soldered the ribbon cable wires to the D-sub connector individually,
 but only because that was the only type of header I had.
 
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Re: [Emc-users] Pendant MPG

[James Reed]

Yes, you could do as you said.  Then you would need to tie +5VDC to pins 16, 
13, and 4, and ground to pin 8.  BUT, there is a more efficient way.  If you 
use only 2 of the gates, it would be better to use gates A and C (or B and D).  
If you were to use gate A and C, you could tie +5 VDC to pins 16 and 4.  This 
would prevent B and D from trying to drive their outputs, and eliminates some 
possible noise and power problems in the chip.

The differential output is a way to double noise margins and increase speed 
while still using 5 volt logic.  In the case of a MPG, it makes the signal on 
the cable from the MPG to the I/O more stable and noise free.  But it takes 
another pin for each signal, and you can change it to a single ended (ie 1 
wire) signal just before it goes to the 5i20 or 7i37, and save  2 I/O pins.

 Date: Thu, 26 Nov 2009 16:20:08 -0700
 From: a...@conceptmachinery.com
 To: emc-users@lists.sourceforge.net
 Subject: [Emc-users] Pendant MPG
 
 Hi.
 I want to add pendant to my system that has– 2 -5i20 and 4 -7i37 boards.
 From WIKI I can see page - http://www.anderswallin.net/2006/11/jogging-emc2/
 I am interesting in
  “To save I/O pins, I first decode the differential signals to
 single-ended ones using a DS3486.”
 How many I/O pins I can save with use of DS3486?
 I have 2  boards 5i20 and 4- 7 i37, so I may use extra I/O pins I need to
 use instead DS3486?
 
 I case if I want to use DS3486, how to wire it up?
 http://www.national.com/mpf/DS/DS3486.html#Overview
 
 On diagram http://cache.national.com/ds/DS/DS3486.pdf  I can see
 INPUTS A; 1 and 2, and output A.
 
 INPUTS B; 1 and 2, and OUTPUT B
 INPUTS C; 1 and 2, and OUTPUT C
 INPUTS D; 1 and 2, and OUTPUT D
 
 My MPG has A+ A- B+ B-., How are they related?
 Is this right:
 A+ and A- (from MPG) to two pins { INPUTS A (on DS3486)
 and use OUTPUT A
 B+ and B- (from MPG) to two pins { INPUTS B  (on DS3486)
 And use OUTPUT B
 And INPUTS C and INPUTS D left alone.
 
 Should I use DS3486 with some special adapter etc?
 
 Thanks
 Aram
 
 
 
 
 
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Re: [Emc-users] emc chess pawn part program

[James Reed]

Research the emc archives.  I believe SWPadnos had me load tofrodos on my 
none-net machine a few months ago.  Goslowjimbo.

 Date: Mon, 31 Aug 2009 10:19:04 -0400
 From: spad...@sover.net
 To: emc-users@lists.sourceforge.net
 Subject: Re: [Emc-users] emc chess pawn part program
 
 Mark Wendt (Contractor) wrote:
 
 [snip]
 
 Gene,
 
  I agree on the networking.  I was just tossing the dos2unix 
 utility up as a quick and dirty way to confirm that it was a Winders 
 vs *nix file formatting issue.
   
 
 It's unlikely that this is the problem.  I believe that EMC2-2.2.3 now 
 handles DOS line endings gracefully now, and that earlier versions would 
 give an error message.  Additionally, dos2unix is part of the tofrodos 
 package, which would have to be installed ... from the net :)
 
 Rondal, can we get more information about the computer?  So far, I think 
 the only specs you've provided are an older computer.
 
 - Steve
 
 
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Re: [Emc-users] OpenGL on EMC2? + 7i43

[James Reed]

Well said, Jack.  Onward!

 Date: Tue, 7 Jul 2009 10:18:36 -0500
 From: j...@coats.org
 To: emc-users@lists.sourceforge.net
 Subject: Re: [Emc-users] OpenGL on EMC2? + 7i43
 
 I think we have gotten the message across to Richard.
 
 Folks that NEED a place to call for everything, and with
 less patience, and more money than time, NEED to have
 a vendor they can pay to fix things.
 
 Much of the economy in the USA (and I assume to some
 extent elsewhere) is based on this perceived need.
 
 There is nothing wrong with Richards requests, other than
 a perceived feeling that there is an obligation to 'make it right
 on his terms'.
 
 If Richard or others need that, there are folks that are willing
 to sell EMC2 and other FOSS products to him with a service
 contract so they will be their first line of defense.
 
 I am guessing we have some of those vendors on this
 list.
 
