Jeshua Lacock wrote: > Greetings, > > I was thinking of controlling my CO2 laser intensity using the Z value in the > G-Code. > > Maybe I could use 0-1 for 0% to 100% percent, or perhaps 0-255. > > I have a Pico Systems DAC board that outputs 0-5 volts that in turn will > control the laser power from 0 to 100%. > > Can anyone suggest how I could configure LinuxCNC to control the DAC from Z > values? > > Are you using this with a Pico Systems Universal Stepper or PWM Controller? If so, just connect the commanded Z output to the DAC input with proper scaling. The Z output will be axis.2.motor-pos-cmd, the input to the DAC is
ppmc.0.DAC8.00.value There is a scale factor for this DAC port, it is set like this : setp ppmc.0.DAC8.00.scale 500.0 The above setting would make an input value of 500 give full-scale output from the DAC, or 10 V. SSR1 needs to be turned on for a positive output from the DAC. SSR2 will give a negative output. There is a command line option that needs to be added to the loadrt command to activate the spindle DAC port, it should look like this : loadrt hal_ppmc extradac=0x00 If you are NOT using one of our controller boards, then you need an 8-bit TTL port to drive the inputs to the DAC. It could be a parallel port or 8 digital output pins on an interface board. If you need the pinout of the DAC board, I can get that for you. (I ought to add that to the documentation page.) Jon ------------------------------------------------------------------------------ Monitor your physical, virtual and cloud infrastructure from a single web console. Get in-depth insight into apps, servers, databases, vmware, SAP, cloud infrastructure, etc. Download 30-day Free Trial. Pricing starts from $795 for 25 servers or applications! http://p.sf.net/sfu/zoho_dev2dev_nov _______________________________________________ Emc-users mailing list Emc-users@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/emc-users
