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Re: Only X-axis motor is working
« Reply #70 on: March 27, 2018, 01:12:52 AM »
So, here's where I am.

I took a look at this video
https://youtu.be/uglCm_qsojk

Then I did what the video said.
I hooked the ground to pin 25 and then the positive on the multimeter to pin 2. It was reading 3.3V
I checked pin3 and it read zero. Then I pushed the up and down arrow and the output changed to 3.3V
I checked pin 4 and it was zero. I used the page up and page down and the pin read 3.3v.

The interesting part was that, once the pin went high (3.3v) it wouldn't go low again.

Still trying to figure out why X will work, though.

I only tested pins 2,3,4 this way. If they don't go low then there appears to be a problem in the computer.

Offline olf20

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Re: Only X-axis motor is working
« Reply #71 on: March 27, 2018, 06:51:49 AM »
It appears those pins are setup as direction pins.
If you move those axis in the other direction the
pins will change state.

olf20 / Bob
Mach3, Atlas Knee Mill, 4th Axis, VcarvePro, ESS, Super PID.
Been Heating with corn since 1998
Re: Only X-axis motor is working
« Reply #72 on: March 27, 2018, 10:03:07 AM »
It appears those pins are setup as direction pins.
If you move those axis in the other direction the
pins will change state.

olf20 / Bob

I was just doing what the video was saying to do. It was only to check to see if I was getting proper responses from the output pins on the parallel port.

I discovered that I can get all of the 8 "data" pins to function properly. I also discovered the left and right arrows on the X axis don't control both directions. Left controls the minus movement but "X" key on the keyboard controls the plus movement.
Likewise for Y and Z
Down arrow controls minus on Y and the "Y" key controls the plus.
Page down controls the minus on Z and "Z" controls the plus.

So, the parallel port is verified as functioning properly. Tonight I check the parallel cable the same way. If the parallel cable is working normally then I have verified that the BoB is the culprit.
Re: Only X-axis motor is working
« Reply #73 on: March 27, 2018, 03:35:53 PM »
Hi,
sounds like the parallel port of your PC has 3.3V output levels.

Is the BoB you are using 3.3V capable? If it is expecting 5V inputs it might describe your situation.

Craig
My wife left with my best friend...
     and I miss him!
Re: Only X-axis motor is working
« Reply #74 on: March 27, 2018, 03:40:50 PM »
Hi,
sounds like the parallel port of your PC has 3.3V output levels.

Is the BoB you are using 3.3V capable? If it is expecting 5V inputs it might describe your situation.

Craig
That's a good point.
I should look into that further.

Thanks for pointing it out.
Re: Only X-axis motor is working
« Reply #75 on: March 27, 2018, 10:21:01 PM »
Here is one absolute that I got from my diagnostics.

Pin 2 on the parallel port emits on pin 3 on the cable.

It's a brand new cable and it's bad.

I suppose I could use a multimeter and map out the cable to find out if all the pins are off one or if they are all connected or whatever and then remap the program based on the outputs.

Or I could buy a new cable.

Offline rcaffin

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Re: Only X-axis motor is working
« Reply #76 on: March 27, 2018, 11:12:38 PM »
Pin 2 on the parallel port emits on pin 3 on the cable.
HANG ON!
Where are you getting your pin numbers from?
The pin numbers seen on a ribbon cable connector are NOT the same as the numbers we use for I/O pins on the PP. In particular, pin 2 in CNC numbering scheme is pin 3 on a ribbon cable.

Cheers
Roger
« Last Edit: March 27, 2018, 11:23:41 PM by rcaffin »
Re: Only X-axis motor is working
« Reply #77 on: March 27, 2018, 11:29:48 PM »
Pin 2 on the parallel port emits on pin 3 on the cable.
HANG ON!
Where are you getting your pin numbers from?
The pin numbers seen on a ribbon cable connector are NOT the same as the numbers we use for I/O pins on the PP. In particular, pin 2 in CNC numbering scheme is pin 3 on a ribbon cable.

Cheers
Roger

It was a simple continuity test.

Here's where I stopped

Offline rcaffin

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Re: Only X-axis motor is working
« Reply #78 on: March 27, 2018, 11:40:16 PM »
Ahhhh ...
I am not entirely sure I understand your diagram. If it really means that you got continuity between p21 at the left side and pin4 at the right side, then I am boggled. That is NOT a DB25 extender cable!!!!!!! I dunno what it is!
Re: Only X-axis motor is working
« Reply #79 on: March 27, 2018, 11:57:37 PM »
Ahhhh ...
I am not entirely sure I understand your diagram. If it really means that you got continuity between p21 at the left side and pin4 at the right side, then I am boggled. That is NOT a DB25 extender cable!!!!!!! I dunno what it is!

That is exactly what it means. I got continuity between pin 4 and 21.
I can't reassign that.

If I couldn't get another cable tomorrow, I'd split the cable and manually rewire it all for a test. For now I'll wait.