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Yes,

the motor driver detects the fault and sends the signal to the the mesa. When driver detects the fault it also disables the motor (causing the z axis to fall). What I want is for the driver to stop the motor and hold position when it detects a fault not disable it.

Routerworks wrote:

... I simply want to be able to draw something in Inkscape, some closed loop and some curved lines that are not connected beginning to end, export it as a svg, import it into something and generate a g code.

Why would you export that as SVG when you CAN export it as gcode from Inkscape ????
Here is a quick video, just choose a mill instead of plasma:

Some tips:
-you can not export objects as gcode, only paths, there is a menu for converting things to path
-same goes for text, convert to path before exporting
-while Inkscape can do depths, it can do steps, probably not usable for depth maps

Awesome thank you!

I got a little more work done this morning, the PC now boots up when power is applied, the impulseformer is wired to 12v but I found the 5v is not hooked up to the correct pin, Chinese wiring diagram or I was wrong not sure yet, and all the raceway is snapped back into place so you can't see the rats nest of wiring. Should hopefully have the machine scales reading something when I find the correct wire for 5v. All of the other pins rung out correct so it's just the one color wire. I ordered a touchscreen interface so I should be starting the build for the control panel when that arrives. I need to decide if I want the jog wheel on the interface or on a pendant or both. Regardless I have a 7i73 for that stuff. I am considering implementing a 4x20 LCD display into the pendant control but don't know if that would really add any value as my touch screen will be fairly large and easy to read or I hope from a distance.

“This header has a pin-out that matches a standard parallel port.”

This is true and it electrically matches  standard parallel port in terms of drive
and overvoltage capability.

PC parallel ports are also not suggested for direct connection to motor drives
where a single wiring mistake can permanently damage a motherboard.

It is possible to use the outputs of P2 directly (as you can with a PC parallel port)
but  care must be taken to avoid even an brief contact to a voltage  outside the safe range.

7i97t_5abobd is designed to interface to the common Sainsmart 5 Axis BOB:

www.amazon.com/SainSmart-Breakout-Board-...Driver/dp/B0093Y897A

As tommylight mentioned, eusurplus is a Mesa distributor and they currently have the 7I97T in stock.

Also as I mentioned, your damaged 7I97T is very likely repairable.

To be honest I had no idea linuxcnc had software that would generate g code. When I started with this a few years ago I have been using Freecad to design different mechanical parts, some of which would be cut out of wood. I just continued with this. Inkscape is commonly used to generate svg files that can be used in Freecad. I also use Blender to create bas-reliefs to do what I think you are talking about. Blendercam also generates surface milling g codes that Freecad has some difficulty with.

Not to get too long winded, I simply want to be able to draw something in Inkscape, some closed loop and some curved lines that are not connected beginning to end, export it as a svg, import it into something and generate a g code.

I should probably look to the Freecad community for the answer to this. I will definitely look into what CAD CAM capabilities are available from linuxcnc.

Thanks for all you help

Fixed.

I have recently had to return to 2.7.15 from 2.9.4.  (There is no easy way to upgrade from 2.7.15 to 2.8 which is required to get to 2.9.4.  Attempts to install from 2.9.4 ISO were unsucessful.  Even getting 2.7.15 to install from ISO was hard,) 

This all worked fine in 2.9.4.  In axis gui, I have homed all four axes.  Z=0.  When I use G1 Z1 f4, I get "Can't issue MDI command when not homed."  Can you tell me what I need to fix?