[mycnc000]

Hi!
It will be great if you give any information about your Break Out Board.

In the proma manual I see that STEP / DIR Inputs and Outputs TTL 5V, 470 Ohm +5V PullUp inputs.

I think - you have to connect Gnd output from BOB direct to 18 (18-25) pins of the G540 LPH26pin connector and (-)power of the Proma.
Pulse(+) and Dir(+) BOB output to StepIn and DirIn inputs of the Proma. StepOut and DirOut of the Proma to 6 and 7 pins of the G540 LPH26pin connector.

My controller has common +5V Pulse/Dir interface and for connection to the G540 I use small BOB with Hi-speed optoisolations.

Torchhead is right - during cutting with Proma SD height control Mach3 has no information about torch position. Maybe for you it does not matter, but you should know this.

My bob is a gecko g540 on ebay there is a proma 150 thc that has a diagram for wiring it up to the gecko g540
I sent my proma SD back and he is sending me the 150 now I just have to wait two weeks lol