RS485 spindle control

Ryan Matthews found a way to control the spindle of the same YOOCNC CNC6040 mill I have via RS485.
So I just ordered myself a USB-RS485 adapter.
Let's just say that I don't recomment the "ColorApples Cool Gadgets Mall.". Their Paypal checkout process is broken beyond repair.

•  Google+ posting
• Ryans posting about the RS485-control
• The MACH3 plugin he mentioned
• first and second manual he digged up.

(I'm doing these postings mainly for my self, so I can find these links without digging through my Google+ history.)