Netmos 9865 pci parallel port help

chadrat6458 wrote:

Ok, I got the multimeter out. I have 5v all the way out to the drivers

Do you have 0V all the way to the drivers too? By which I mean, do you see the direction signal change value when the axis changes direction?

What step timing numbers are you using? Maybe the step length is too short, or has the wrong polarity.
Can you show us a diagram of exactly how the BoB is connected to the drives?

If it is wired exactly like that, then the input opto-isolators of the drives have 5V to their + terminals and the signals to the - terminals.
This means that the LED inside the opto-isolator will light when the step pin is 0V and go out when the output is 5V. (you need to think in terms of current flow, not voltage levels, with opto-isolators).
The net effect of this is that the system uses 0V for step pulses and 5V for between pulses.

If your multimeter shows the STEP pins as 5V when idle (and probably also when stepping, a multimeter won't see the pulses) then you have things configured correctly. If it shows 0V when idle then you need to invert the step pins in stepconfig. (it's a checkbox next to each pin allocation box).
You can also use this checkbox to reverse your motors if the axes move the wrong way, by inverting the sense of the DIR pins.

There are a couple of latency tests, one on the menu and one you can run from a terminal. Open a terminal and run latency-histogram. Let it run for at least an hour. Don't run LinuxCNC at the same time as a latency test.

JT