Remora - ethernet NVEM / EC300 / EC500 cnc board

Looks OK, You can also use the 26LS32s for single ended by
providing a reference voltage and a jumper. The old
LSTTL 26LS32s tend to be more rugged than the newer CMOS
versions as they will accept +-25V common mode spikes
without damage and the CMOS versions are damaged by
>14V or so.

Thanks PCW, it is good to have your opinion on the design, I will replace the C series with the LS series for the differential receivers, I plan to have some boards manufactured by jlcpcb, greetings

To late...

Is there isolation on the Mesa boards between the differential driver signals and MCU ?

Hello, this is a reply to beauxnez post from few days ago.

"hello, is it possible to make an nvem card work with qtplasmac?"

 The answer is yes, another friend and myself are right at the end of a plasma machine build, were using a ec500 as the controller and it works fantastic with qtplasmac. I will say the THC is the only thing that we don't have working at the moment. On ours the plasma output is just on output 1, torch is either on or off. It goes from the board and turns a relay on and off which is the actual switch. For ours we have a Everlast 82i for the plasma cutter which has a 50:1 voltage divider, that gives us a 0 - 5v output for the torch voltage but from my understanding there aren't any analog inputs on these boards. A analog to digital converter may be a option. I'm not sure what the output of the mesa THCAD boards looks like, there may be a way to use one of those. I'm just getting started on trying to setup a arduino to take the analog voltage, work some magic on it, and send the info to linuxcnc that way using modbus.  The downside I'm seeing to this approach is effectively I'm setting up a second controller to take just one analog input, and I'll have to put a switch inline on the ethernet cables.  The upside is another controller and analog input, so now I can dream up more features to add to this machine (During our build process it started as a basic machine, we now have individual limit switches for every axis, probing, etc. , touchscreen interface, and so on..) 

Here's the ini and hal files of of my machine.  These are off of a plasma running a ec500 and QTPlasmaC, machine is fully operational with the exception of THC.  I'm in the us so the machine is set up for imperial units.  The machine has two motors on the x axis moving the gantry (Joint 0 and 3).  Other things to note is the breakaway on the torch has two prox switches on in hence the need for the and2 component on those and we have a WHB04 wireless pendant so that is loaded in the ini file. The limits are all micro switches, and there are separate prox switches for homing on the x and y axis.  The z axis uses the same switch for limit + and homing.  If I remember right I started with the generic hal that came with remora and tweaked it from there.  Just take it one input at a time.

If I remember in the next day or so, I'll post the .ini and .hal for our machine. I have a working machine running on a ec500. That way you can dig through it and be totally confused by it, lol.