Brand new machine, Altmill 4x4. Just got it started went to cut my first job and use the autozero touch plate. Everything on the machine works and this was the last thing to test. I can home the machine, the spindle works over Modbus etc. On Gsender, 1.6.3, the Probe input is always green. If I touch the wires together it doesnât go out so the configuration doesnât seem inverted. Nothing I do seems to get the signal to turn off.
The other inputs for X limit Y limit work as expected.
I thought maybe the cable was shorted. Pulled the cable from the controller. Same thing even with no cable connected to the controller, the probe input on GSender says itâs on.
If I plug the cable back in and look at the LED on the board, it does light up when the wires touch. So hardware wise it looks like it is working correctly.
I updated Gsender to 1.6.3 from 1.6.2. No change.
I updated the FW on the SLB-EXT. No change.
I tried changing the input parameter in GSender. No Change.
If I tried to use the probe routine I just get an error that the probe is in the wrong state meaning it is made before starting the cycle. So I canât use the touch plate at all right now. I tried calling tech support but they are out for the rest of August conveniently.
Anyone seen this before and got it fixed?


