Okay, If you are able to replicate your testing with logging data, I should be able to help you out once I see the logging data.

Diagnostic → Logging and hit the play button. Once you do that, the logging will start recording. You can save or copy the contents and either send the file or the text over.

I uploaded two logs. In the first log, at the beginning I jogging the x,y, and z motors and then I turned on the HC, switched to manual and tried to move the Z axis using the UP and DOWN buttons on the screen.
In the second log, at the beginning I jogging the x,y, and z motors and then I turned on the HC, switched to PINS and tried to move the Z axis using the input signal.

Okay, I'm going to need two other things from you..
1. the .set file your version of Mach is using.  I see data about the screen commanding up and down is in the screen. This .set can be found in C:/Mach4Hobby/Screens It's probably one one the ones that does not start with "wx"
"
2026-04-13 13:13:50.147

• [I    ] - Screenset H.C. Manual Commanding Down 

2026-04-13 13:13:51.658

• [I    ] - Screenset H.C. Manual Commanding Hold (~D) 

2026-04-13 13:13:53.197

• [I    ] - Screenset H.C. Manual Commanding Up 

2026-04-13 13:13:54.923

• [I    ] - Screenset H.C. Manual Commanding Hold (~U) 

"
These aren't standard MachAPI's

2. m3 script. You can find this in your C:/Mach4Hobby/Profiles/{Profile Name}/Macros/m3.mcs
This will tell me what is being called anytime you run an m3 script. If it doesn't exist, just let me know.

I am sending the files in the attachment. Thank you very much again for your help.

Hi, did you find anything out of these files?

So this is a custom setup by CNC4PC. This means that they are not using our logic to handle THC. I would recommend reaching out to them for support, they typically do a great job supporting their customers.

I will not be able to directly tell how they handle torch up and torch down with this. It looks like it is directly editing registers and I am assuming a different file is handling the core logic of how THC is handled with this version.

If you want, I can try to dig into how it's being handled.. Odds are high that the files I would need to look at are compiled as most companies prefer to protect their IP so there might not be much that I can find.. I would need the full Mach folder to attempt this.

And here is the main problem, I also wrote to CNC4PC support. They wrote back to me. But I had the feeling that the person who wrote back to me was someone who had no idea what I was writing about. I described the problems in detail, exactly like here on the forum. I wrote to him that with the older version my z-axis works and when I just copy 2 files - install the latest version - the z-axis stops working, and other details. The answer was to check the leds and when I didn't write back for 7 days they wrote back to me that they were closing the case. They made me very angry. Is it possible that I can use the original screen and M3 with this hardware and it will work? I will use anything else if I don't have to change the hardware.