Laser Output

jay_s_uk

@Macwolf you can use laser or vfd as shown in the source here https://github.com/Duet3D/RepRapFirmware/blob/f6e475196704a19df10149f61dde4d5a2d6b5e81/src/Config/Pins_Duet3_MB6XD.h#L206

T3P3Tony

@Macwolf (and anyone else reading this later)

It's in the documentation here:

https://docs.duet3d.com/en/Duet3D_hardware/Duet_3_family/Duet_3_Mainboard_6XD_Hardware_Overview

In the "Pin Names" section.

Macwolf

@T3P3Tony many Thanks is OUT 6 in the documentation

Macwolf

@jay_s_uk Thanks, I didn't know that this source explained it.

jay_s_uk

@Macwolf @T3P3Tony I don't think Out6 and the VFD/Laser pin is the same. The source indicates they are different, in which case the pin names section is incorrect. This may be a carry over from the 6HC which shares the VFD output with out6

T3P3Tony

@jay_s_uk thanks, that is a good spot! You are right, its on its own pin on the 6XD.

@Macwolf using "vfd" is correct.

@droftarts - docs updated.

Macwolf

the Duet board is configured, I use a CO2 tube. A "tool" is configured, see Config, but there is a problem, when I start up the machine, the laser is active!!!
I use the active high input on the laser power supply.
Markus
config.g

jay_s_uk

@Macwolf you may need to invert your signal.
When i ran a K40 laser (CO2 tube as well), i used the negative side of a hotend output

Macwolf

@jay_s_uk
M452 C"! Laser" R255 Q500;
no change. or how to use the negative output

jay_s_uk

@Macwolf try wiring the laser fire pin to the negative of out0, 1 or 2 and change your config accordingly.
you can see more detailed wiring for the K40 here https://github.com/TeamGloomy/LPC-STM32-RRFUserConfigs/tree/master/K40 CO2 Laser - SKR 2 - ESP - paulg4h to see if that marries up with your machine

Macwolf

@jay_s_uk
A technical question: How much frequency does a 40W CO2 laser tube need? In your example, is the Q value 5000? Or does that not matter.
I am new to this area and am wondering whether I am implementing it technically correctly. There were no operating instructions included, neither with the power supply nor with the tube.

Markus

jay_s_uk

@Macwolf IIRC, the 5KHz came from previously available information from when people were converting the K40 away from the original controller to boards that use GRBL etc