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  • freemoore
  • freemoore
19 Oct 2025 14:36

hm2_modbus, mesa modbus, vfd modbus, mesambccc - example configs/intro?

Category: Advanced Configuration

Hi all,
I'm working on a machine with 7i96s for brains and a 7i75 for IO. I'm adding a fuling BD612 VFD so i can use the high rpms that the spindle is capable of, and I'd like to do this via modbus.

I'm aware of the hm2_modbus and mesambccc manpages as well as the docs page Mesa Modbus, but... I can't tell if they are referring to the same thing. It seems clear that vfd_modbus and mb2hal are different ways to do this.
I'd be grateful if someone could confirm that these refer to the same thing or different things...

It's clear that hm2_modbus and mesambccc are parts of the same system - does anyone have an example file(s) for setting these up? I'm happy to spend hours with the manpages and guide but get on far better reading and tweaking existing code, than trying to write it myself from scratch.

I've flashed the 7i96s_pktv3.bin bitfile successfully, not sure of next steps. 

Many thanks,
Andy

 
  • PCW
  • PCW's Avatar
19 Oct 2025 13:07

Stepper motors should hold position when error.

Category: General LinuxCNC Questions

Does the drive itself power down on a fault?
  • PCW
  • PCW's Avatar
19 Oct 2025 12:58
Replied by PCW on topic 7i96 sand Spindle Servo

7i96 sand Spindle Servo

Category: Driver Boards

7I96S        DRIVE CN3

ENCA+          9
ENCA-         18
ENCB+        17
ENCB-           8
IDX+             7
IDX-            16

STEP+         2
STEP-         11
DIR+           4
DIR -          13

GND          12   (encoder ground= 7I96 TB2 pin 9 )
 
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