Write M code

Hi！
I want to customize an M code, I read linuxcnc.org/docs/2.8/html/gcode/m-code.html#mcode:m70 , but I still don’t know how to write it.

Thanks in advance,
Chen1234

I don't really understand the question.

Do you want to customise M70? Or do you want to write a new M-code that uses M70?

Can we start at a higher level: What do you want the customised M-code to do?

I want to define a new M code through M100-M199 to realize the function of controlling the laser, but I don’t know how to write the M code

Please don't double post. You already opened a thread here:

forum.linuxcnc.org/20-g-code/42992-how-t...cognized-by-linuxcnc

I want to define a new M code through M100-M199 to realize the function of controlling the laser, but I don’t know how to write the M code

What does the M-code need to do? You keep asking the same question, but you are not giving us enough information to give an answer.

linuxcnc.org/docs/2.8/html/gcode/m-code.html#mcode:m100-m199

(Sorry, but only parts of the LinuxCNC documentation have been translated to Chinese. If you want to submit a translation of the G-code pages, that would be excellent)

I need to add M code to control the turning on or off of the laser. I have not contacted linuxcnc before and want to know how to write or run a correct M code

The collet-closer M-code in the examples linked above should work if all you need to do is turn a GPIO pin on and off.

Or, you could use the existing coolant output pins (I doubt that a laser uses "mist coolant") and then use M7 / M9.

Hi, I'm very new to linuxcnc and this forum, so forgive me if this is easy to answer from the documentation. I'm working to build a hybrid 3D printer for metals (DED+CNC) and I'm trying to better understand what custom M code can do. Our printer will have a CNC spindle as well as a laser head mounted together. The laser is controlled using a simple ethernet interface. The laser will be plugged into a router with the desktop and MESA hardware. Is it possible to create an M-code that can be called from LinuxCNC that will allow for ethernet communications with the laser controller? As far as I can tell I can assign an unused M code to run a python function and have two parameters that can be passed. Are there any limitations on this that would prevent me from using ethernet to talk to the laser?
Thank you in advance.