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I don't think you can control the spindle speed with this board as it doesn't have an analog output or speed controller built into it. The speed control it mentions in the manual I think is an analog...

I would suspect that the "pin number" is referring to the microcontroller, or the simulated LTP port, so its not straight forward. Pin 1 goes to that relay, and by the looks of things pins 2 and 3 go...