List available serial ports

Get current CNCjs connection status

Get full GRBL machine state (positions, feed, spindle, overrides, buffer)

Get current machine and work positions (X, Y, Z)

Get work coordinate offset (WCO) values

Get all GRBL $$ machine settings with labels

Get active G-code parser state (WCS, units, distance mode, etc.)

Get currently loaded G-code file name and content

Get current job progress (lines sent, elapsed time, % complete)

Get workflow state (idle, running, paused)

Get feeder queue depth, hold state, and reason

List all CNCjs macros (name, id, content)

List machine profiles with travel limits

Get current alarm code and human-readable meaning

Open a serial connection to a CNC controller

Close the current serial connection

EMERGENCY STOP — immediately halts all motion via GRBL soft reset (0x18). Use in any dangerous situation.

Feed hold — controlled deceleration to stop. Safer than emergency stop for non-critical situations.

Send one or more G-code lines to the machine. HIGH RISK — causes physical motion.

Load G-code content into CNCjs for execution

Start executing the loaded G-code program

Pause the current job (feed hold + pause sender)

Resume a paused job

Stop the current job

Run GRBL homing cycle ($H). Machine must have homing switches enabled.

Clear GRBL alarm state ($X). Use after resolving the cause of the alarm.

Jog the machine incrementally. HIGH RISK — causes physical motion.

Adjust feed rate override (10-200%)

Adjust spindle speed override (10-200%)

Execute a CNCjs macro by name or ID. HIGH RISK — macro content may cause motion.