Hey Julian,
you don’t read my posts, do you?
I already wrote you this:
So NO, I repeat, you don’t connect any other pins except pins 13 and 14 for Modbus control over the RS-485 serial connection to your VFD!
No, this is wrong and not the way you start and stop a spindle on a VFD. As explained above, if you have Modbus connection, you simply start the spindle with the g-code commands ➪ M3 (start spindle) ➪ Sx (where x is not 0) and stop it with ➪ M5 (stop spindle). You need no other connections, because the Modbus over RS-485 serial interface on pins 13 and 14 transmits all necessary commands. With Modbus, you control the VFD/spindle only by the g-code commands, either manually entered into the command entry field of the ➪ manual data interface (MDI) (in the tabbed section of CONTROL page), or when they are encountered in a running g-code toolpath.
And, again, I repeat, you got to find out yourself by using the search function what the FA FB FC outputs are for.