Can I drive a BLDC driver with this diagram?
The manual is very poor. I would recommend you that upon receiving the item you open the case and see what's inside. The drive can already have the optocouplers inside, so you will only need a NPN transistor and base resistor to control the digital inputs. The external setpoint speed potentiometer is not necessary if you use a in-built one.

EDIT:

Possible scenario once you open the case (the good scenario):

PAy attention to the voltage source - it should be galvanically isolated type.







simulate this circuit &ndash; Schematic created using CircuitLab

The other scenario (no galvanic isolation built in BLDC driver):







simulate this circuit

See this:

The DI internals are depicted as LEDs (maybe optocoupler LEDs?)