 Nothing wrong with that either.  I used to work for a company
 that sold FOSS systems and support.  They were basically
 a white box vendor, that added their service, and charged the
 customer for the privilege of the customer not having to do it
 themselves.  One problem we did have was our customers
 figured out the software was FOSS, so they went to the lists
 to get support.  Again, nothing wrong there.  But then they
 expected us to 'fix' what they had done for 'free' because it
 was FOSS. ... At time it is hard to say no to customers,
 but without $$ we had to.
 
 ... Enough war stories, lets go back to fixing issues and
 let us know of your successes!
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Re: [Emc-users] OpenGL on EMC2? + 7i43

[James Reed]

I'm sorry you didn't have time to read my letter but had time to reply.  I only 
read the first line of yours.

 Date: Sun, 5 Jul 2009 03:48:27 -0300
 From: eyela...@gmail.com
 To: emc-users@lists.sourceforge.net
 Subject: Re: [Emc-users] OpenGL on EMC2? + 7i43
 
 James, i'm now tired and is bed time, i couldn't read all your message, 
 but i want to say just a little thing after reading some few lines.
 

Communication is shutting down now.  You aren't listening so others won't talk 
or listen to you.

Sincerely, 

Jim Reed 
(aka Goslowjimbo)

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Re: [Emc-users] Weird EMC2 tuning issue (direction reverses intermittently)

[James Reed]

I've read several of the other replies.  They all seem to have good advice, but 
what I would tend to look at first is the grounding of your signals.  It could 
be that your direction signal could be misinterpreted by the driver board 
because your reference point (ground) isn't as quiet as it needs to be to get a 
100% consistent signal.

Sometimes the solution is just a larger ground wire, sometimes some signals 
need to be isolated from ground to receive the signal consistently.  Do you 
have access to an oscilloscope?  If so, ground the scope to your computer and 
read the ground line on your driver board.  If the voltage at the driver should 
be only tenths of a volt.  If it is greater than that, some changing is in 
order.

I also divide and conquer when I can - halscope is a good window into the EMC 
actions, and the scope is the tool for outside the computer.

 From: jpe...@peasej.com
 To: emc-users@lists.sourceforge.net
 Date: Sun, 5 Jul 2009 12:25:16 -0700
 Subject: [Emc-users] Weird EMC2 tuning issue (direction reverses  
 intermittently)
 
 I am working on tuning my homebuilt HobbyCNC machine with EMC 2.3. I  
 am using the HobbyCNC EZ driver board to interface with my PC. I have  
 things working, but am working on tweaking the ini settings to get as  
 high of feedrate as I can reliably.
 
 One mysterious issue I've seen that I'm trying to figure out is that  
 very, very rarely, a movement command to the milling machine will make  
 an axis move the correct distance in the INCORRECT direction. This can  
 happen either when running a gcode program or manually jogging the  
 axis in a direction. If it occurs during a jog, usually all I have to  
 do to fix it is stop jogging and then start again.
 
 The computer interfaces with the driver board using the normal STEP,  
 DIRECTION signals for each axis over the parallel port.
 
 The question is, where do you think this issue is being introduced? It  
 seems unlikely that EMC2 could be getting the direction wrong in  
 isolated cases, but, to me, it seems equally unlikely that the driver  
 board is driving a particular direction incorrectly in isolated cases.  
 This might also be a symptom of operating at too high of a feedrate  
 (in the current case I have been trying to make 40 inches per second  
 work), but I'm hoping to hear from someone who has seen and fixed this  
 issue before I try dropping the feedrate. Like I say, this issue crops  
 maybe .05% of the time - very rare, but enough to affect the overall  
 reliability of my machine.
 
 Any ideas?
 
 
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Re: [Emc-users] OpenGL on EMC2? + 7i43

[James Reed]

Richard:
 No one is here with the intent to make you mad, deceive you, or coerce you 
into developing something.   As near as I can determine, everyone has tried to 
be patient and caring.  The trouble is, these dedicated people are trying to 
advance the EMC project, provide support, and document everything on their own 
time, donating every bit of it.  That's how open source happens most of the 
time.  

I'm not trying to deny you have frustrations, just trying to let you know you 
are chasing away the very people you need to succeed.  

I, too, when I first started trying to learn here got very frustrated.  As I 
continued on, I even quit for a while.  Then I realized it was not those people 
(who had already tried to help me tremendously - as they have you)  that I was 
frustrated with, but my own progress.  
To solve that, I printed out each of the manuals, read them front to back at 
least 3 times, and practiced on little projects until I could remember at least 
a few of the tricks and commands. (I'm a slow learner as everyone on the EMC 
project probably knows).

I still forget things and where they are located, and occasionally get reminded 
of that on the mailing list or chat lines.  

