Stuck configuring 5i25 to run G540

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6 years 3 months ago #173903 by naja452
Replied by naja452 on topic Stuck configuring 5i25 to run G540
Ok, I changed the Serv thread period and the P values.

The step and direction signals look MUCH better, no strange behavior.

Alas, the machine still doesn't move.

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6 years 3 months ago #173905 by tommylight
Replied by tommylight on topic Stuck configuring 5i25 to run G540
What does
mesaflash --device 5i25 --readhmid
say ?

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6 years 3 months ago #173906 by naja452
Replied by naja452 on topic Stuck configuring 5i25 to run G540

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6 years 3 months ago #173908 by naja452
Replied by naja452 on topic Stuck configuring 5i25 to run G540
Don't know if it matters, but here's a comparison of the Parallel card and the 5i25 output on step and direction for the x axis.

I'm just throwing stuff out there as I work on it.

PARALLEL CARD LEFT JOG

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PARALLEL CARD RIGHT JOG

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MESA 5I25 LEFT JOG

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MESA 5I25 RIGHT JOG

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6 years 3 months ago #173910 by PCW
Replied by PCW on topic Stuck configuring 5i25 to run G540
It might be that the bus switch has been damaged (since you have a bad output)
and is loading its 4V power supply (that sets the pass-through voltage and is just a resistive voltage divider) so you are not getting enough high side drive to generate steps

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6 years 3 months ago #173911 by naja452
Replied by naja452 on topic Stuck configuring 5i25 to run G540
I'm not a huge fan of that answer;) , but it's looking more and more like it might be the case :(

Do you know if P2 uses a different bus by chance? I ordered an adapter with the hope of reassigning everything to P2 for testing.

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6 years 3 months ago #173912 by PCW
Replied by PCW on topic Stuck configuring 5i25 to run G540
Checking the loaded output voltage would probably tell
P2 uses a different bus chip but it may use the same 4V (not sure)

If the G540 only outputs 3.3V signals you could set the I/O tolerance for
3.3V and then the bus interface chips are powered by 5V
(unfortunately the G540 manual has no output signal specs)

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6 years 3 months ago #173913 by naja452
Replied by naja452 on topic Stuck configuring 5i25 to run G540
Looks like there's a PI5C PCI bus chip for each port, fingers crossed.

EDIT: you beat me to it.

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6 years 3 months ago #173915 by naja452
Replied by naja452 on topic Stuck configuring 5i25 to run G540

PCW wrote: If the G540 only outputs 3.3V signals you could set the I/O tolerance for
3.3V and then the bus interface chips are powered by 5V
(unfortunately the G540 manual has no output signal specs)


Are you able to elaborate on this? What do you mean by "set the I/O tolerance", is this HW, SW, what device is it on etc.

I guess I don't fully follow what action you're proposing.

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6 years 3 months ago #173916 by naja452
Replied by naja452 on topic Stuck configuring 5i25 to run G540
Scratch that, I found the W3 jumper on the 5i25 that does what you suggested, I'll try that.

EDIT: I just checked the G540 Rev8 manual, looks like the spec sheet says input is 3.3-5v.

Fingers crossed!

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