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Theres no vfd there’s a image of what im trying to hook up in a earlier post
im trying to find out how to get variable voltage 

natas01 wrote:

so would the spindle enable be the variable voltage

No, spindle enable is just enabling the VFD, speed is controlled by variable voltage.

The 0-10 volt to control the speed

Hi @cmorely, any news on this issue?

Best Regards

Not sure what you mean here

At the physical interface level there is no enable, but rather FWD and REV

 

so would the spindle enable be the variable voltage

Sorry, I was wrong:

The SSRs (that you would use for spindle FOR/REV) are on TB3,
but the PWM controlled analog output is on TB2

ok im starting to understand
but not the speed control PWM?

Step/Dir index support with Mesa hardware does not need any
programming, just the correct firmware and a minor hal change:
 
Replacing the encoder index  enable with the stepgen index enable.

It's likely possible to do this with programming but that has the disadvantage
of having an index detection uncertainly of a thread period.

Does your current setup have inputs available for index inputs?

Thanks for the answers. As I understand it, the differences in the answers mean that there is no single solution in the system. Why is such a question even raised? Systems with hybrid or servo drivers already cost almost the same as stepper motors. Of course, if a person does not use Sinumerik, Fagor, Fanuc, he is looking for a way to save money. Therefore, the 7i92 + 2 x ABOB combination is simply an ideal solution for the price of quality. And to make your own hobby machine with perfect homing, and even at a low price, it is impeccable.
It is also clear that this functionality can be implemented programmatically. I will also try to find the firmware you are talking about. Does it mean that in the firmware the encoder index is untied from the counter?
I will try to implement this using the GPT chat, but I do not think that I will succeed with my little knowledge of code programming.
With respect

That's what I figured to try first. Wiring it up to make a 5v Field B right now and then I'll move the MPG over and try it
Thanks again,
M

There's no current way to support differential inputs on the 7I84/7I84U
I would just use a differential encoder single ended (just use A+,B+)

Thanks for that clarification (never would have figured that one out)
Any guidance on the change to mode 2 creating two separate A/B single ended encoders or one A+/A- B+/B- differential ?
Thanks
M

That looks correct except you do not change the number of encoders:
"num_encoders"  as this only applies to high speed encoders, not sserial devices.

Question. If I use speculative memory access via _mm_prefetch (SSE instruction), does it affect the Linux CNC kernel? I am using this on RAW L2 Zero Copy sockets. I ran it, it seems to work, Axis (Linux CNC) doesn't break. Are there any restrictions on what can be used programmatically when writing drivers for Linux CNC?

Question 2.