As far as your concern of running a 7i43 right out of the box, I can't and 
haven't found that claim anywhere.  I'm not saying you're wrong, I just never 
saw it.  Actually, some good has come out of your ranting in the way of Ted 
Hyde's description which helped many of us anticipating the use of the Mesa 
boards, but I wouldn't expect any more progress, as you're beating up on your 
helpers.

Please step back, see if you really want to pursue EMC and work with the 
developers and helpers, and then proceed accordingly.

PS:  I noticed you wanted the people of EMC to step back and take time to 
understand your problem.  That is exactly what the EMC people are trying to say 
to you.  Take the time to study your problem, reasearch all you can, and study 
the documents to understand what is going on.  Then, if you politely show you 
have done your homework, they will be much more willing to pursue your problem.


 Date: Fri, 3 Jul 2009 23:26:38 -0300
 From: eyela...@gmail.com
 To: emc-users@lists.sourceforge.net
 Subject: Re: [Emc-users] OpenGL on EMC2? + 7i43
 
 Maybe if you try to pay more attention and take some time to understand 
 what you read and realize noone asked for YOUR PREFERENCE (Quoted).
 You could find (if you read) that i have explained about the way i 
 installed the system and than i did it the same way you did.
 also i explained than it was working in the past but now not anymore, 
 so, there is no concern about anyone's preferences but a certain need of 
 support and that is why i asked for help trying to solve a rare issue.
 
 
 I'm suscribed to this list for about a year and never found a 
 real(complete) answer for any issue.
 I'am also a suscriber to several other lists, and always found someone 
 who solved, helped me to solve or at least pushed me on the right path, 
 but that's not the case here. (always bumping except for Ted Hyde who 
 made the config and etc... that made the brick to finally start showing 
 numbers)
 
 The support on LinuxCNC is clearly the biggest weakness.
 
 Since my first inquiry i found exactly that... or at least that was the 
 case with my mesa board. some people may remember the past year's 
 adventures trying to make my 7i43 to at least say i'm alive
 
 I had to pay a linuxer to solve the strange phyton_opengl issue, wich 
 took him less than 5 minutes, so it shouldn't be something that bad. I 
 wonder how many time he needed to figure the solution on his mind.
 
 And, off course, about the EVERYTHING_can_WORK_on_this_BOARD (7i43) 
 and the fact that had no answer about the way to connect the motors thru 
 a freq. variator i had to pay another person, and off course, there 
 IS a WAY, and it can work correctly.
 so, again:
 
 The support on LinuxCNC is clearly the biggest weakness.
 
 Now... i ask myself...
 
 Why didn't i paid for a working solution based on windows from the
 begining?
 It could made me save almost a year of work in a project that is
 lost. Yes... i lost the project because my customer got tired to
 wait for something that WAS SUPPOSSED TO BE WORKING OUT OF THE BOX.
 
 Why did i believe
 
1. There was real support on the Linux world.
2. There was a simple and cheap do it yourself solution bassed on
   Linux   and
3. All that seemed to be so easy, was really easy.
 
 
 I know there is a lot of people with functional machines, nicely done 
 retrofittings, etc... but...
 Was all that applied to the industry, was all that applied to a real 
 productive environment? o was as it seems applied to hobbyst 
 environments where everything can work partially?
 
 
 Sincerelly people...
 
 The support on LinuxCNC is clearly the biggest weakness.
 
 
 Thanks to everyone who tryed to help, thanks to everyone 

Re: [Emc-users] Help about comp

[James Reed]

You need to install emc2-dev and build-essential.  Just use the synaptic 
package manager to install them.  
http://www.linuxcnc.org/irc/irc.freenode.net:6667/emc/2009-06-23.txt has a 
conversation about loading the packages on a computer without net access.  Look 
at about 5:51.  

If you can search with the right keywords, just about every question on EMC is 
answered at linuxcnc.org.

 Date: Wed, 24 Jun 2009 16:42:22 -0300
 From: pablo.e.p...@gmail.com
 To: emc-users@lists.sourceforge.net
 Subject: [Emc-users] Help about comp
 
 Hello,
 I have installed the Live CD based on Ubuntu 8.04 with emc. When y try to
 compile a .comp file bash do not find de comp comand.
 Whear can y find help with this.
 Thanks.
 Pablo.
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Re: [Emc-users] EMC2 typed versus scripted commands

[James Reed]

Well, it sounds like I will be pulling the computer back up to the house to get 
the newer revision.  I was just saying it was disabled because of the commented 
out lines.  Thanks for the help from both of you.  (And the fellows on IRC)

BTW, I checked in on IRC several times last night, and my computer said I was 
the only one on.  Is this true, or did I have another problem?

