Chinese AASD Drive for Spindle Motor

I am retrofitting a Bridgeport Series II knee mill with a Chinese AC servo and drive 'kit'. I would like to rigid tap and use spindle orient for probing operations. I'd like to keep control entirely within LinuxCNC and control the drive in velocity mode. My mill has a 7i77 with spare encoder inputs and differential outputs and ideally I'd like to control the spindle the same as the other axes on the mill, with a differential +/-10V signal. 

The manual lists two pins for the 'analog voltage input port' and states 'voltage input range -10V~+10V'. This is a picture of the inputs in the manual.
https://drive.google.com/uc?id=1GViEE9WZwYFsdYNB80LrunosXCbfN517

Removed due to incorrect information posted. 

Thanks!

I should have done some more research before posting, it seems quite obvious now.