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  • mooser
  • mooser
14 Mar 2026 22:38
Replied by mooser on topic 7i84u - Mode 2, MPG and power connections

7i84u - Mode 2, MPG and power connections

Category: Driver Boards

(Just realized I posted this into general instead of under boards, maybe I can get someone to move it.)

I got just the encoder itself moved over to the 7i84u
#net jog-counter <= hm2_7i96s.0.encoder.00.count
is now
net jog-counter <= hm2_7i96s.0.7i84.0.0.enc0.count
and it's working as it should

But these lines don't seem to work anymore or I'm referencing them incorrectly
#setp hm2_7i96s.0.7i84.0.0.enc0.counter-mode 0
#setp hm2_7i96s.0.7i84.0.0.enc0.filter 1
From what I'm reading those don't exist on the 7i84u in mode 2
Something I need to do some other way or something I don't need to worry about ?
M
  • natas01
  • natas01
14 Mar 2026 22:23 - 14 Mar 2026 23:02
Replied by natas01 on topic pin locations

pin locations

Category: General LinuxCNC Questions

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 
  • tommylight
  • tommylight's Avatar
14 Mar 2026 21:41
Replied by tommylight on topic pin locations

pin locations

Category: General LinuxCNC Questions

so would the spindle enable be the variable voltage

No, spindle enable is just enabling the VFD, speed is controlled by variable voltage.
  • natas01
  • natas01
14 Mar 2026 21:39
Replied by natas01 on topic pin locations

pin locations

Category: General LinuxCNC Questions

The 0-10 volt to control the speed
  • Mr1576
  • Mr1576
14 Mar 2026 21:16
Replied by Mr1576 on topic qtdragon_hd updated handler issue

qtdragon_hd updated handler issue

Category: Qtvcp

Hi @cmorely, any news on this issue?

Best Regards
  • PCW
  • PCW's Avatar
14 Mar 2026 21:16
Replied by PCW on topic pin locations

pin locations

Category: General LinuxCNC Questions

Not sure what you mean here

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

 
  • natas01
  • natas01
14 Mar 2026 20:37 - 14 Mar 2026 20:37
Replied by natas01 on topic pin locations

pin locations

Category: General LinuxCNC Questions

so would the spindle enable be the variable voltage
  • PCW
  • PCW's Avatar
14 Mar 2026 19:57
Replied by PCW on topic pin locations

pin locations

Category: General LinuxCNC Questions

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
  • natas01
  • natas01
14 Mar 2026 19:20 - 14 Mar 2026 19:44
Replied by natas01 on topic pin locations

pin locations

Category: General LinuxCNC Questions

ok im starting to understand
but not the speed control PWM?
  • PCW
  • PCW's Avatar
14 Mar 2026 18:59 - 14 Mar 2026 20:27
Replied by PCW on topic Again about HOME_INDEX in step/dir mode

Again about HOME_INDEX in step/dir mode

Category: StepConf Wizard

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?
  • Taichi
  • Taichi's Avatar
14 Mar 2026 18:43
Replied by Taichi on topic Again about HOME_INDEX in step/dir mode

Again about HOME_INDEX in step/dir mode

Category: StepConf Wizard

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
  • mooser
  • mooser
14 Mar 2026 18:39
Replied by mooser on topic 7i84u - Mode 2, MPG and power connections

7i84u - Mode 2, MPG and power connections

Category: Driver Boards

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
  • PCW
  • PCW's Avatar
14 Mar 2026 18:19

7i84u - Mode 2, MPG and power connections

Category: Driver Boards

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+)
  • mooser
  • mooser
14 Mar 2026 17:33
Replied by mooser on topic 7i84u - Mode 2, MPG and power connections

7i84u - Mode 2, MPG and power connections

Category: Driver Boards

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
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