 Date: Tue, 14 Apr 2009 19:34:22 -0700
 From: p...@mesanet.com
 To: emc-users@lists.sourceforge.net
 Subject: Re: [Emc-users] EMC2 typed versus scripted commands
 
 On Tue, 14 Apr 2009, Sebastian Kuzminsky wrote:
 
  Date: Tue, 14 Apr 2009 20:16:20 -0600
  From: Sebastian Kuzminsky s...@highlab.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] EMC2 typed versus scripted commands
  
  Peter C. Wallace wrote:
  On Wed, 15 Apr 2009, James Reed wrote:
 
  I just checked.  Watchdog is disabled (commented out)
 
  The part that sets the watchdog timeout?
 
  Thats what needs to be commented out to disable the watchdog
 
  This is unfortunately not true.  There is currently no way to disable
  the watchdog via the hostmot2 driver, so it's always on and biting
  people who dont pet it.  Sorry!
 
 I was just going on my understanding of the hardware, if the timeout register 
 is not written, it will never bite (I guess the driver writes it with 
 something even if no timeout init is done)
 
 
 
  Compounding this problem, in the sample hostmot2 config distributed with
  2.2.8 the watchdog stuff is commented out, which means it always bites
  right away.  I dont understand how this ever works for you.  Maybe i'm
  missing something here.
 
  The easiest fix might be to upgrade to 2.3.0 beta2, which has a hostmot2
  7i43 config that doesnt bite people.
 
  If you want to stay with 2.2.8, uncomment (remove the # at the
  beginning) the line of m7i43_th.hal that says this:
 
  #addf hm2_7i43.0.pet_watchdog  servo-thread #enable if fw supported
 
 
  -- 
  Sebastian Kuzminsky
  We need numbers, not adjectives.  -- David MacKay
http://www.withouthotair.com/
 
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 Mesa Electronics
 
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Re: [Emc-users] EMC2 typed versus scripted commands

[James Reed]

How big is 2.3.0 Beta 2?  Can I load it on a USB stick and transfer it to the 
computer in the shop (miles away)?

 From: jsr...@hotmail.com
 To: emc-users@lists.sourceforge.net
 Date: Wed, 15 Apr 2009 09:24:57 +
 Subject: Re: [Emc-users] EMC2 typed versus scripted commands
 
 
 Well, it sounds like I will be pulling the computer back up to the house to 
 get the newer revision.  I was just saying it was disabled because of the 
 commented out lines.  Thanks for the help from both of you.  (And the fellows 
 on IRC)
 
 BTW, I checked in on IRC several times last night, and my computer said I was 
 the only one on.  Is this true, or did I have another problem?
 
  Date: Tue, 14 Apr 2009 19:34:22 -0700
  From: p...@mesanet.com
  To: emc-users@lists.sourceforge.net
  Subject: Re: [Emc-users] EMC2 typed versus scripted commands
  
  On Tue, 14 Apr 2009, Sebastian Kuzminsky wrote:
  
   Date: Tue, 14 Apr 2009 20:16:20 -0600
   From: Sebastian Kuzminsky s...@highlab.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] EMC2 typed versus scripted commands
   
   Peter C. Wallace wrote:
   On Wed, 15 Apr 2009, James Reed wrote:
  
   I just checked.  Watchdog is disabled (commented out)
  
   The part that sets the watchdog timeout?
  
   Thats what needs to be commented out to disable the watchdog
  
   This is unfortunately not true.  There is currently no way to disable
   the watchdog via the hostmot2 driver, so it's always on and biting
   people who dont pet it.  Sorry!
  
  I was just going on my understanding of the hardware, if the timeout 
  register 
  is not written, it will never bite (I guess the driver writes it with 
  something even if no timeout init is done)
  
  
  
   Compounding this problem, in the sample hostmot2 config distributed with
   2.2.8 the watchdog stuff is commented out, which means it always bites
   right away.  I dont understand how this ever works for you.  Maybe i'm
   missing something here.
  
   The easiest fix might be to upgrade to 2.3.0 beta2, which has a hostmot2
   7i43 config that doesnt bite people.
  
   If you want to stay with 2.2.8, uncomment (remove the # at the
   beginning) the line of m7i43_th.hal that says this:
  
   #addf hm2_7i43.0.pet_watchdog  servo-thread #enable if fw supported
  
  
   -- 
   Sebastian Kuzminsky
   We need numbers, not adjectives.  -- David MacKay
 http://www.withouthotair.com/
  
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  Peter Wallace
  Mesa Electronics
  
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[Emc-users] EMC2 typed versus scripted commands

[James Reed]

I am trying to use a Mesa Electronics' m7i43 FPGA card, one of their 4 servo 
accessory cards, and their input/output card.  I had previously wired this 
combination up to my BTC-1 mill to drive the servos and the Estop logic.  I 
used Ted Hyde's article on bringing up the 7i43 as a starting place.  

