Example commands to communicate with GRBL. Soft reset $$ $G Unlock $X Jog left $J=G21G91X-50F2 Jog right $J=G21G91X50F2 Circle G17 G20 G90 G94 G54 G0 Z0.25 X-0.5 Y0. Z0.1 G01 Z0. F5. G02 X0. Y0.5 I0.5 J0. F2.5 X0.5 Y0. I0. J-0.5 X0. Y-0.5 I-0.5 J0. X-0.5 Y0. I0. J0.5 G01 Z0.1 F5. G00 X0. Y0. Z0.25