Single Command Mode: In this mode only one command is sent to GRBL(G-Code Enterpeter) at a time. It will wait for the machine to go into idle mode before the next g-code command is sent. Command ...
The open-source grbl project has produced software that allows an Arduino to control a three-axis CNC machine – it is the software within ‘3018’ and related low-cost Chinese-made CNC desktop routers.