Hey David,
the difference between the buildbotics-derived Onefinity Controller and the MASSO G3 is that you have no Modbus over serial line support. Instead, the MASSO controls the VFD/spindle SPEED over the analog voltage interface and RUN/STOP/CCW over a programmable VFD terminal. Mainly the table in this page applies, with the following pin names: “O” is “AI2” (=the analog voltage input) and “1” is “S1”, “2” is “S2” (=the programmable terminals for CW RUN/STOP and CCW RUN/STOP). The bridge must be changed from PW to +24V instead of PW to COM.
All VFDs that I know offer a analog voltage (Volts) or analog current (Ampères) speed control as fallback, and programmable terminals for RUN CW/STOP and RUN CCW/STOP, so this way of controlling a VFD practically always works.
The settings inside the VFD are always called something like “Source of RUN command” and “Source of SPEED command” or “Source of FREQUENCY command” and for the Original and Pro Series, you had to set both to “Modbus Serial Interface”, which now with the MASSO has to be changed to the analog voltage input and the programmable terminal respectively. You need to assign one programmable terminal for RUN/STOP and if you need counter-clockwise rotation (which is the case if you want to use RapidChange ATC (Onefinity offer) – not necessary on “normal” ATC spindles like this one) another programmable terminal. The programmable terminal 1 must be assigned to clockwise run, and the the terminal 2 to counter-clockwise run.