On my Mac:
My Mac showed connection made, but I could never get Repetier to actually connect. But I could get CNCjs to work with a Mac.
On my PC:
Using the USB-B to USB-A cable, connect the controller board (not the display board) to your PC.
In Repetier-Host, use the following settings in Config->Printer Settings on the Connection tab. And set the Com port to whatever Windows assigned to your board.
You should be able to send gcodes on the manual control tab. Make sure to use UPPER CASE commands. Official gcode does not recognize lower case.
You should also turn on commands in the log to be able to see both sent and response commands.