For me, in such an endeavor, I realize I have a lot to learn, so I started out 
just try to pull the Estop relay to ground.  I found the correct set of 
functions to do this (setp hm2_7i43.0.gpio.P3.041.is_output 1 , setp 
hm2_7i43.0.gpio.P3.041.is_inverted 1, setp hm2_7i43.0.gpio.P3.041.out 1).  Then 
I confidently added them as 3 lines of code to the .hal file.  I then stopped 
the EMC code (using the upper right hand X) and restarted it by clickong on 
the icon on my desktop.  I was really suprised when the I/O didn't work.  I 
tried re-tying the commands in as I had before, and that didn't work, either.  
Then I tried every combination of instruction I could, and only occasionally 
could get the relay to be pulled to ground.

The 3 instructions and a change in the number of PWMs coming put of the FPGA 
are the only changes I made to Ted's files.

Well, I seem to remember now that some components of EMC remain when you kill 
the program as I had.  So I shut the computer completely down, started it back 
up, and tried the new hal script.  The changes in the script didn't seem to do 
anything.  I could type in the changes, and then they would work.  Fearing I 
was trying to ask EMC to do something it was not ready to do, I added a call to 
a separate file at the bottom the the ini file, and loaded the commands in the 
new file.  After totaly rebooting, the changes still did not work.  Does anyone 
have any suggestions?

I am running 2.2.8, hostmot2 V 0.15, and 7i43 v0.2.

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Re: [Emc-users] EMC2 typed versus scripted commands

[James Reed]

I just checked.  Watchdog is disabled (commented out)

 Date: Tue, 14 Apr 2009 16:40:50 -0700
 From: p...@mesanet.com
 To: emc-users@lists.sourceforge.net
 Subject: Re: [Emc-users] EMC2 typed versus scripted commands
 
 On Tue, 14 Apr 2009, James Reed wrote:
 
  Date: Tue, 14 Apr 2009 23:13:24 +
  From: James Reed jsr...@hotmail.com
  Reply-To: Enhanced Machine Controller (EMC)
  emc-users@lists.sourceforge.net
  To: EMC USERS LIST LIST emc-users@lists.sourceforge.net
  Subject: [Emc-users] EMC2 typed versus scripted commands
  
 
  I am trying to use a Mesa Electronics' m7i43 FPGA card, one of their 4 
  servo 
  accessory cards, and their input/output card.  I had previously wired this 
  combination up to my BTC-1 mill to drive the servos and the Estop logic.  I 
  used Ted Hyde's article on bringing up the 7i43 as a starting place.
snip 
   The changes in the script didn't 
  seem to do anything.  I could type in the changes, and then they would 
  work. 
  Fearing I was trying to ask EMC to do something it was not ready to do, I 
  added a call to a separate file at the bottom the the ini file, and loaded 
  the commands in the new file.  After totaly rebooting, the changes still 
  did 
  not work.  Does anyone have any suggestions?
 
  I am running 2.2.8, hostmot2 V 0.15, and 7i43 v0.2.
 
 
 My guess is that the watchdog is biting you...
 
 If you are going to manipulate I/O by hand, you will need to disable (or 
 never enable) the watchdog
 
 
 
 Peter Wallace
 Mesa Electronics
 
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Re: [Emc-users] Off topic-Electrical design help

[James Reed]

Back when computers where not the norm, the company I worked with made a road 
load function generator. It worked in conjunction with a motor and a gearbox to 
couple a eddy current brake.  The brake had the road load function generator as 
its input.  The generator really was just a Y=aV^2+bV+c equation, which could 
easily be implemented in the computer today.  (V is speed, a,b  c are the 
coefficients of windage, resistance, and friction, respectively.)  I believe 
the uphill or downhill component would be mostly the b value.

 Date: Sat, 20 Dec 2008 12:11:43 +0100
 From: svenne.d...@gmail.com
 To: emc-users@lists.sourceforge.net
 Subject: [Emc-users] Off topic-Electrical design help
 
 Sorry guys for using the list for something not really related to EMC, but I
 do know here are a lot of people with the knowledge I need.
 
 It was long time ago I designed something with electronics, so I hope
 someone can help me.
 What I need is an electric braker-pusher. It will not need to come to an
 absolute stop, it should just add or release resistance on a rolling device.
 It's very much like the electric braker on a bicycle trainer, but with the
 option to give energy too.
 
