GRBL connection and status errors

Use Machine → Machine control to read the connection state and its latest detail. Match the detail to the selected profile and COM port.

The port is missing or busy

1. Check whether the device appears under Ports (COM & LPT) in Windows Device Manager. If it is missing, check the USB data connection and the manufacturer’s driver instructions.
2. Select the actual COM port in LaserStudio. A profile imported from another PC needs a new port selection.
3. Close other apps using the same port. If Machine Control shows Disconnecting, wait for that operation to finish before retrying.

The port opens but status never arrives

Distinguish Reading settings from Waiting for status. Record the last connection detail. Check that the selected controller type and baud match the manufacturer’s settings.

The controller reports a profile mismatch

Compare the reported travel and maximum S with the bed dimensions and numeric power scale in the saved profile. The setup wizard can copy reported values to the profile form for review. Resolve the mismatch before requesting motion.

Capture the diagnostic summary

Use Export diagnostic summary in Machine Control. Include the JSON, the controller model and the step where the connection failed when reporting the issue. The summary records the state at export time. If a position report has gone stale, record that too.