How to send g-code to printer using Host
I am trying to calibrate my X and Y axes, and need to send the M503 command to the printer to see what the current values are.
But when I use the Manual Control section of the GUI to send "M503" I get a "Unknown Command: Nxxxx M503". So what is the correct incantation to send a command to the printer. It's not obvious from the documentation.