One step closer, today my PCB's turned up for the encoder line drivers and also my breakout board I designed to plug into the MESA 7i43, kept everything simple, hopefully my servo drives will plug directly into this (and work) as well as basic IO, each board has step/dir/enable/index and fault signals to the four axis headers, as well as four outputs and seven inputs. General IO is opto isolated, servo drive signals are buffered as I have optos on the drives.