Were is there a ICM/TTL on the Pic-Convert DAC/PWM board? I only know of a PWM/Analog output jumper.
So I guess whats really confusing here is that you say to use the A axis, but in the code for the Pic I just made it shows a Z-.0255 using the Analog/PWM profile. So what we have here is the A axis and the spindle. A negative Dir turns on the laser as well as M3. A positive and M5 turn it off.
The M03/M05 is for turning on/off anything (spindle, laser, solenoid, ect with a relay). The Pic-Convert board varies the modulation to the laser driver with Z, A,B or C axis step and direction signals to laser engrave grayscale. It has a relay on the board to turn it on/off with a M03/M05 too. I use the A axis because my Mach3 machines have a Z axis you move the laser's focal point up and down based on material thickness. You can change the 3rd axis letter in PEP5.
I suggest you read through my instructions in this thread again and the J-Tech laser driver & Pic-Convert manuals.https://jtechphotonics.com/wp-content/u ... c-V1_2.pdfhttps://jtechphotonics.com/wp-content/u ... l-V2_6.pdf
Here is the Mach3 manual if you don't have it. http://www.machsupport.com/wp-content/u ... l_1.84.pdf