 A little spec would be:
 A small motor, maybe 12 V and 30 W. Not sure how much needed yet.
 Should take a value, for example -100 to +100 from a computer, controlling
 the output. Minus values for braking and positive for pushing.
 Returns RPM from a magnet switch.
 
 The motor will always be rotated, even when braking at maximum, some kind of
 heat sink is definitely needed.
 I would say that the circuit is something like a servo controller board but
 a lot more primitive, no positioning or extras, just burning or giving
 energy.
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Re: [Emc-users] sherline configurations

[James Reed]

Mny times, the person asking the question is doing so because he is lost as to 
what could be the problem.   Without someone to tell him what is important, how 
does he know what to say?

Often the first cry for help is expected to be a opener so you can tell him 
what is important and what is not.


 Date: Thu, 24 Apr 2008 11:46:58 -0400
 From: [EMAIL PROTECTED]
 To: emc-users@lists.sourceforge.net
 Subject: Re: [Emc-users] sherline configurations
 
 Gene Heskett wrote:
 
 A bit rough on an obvious newbie, John.  In this case, and reading between 
 the 
 lines, I'm guessing that the terminology and format of the questions 
 stepconf 
 is asking are in effect, swahili to the OP, they are quite concise because 
 of 
 the gui's limits. When I ran it the first time, there were several items I 
 didn't get right as the wording was somewhat ambiguous.
 
 I'll admit I was a bit rough, and I apologize.  But...
 
 He will in time learn, if we are willing to help, but first we need to know 
 which question the OP is attempting to derive the answer to.
 
 EXACTLY!
 
 He didn't say I've done steps 1, 2, and 3, but I'm stuck on step 4. 
 He said give me the numbers.  And when John Thornton asked him Which 
 number, he said all of them.
 
 I am more than willing to try to help.  But the person asking for help 
 has to put in some effort too.
 
 Regards,
 
 John Kasunich
 
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Re: [Emc-users] Nisley Presentation at Cabin Fever

[James Reed]

OK, I wasn't there, so I don't know the full story.  Why the kid's finger in 
disrepair?

 From: [EMAIL PROTECTED]
 To: emc-users@lists.sourceforge.net
 Date: Mon, 28 Jan 2008 08:33:01 -0800
 Subject: [Emc-users] Nisley Presentation at Cabin Fever
 
 Nisley: I have posted your introduction pdf to my site under cnc resources 
 and it can stay there as long as you wish. I posted both the large and low 
 res versions.
 
 http://www.colinmackenzie.net/cnc/

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Re: [Emc-users] sagcad user ?

[James Reed]

 Date: Fri, 19 Oct 2007 06:56:14 -0700 From: 
[EMAIL PROTECTED] To: emc-users@lists.sourceforge.net Subject: [Emc-users] 
sagcad user ? hello Does anyone use sagcad and how is it? Will I need to 
install GCC compiler to install in Ubuntu 6.06 live install? I have acad r14 
but no cam. looking for something to run in linux for EMC2 knee mill 3 axis 
Thanks Al 


Do you have r14 on Ubuntu?  I've been trying to find out how to do that.
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Re: [Emc-users] DRO with pyvcp (was: Re: Qt3 lib and dro)

[James Reed]

I tried this.  The 2 minutes turned into about 16 hours, but I tried it.  I 
still have a lot to learn.


The trouble with using this is it creates 3 tiny numbers in a tiny box.  And 
it only reads to a tenth of an inch.  I have learned a lot (I think) from 
this, but it has some major drawbacks.




From: Anders Wallin [EMAIL PROTECTED]
Reply-To: Enhanced Machine Controller (EMC) 
emc-users@lists.sourceforge.net

To: Enhanced Machine Controller (EMC) emc-users@lists.sourceforge.net
Subject: [Emc-users] DRO with pyvcp (was: Re:  Qt3 lib and dro)
Date: Thu, 04 Jan 2007 12:59:51 +0200
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James Reed wrote:
 I try to be an open minded person.  SInce I don't understand pyVCP yet, 
and
 I know a little about Qt3, I thought trying both would be a good 
learning
 experience.  I haven't heard much about what the 2 minutes with pyVCP 
would

 entail, either.  I think I have soemwhat of a grasp on HAL, but that is
 because of the good documentation EMC has provided.

start by hooking up your encoders to HAL. Verify that everything is
working by starting three halmeters and watching the signal from each
encoder as you turn the axes. This is basically what you want, right?

With pyVCP you can create a standalone display that displays the values
of these hal pins, you don't need to manually start the halmeters and
select the correct signals.

