gSender corner buttons move to negative coordinates (Soft limit error)

gSender ❓ Question
1

Hi,

I’m using FluidNC (V4.9 controller) with soft limits enabled and machine coordinates set correctly.

My machine homes to front-left (X0 Y0) and everything works fine:

  • Homing works

  • Jogging works

  • Manual G53 commands work (e.g. G53 G0 X900 Y1600)

However, when I press any corner button in gSender, I get an immediate soft limit alarm.

Console shows:

G53 G21 G0 Z-1
G53 G21 G0 X-975 Y-1695
[MSG:INFO: Soft limit on X target:-975.000]
ALARM:2

So gSender is sending negative machine coordinates, even though my valid range is:

  • X: 0 → 980

  • Y: 0 → 1700

It looks like gSender assumes a different machine origin or axis orientation.

Important:

  • My setup is correct (no inverted axes needed)

  • Manual G53 moves work perfectly

  • Only UI corner buttons are wrong

Is this a known issue with FluidNC or firmware detection in gSender?

Thanks!

2

@ramiux3 I’ve moved your post into the gSender category. I believe that it will get more attention here.

3

We look at homing direction to determine how to calculate distance to each corner, and to my understanding FluidNC config is not reported via $$ so will not work correctly.

4

Yes this is an outstanding compatibility issue also mentioned on Git Y axis problem for FluidNC · Issue #525 · Sienci-Labs/gsender · GitHub

If it’s alright by you @ramiux3 we can close this one and keep the Git issue open in case it comes up again or it becomes resolved in the future