Help please. Dip switches and mach 3 settings

[john swift]

going by your photo in post 35

without circuit details of your breakout board
I expect the opto isolated BOB NPN outputs will be connected
so they can output sinks more current to GND
than it can source current from the +5V supply via a pullup resistor

If I am correct
I would connect the BOB to the stepper drivers like this :-



the + step & +direction going to the +5V supply and
- step & - direction being connected to the BOB outputs



John