New Monport 40 getting ALARM:2 on initial setup

Span24 · August 23, 2025, 4:54am

Im getting a new Monport 40 ready for first print for a friend after she buggered up the mirror adjustments. Ive got them adjusted and have connected the laser to Lightburn. Start mode is ‘absolute coords’ and the laser homes properly. However, when i try to move the laser with the move buttons I get:

ALARM:2
G-code motion target exceeds machine travel. Machine position safely retained. Alarm may be unlocked. (Right-click the ‘Devices’ button to reset the connection)
On or near line 1:

Ive swapped the USB cable and even swapped computers and restarted the laser, lightburn and computer. Still no joy…

Thoughts?

jkwilborn · August 23, 2025, 9:43am

You need to figure out what alert 2 is. I’ve looked at my sources for grbl and it says error or alarm, nothing really about alerts…

On a new machine, it’s always wise to contact the vendor to at least get it operational. It’s usually 24 hours for an email each way so the sooner you make contact the better..

Here’s some grbl codes.

github.com/Sienci-Labs/Resources

gsender/gs-grbl-alarm-error-codes.md

main

---
title: grbl Alarms & Errors
menu_order: 7
post_status: publish
post_excerpt: Use this reference table to see the common Error codes and Alarm codes that you might see from your grbl-based CNC machine.
post_date: 2022-05-01 17:28:00
taxonomy:
    knowledgebase_cat: gdocs
    knowledgebase_tag:
        - gsender
custom_fields:
    KBName: gSender
    basepress_post_icon: bp-caret-right
skip_file: no
featured_image: _images/_gsender/_issues/gs_is_alarm.jpg)
---

The grbl firmware has a whole list of Alarms and Error codes that you can encounter when running your CNC. gSender will always display a question mark when there’s an alarm which you can hover over for more information about why it happened and errors will appear as a hovering box in the bottom corner of the visualizer.

You can close an alarm by clicking on the button that appears next to it in the visualizer. Most alarms can also be handled by typing “$x” into the ‘Console’ tab and hitting the ‘Run’ button.

This file has been truncated. show original

Span24 · August 23, 2025, 11:25am

Thanks for the response!

Im very sorry, I typed that incorrectly in the original post. What im getting is actually ALARM:2, not ALERT:2.

ACTUAL TEXT:
ALARM:2
G-code motion target exceeds machine travel. Machine position safely retained. Alarm may be unlocked. (Right-click the ‘Devices’ button to reset the connection)
On or near line 1:

I have corrected the original post and im hoping that this makes a difference in your response as im not looking forward to contacting the vendor in China…

Im starting to think that my friend has more issues with this laser than just mirror alignment.

Thanks!

system · September 22, 2025, 11:26am

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