OK so finally some set up images. So if you have already done the laser set up for line art only using a vector program, then adding the DAC is way simple. The J tech web site shows what the DAC needs as far as inputs. All your doing is splicing the DAC into the system.
The MACH3 set up assumes a CRP800 with the smooth stepper and a BOB plugged into port 3 on that smooth stepper. How you run the ground, signal step and direction from the BOB to the DAC is up to you. I used one of the empty axis slots on the CRP800.
This is just a recap, setting stays the same for turning the laser on or off:
The A axis was set up to port 3:
Motor tuning for the A axis has to be changed to this:
Now with the DAC/PWM control you need a laser based program to make the code. J Tech worked hand in hand with PicLaser so for $40.00 take the easy way out and get that.
You need to set up the PicLaser settings to look like this:
A note on the pixel resolution. When you look at the set up info recommended by PicLaser they show a value of .006. I started out that way but by changing it to .008 and the image quality was improved. I think this may depend on some of the materials that you may be burning. Beam width may be a true .005, but if material on either side of that bean are charred it makes an effective .007 wide burn. Anyhow I looked an some of my first images under a 10X loop and decided that there was too much overlap. Yours make work best set at .006