The xml file would look something like this:
pyvcp
  number
 halpinaxis1_dro/halpin
  /number
  number
 halpinaxis2_dro/halpin
  /number
  number
 halpinaxis3_dro/halpin
  /number
/pyvcp

with a recent HEAD checkout, try putting the above in a file myfile.xml
and running 'pyvcp myfile.xml'
That should create the display, and three halpins: pyvcp.axis1_dro,
pyvcp.axis2_dro, pyvcp.axis3_dro
verify that the hal pins exist with halcmd show, or halmeter

then you need to hookup your encoder counts to the newly created pins,
so something like this:
bin/halcmd linkpp encoder1.out pyvcp.axis1_dro
bin/halcmd linkpp encoder2.out pyvcp.axis2_dro
bin/halcmd linkpp encoder3.out pyvcp.axis3_dro

There are ways to automate all of this, so you can start the fully
working dro from a shell file/desktop icon, but start by getting it to
work 'manually'.

hope this helps,

AW

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Re: [Emc-users] Qt3 lib and dro

[James Reed]

I tried this (pyvcp.hal  pyvcp.xml) , but it kept giving me the error 
waiting for component 'pyvcp' to become ready.  I don't believe it's in the 
.xml file because I substituted a very simple file and it still wouldn't get 
past the pyvcp command.  It did, however generate the display.




From: Dave Engvall [EMAIL PROTECTED]


On Jan 4, 2007, at 10:21 AM, [EMAIL PROTECTED] wrote:

 James Reed [EMAIL PROTECTED] wrote:

 I try to be an open minded person. SInce I don't understand pyVCP
 yet, and
 I know a little about Qt3, I thought trying both would be a good
 learning
 experience. I haven't heard much about what the 2 minutes with
 pyVCP would
 entail, either. I think I have soemwhat of a grasp on HAL, but
 that is
 because of the good documentation EMC has provided.

 Both approaches have their own strong points.  As Jeff
 demonstrated, the
 Qt code can easily make a nice DRO style display when EMC is running.
 http://axis.unpy.net/01167918097

 But it does require EMC to be running - it uses NML to get its
 data, and
 the NML data comes from EMC.  That in turn means that a number of EMC
 specific requirements need to be met.  For example, if you are
 trying to
 make a DRO for a manual machine, EMC will trip on a following error as
 soon as you turn the crank.

Naw!! Lie to the machine ... set following errors very high. Not nice
but workable.

Software designed to be a DRO is lots cleaner. Too bad the Mauch/
Kaluga boards have disappeared.

Dave

 If you want a plain DRO for a manual machine, you'll either need to do
 some programming to make the Qt stuff work without EMC, or you can use
 the HAL+PyVCP approach.

 The simplest HAL+PyVCP approach is simply to route the position
 from the
 encoders to PyVCP number widgets for display.  However, that
 gives you
 the raw position.  Wherever the axis was when you powered up will
 be zero,
 and you can't change that.

 A nicer DRO has a zero button (either one for each axis, or one that
 controls all three axes).  When you push it, the display is zeroed and
 all subsequent measurements are made from that point.  That is
 quite easy
 to do in HAL.  Use a sample/hold block to capture the present
 position,
 and subtract the captured position from the live position for display.
 HAL doesn't have a sample/hold block (yet), but the mux2 block works
 as a sample/hold if you feed its output back to one of its inputs.

 I've attached a pair of files, pyvcp-dro.xml and pyvcp-dro.hal, which
 (should) implement a 3 axis DRO with one zero button for each axis.
 I say should because I'm away from my Linux box and can't test it.

 To use, you need CVS HEAD (that's the only version with PyVCP at the
 moment).  Put the attached files in the top level directory of the
 checkout, open a shell, and run:

 scripts/halrun -I pyvcp-dro.hal

 To quit, type exit at the halcmd prompt.

 Regards,

 John Kasunich






 pyvcp-dro.hal
 pyvcp-dro.xml
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Re: [Emc-users] Qt3 lib and dro

[James Reed]

I try to be an open minded person.  SInce I don't understand pyVCP yet, and 
I know a little about Qt3, I thought trying both would be a good learning 
experience.  I haven't heard much about what the 2 minutes with pyVCP would 
entail, either.  I think I have soemwhat of a grasp on HAL, but that is 
because of the good documentation EMC has provided.


From: Anders Wallin [EMAIL PROTECTED]
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] Qt3 lib and dro
Date: Thu, 04 Jan 2007 09:53:31 +0200
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James Reed wrote:
  I downloaded the tarball.  Thanks for your permission.  Now, what do I 
do
  with it?  I'm very new at EMC, Linux, and even Qt3, (I'm more familiar 
with
  Qt3 than the others, though).

what do you want to do with it ? :)

if you are new to emc, and you don't insist on QT3, then a simple DRO
display is about 2 min of work with HAL and pyVCP (which uses Tkinter
widgets).

