I realize this isn't completely a MACH question but many MACH users have G540's connected to their systems.
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The VFD pins are the ones I'm wondering about.??? The specs say optically isolated PWM.? Is this as simple as an opto-isolator on Pin14 of the DB-25 and a capacitor connected to the output transistor to create the DC from a PWM output?
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Instead of 10V (Max 12V according to the data sheet) to the VFD-10V input POS9 on the terminal strip if instead 5V was connected would an end user see 0-5V voltage for 0 to 100% PWM?
