I use a Masso G3 as my CNC board

I need some help with my THC controller.
The THC is a PlasmaSensOut from PoLabs: https://www.poscope.com/wp-content/u...ual%20v1.2.pdf
I understand that the Proma THC is basicly the same (?)

What I need help with is understanding the wiring of the outputs.

There are 6 terminals on the THC.
5 and 6 are the 24VDC go get the THC to work
1 is output for THC UP
2 is output for Arc OK
3 is output for THC DOWN
4 is output for Common

I have connected this up with my plasma machine and the THC is reading the voltage just fine and the UP and DOWN triggers are trigged when cutting. So far so good

But the outputs 1, 2 and 3 are not giving me any output/voltage?

1, 2 and 3 is wired into "input" terminals on the masso and 4 (common) is wired to my PSU minus (-)
What am I suppose to expect to happen? When I test the THC there is no voltage on either 1,2 or 3.
If I wire up 4 to the plus (+) terminal on the PSU, 1, 2 and 3 all show 24V all the time.

To be frank, at this point I don't know what to ask for

Can anyone help me understand how the outputs work?

I am new to this, so please go easy on me if this is a supid question