There have been a few improvements to the ESS firmware since this instruction were published and you can see information on all releases of their updates on the Warp9 forum once you join the community at There are very good instruction on the Warp9 site to help configure things, The laser power is controlled by Pules Width Modulation, PWM, which is generated by the ESS this is switched on and off by a gate. To help others to get their laser connected to an ESS and Mach4 here is a bit of a guide. Recently Andy from Warp9 has incorporated some macro codes in the ESS to manage both vector and raster laser burning which has taken some of the processing load off Mach4. Around this time I purchased an Endurance Laser 10 watt+ and with the help from SmoothStepper and Endurance community got it going on my machine. I then discovered the Wrap9, the SmoothStepper developer, was working on improvements for controlling lasers.
Then I found that Mach4 had M63Px and M63Px designed especially for lasers, these turned the laser only when there was movement and off when movement stopped so I moved to Mach4 for my laser. Because of this delay, I started using M11Px and M10Px to turn the laser on and off and this was working fine. One of the very early lessons was that there is a delay with the laser coming on after an axis move and going off once the movement has stopped when using M3 and M5 to control the laser. My initial laser was a 3.8 watt from Jtech which helped me learn about laser control. This uses a SmoothStepper to control the movement of the axis and run under Mach3. I started with a CNC Router Parts, now Avid CNC, Pro4896 router kit I built a few years ago. “Here is a bit of background on my laser experience. Getting an Endurance 10 watt laser going with Mach4 and an Ethernet SmoothStepper.
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