Which communication port/protocol for VFD

Hi, I could get a VFD, where I can chose the communication protocol. 
What would be the best for linuxcnc?

1. CANopen/motion RJ45
2. Ethernet TCP/IP (Modbus TCP, Ethernet IP)
3. ProfiNet (Link Layer Discovery Protocol)
4. CANopen SUB9 (canopen, canmotion)
5. Ethercat
6. Profibus
7. DeviceNET

Thanks for your help
by
Tarja

Actually most common is analog and step/direction.
From your list I'd say Ethercat might work.
Modbus is also used but using the serial port not the TCP flavour.
Mind you it would also depend on what else you need to interface to (eg the servo drives).

So if I understood right modbus only works with serial bus but not on ethernet

Maybe I will try ethercat just for fun

Modbus TCP is also usable, at least if you use the MB2HAL component.
Maybe the VFD Modbus drivers are only using Modbus RTU, I don't know.

Thanks hansu. I was not aware of that.

We then look at the different communication ports and protocols that they use.

A lot of VFD's support RS485 control so you can control from Serial port or USB with appropriate converter
You can use MODBUS or VFDMOD (V\https://github.com/aekhv/vfdmod)
I'm told that VFDmod is easier to configure.
But ask me tomorrow as that is my task for the day.

IMHO Modbus2Hal is at least at easy to configure as VFDMOD and it supports more function codes (at least in master).
Updated documentation can be found here: hansu.github.io/linuxcnc-doc/drivers/mb2hal.html