I bought one of those chinese electronic handwheeels for use with Mach 3 on ebay.

(New MACH3 CNC Electronic Hand wheel For ModsMach3 Only | eBay)

After installing according to the instructions it only partly works.
The following keys work:

Origin
Cycle start
Stop
Spindle + -
Feedrate + -

E-Stop, Motion step, MPG Select do not work, but the LED´s are flashing. The handwheel does not react.
As to be expected there was not support from the seller.
I am not a computer expert so can anyone help with some advice on how to do the correct settings.