modbus is a universal interface? about plugins_spindle

[terjeio]

Modbus is a communications protcol so yes it is universal. However each VFD vendor implements their own messages on top of that so a separate plugin is needed for each VFD (or each VFD vendor depending on whether they have standardized the messages across models).
Adding a plugin is not too hard if documentation is available. There is a PR for further VFDs pending, I will soon review that for merging. This may give you an idea of the work involved.

[andrewmarles]

If your VFD supports true modbus you can very likely get it working with the MODVFD mode from the above PR.