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No, the driver will not allow that unless you disable the encoder function
and the encoder pins are always inputs on a 7I96s (hardware determined)

As the topic is quite changed from the original question it felt better to start a new topic with the new approach:
forum.linuxcnc.org/12-milling/55747-how-to-build-a-cnc-mill

As my somewhat naive start into the topic in this thread:
forum.linuxcnc.org/12-milling/55699-any-...th-cnc-step-machines?
has mostly changed into another direction, I open a new one.
The goal is to end up with a machine able to work mostly flat wooden material mostly up to 27mm thickness with a working area of about 1500x1000mm. (Most likely by buying a made ready chassis and fit it with the desired motors, drvers, controller, spindel/router)
As it is -as several members mentioned in the other thread- kinda unwise to dump a few 1000 bugs directly. I decided to take a less costly path first. As I would love to have some use other than learning I'm thinking of this approach:
-getting a small, used desktop sized 3-axis mill chassis (around 200x200mm) with steppers and start from there
-purpose would be something like prototype PCB milling, some small wood pendant engraving
After I have that running turn to the larger machine, with the lessons learned from the mall one.

Well it's whatever the last debug usage was...

rodw wrote:

I was thinking along Tommys Lines. 

Me, too. Will start a new thread for that path.

Mesa 7i96s from EU Surplus
Meanwell MDR-20-5 power supply (5 volt logic power)
Meanwell MDR-60-24 power supply (24 volt field power)
Meanwell LRS-350-48 power supply (48 volt 7.3 amp motor power
3 x 50 volt stepper controllers
Estop button

I do understand the 5v logic and the motor power, but what does the "field power" do/ is for