AW

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Re: [Emc-users] Qt3 lib and dro

[James Reed]

I downloaded the tarball.  Thanks for your permission.  Now, what do I do 
with it?  I'm very new at EMC, Linux, and even Qt3, (I'm more familiar with 
Qt3 than the others, though).


From: paul_c [EMAIL PROTECTED]
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emc-users@lists.sourceforge.net
To: emc-users@lists.sourceforge.net emc-users@lists.sourceforge.net
Subject: Re: [Emc-users] Qt3 lib and dro
Date: Wed, 3 Jan 2007 17:42:25 +
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Hi Ray

On Wednesday 03 January 2007 16:50, Ray Henry wrote:
  There is a way around it if we find that Paul successfully raises the
  proprietary flag with the work that I encouraged him to do with qt3.

You misjudge me - The point I was trying to get across was that the code in
question has NOT been released, and I would expect to be consulted (as a
courtesy) before anyone made the code public.

On Wednesday 03 January 2007 17:23, Ray Henry wrote:
  The version of Paul's qt3 stuff that I have here shows the appended GPL
  licensing.

Indeed, GPL Ver. 2 from the start. Attached is a tarball of the code in
question, along with a few other sources. You may add these to the fork of
your emc2 repository with one proviso - Copyright notice and license 
remains
unaltered, and any changes are clearly marked.


Regards, Paul.





 QtHMI.tar.bz2 


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[Emc-users] parallel port initializing

[James Reed]

I am attempting to run HAL without the use of EMC2.  As I have stated 
before, I want a DRO only at this point in time, and am not interested in 
the extras EMC offers.


I have successfully run HAL as an internal (to the computer) program (using 
the function generator in the HAL tutorial and a couple of comparators 
instead of the parport quadrature input).  HOWEVER, when I try real hardware 
and the parport, I neet 40mA at 5 volts to drive a pin high.  This usually 
indicates the port it configured for output still.


My question is this? When in the program does parport get initialized to 
inputs, and how do I make sure it is initialized before I try to drive it?


Thanks for your help.

_
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Re: [Emc-users] parallel port initializing

[James Reed]

I got Hal running as just the input for encoders.  It needed the write to 
the port.  The command 'loadrt hal_parport cfg=0x378_in' seems to be 
legal.  I've been running 1 encoder through it for a few hours.  Now I need 
to talk about how to link it to something like QT3.

You guys are great!  Thanks for the help.


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Subject: Re: [Emc-users] parallel port initializing
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James Reed [EMAIL PROTECTED] wrote:

  I am attempting to run HAL without the use of EMC2. As I have stated
  before, I want a DRO only at this point in time, and am not interested 
in
  the extras EMC offers.
 
  I have successfully run HAL as an internal (to the computer) program 
(using
  the function generator in the HAL tutorial and a couple of comparators
  instead of the parport quadrature input). HOWEVER, when I try real 
hardware
  and the parport, I neet 40mA at 5 volts to drive a pin high. This 
usually
  indicates the port it configured for output still.

Which pin?  Sorry if I'm repeating stuff you already know, but I'm just
making sure.  Pins 2-9 can be configured as inputs or outputs.  Pins 10,
11, 12, 13, and 15 are always inputs.  And pins 1, 14, 16, and 17 are
(almost) always ouputs.

To use pins 2-9 as inputs, you need to specify i or in in the config
string when you load the driver.

To use pins 1, 14, 16, and 17 as inputs, you first need a parport that
supports it, not all do.  Then you need to specify x in the config
string.  And finally, you need to set the corresponding outputs high.
The ports that support input on those pins do so by using open-collector
drivers that can pull down but not up.  If you set them high, there is
an internal pullup resistor that pulls the pin high, but it can be
overcome by an external source to read a low input.  You should not
attempt to force these pins high if they are being driven low.
Using pins 1, 14, 16, and 17 as inputs should be considered experimental.
I don't think it is supported at all in version 2.0.x, so unless you are
running code from CVS, ignore this entire paragraph.

  My question is this? When in the program does parport get initialized to
  inputs, and how do I make sure it is initialized before I try to drive 
it?

The direction of pins 2-9 is set when the parport.N.write is executed.
So you must addf it to a realtime thread, and start the thread, even
if you don't intend to use any outputs.

(This might be a bug - I will look into setting the port direction as
soon as the driver is loaded.)

  Thanks for your help.

Hope this is usefull, let us know what you find out.

Good luck,

John Kasunich