PDM

I have a WK-3300 Casio and WIndows 10 64 bit computer. Have installed the driver and windows can see it. In mixpad Masters software I can select MIDI device as input but I cant get any transfer from the keyboard to the computer. Do I have to do something else on the keyboard to get it to work ? I know its connected because the MIDI option disappears as an option for input when I disconnect it.