the DZ board is for colour correction not breakout. DZ sold the design he developed with Bill Benner to me & I revamped it.
I have just revamped again but not quite for sale yet - 3 channel DZ colour correct and solid state axis control on one board.
@santai - it is possible to do stop over ethernet - I have used this in larger gigs having a PC stageside with a single cat5 run to control the pc using RDC as I was using FB3 controllers. The Estop was broken out of the CAT5 but then you need to make it do something once it breaks out. There are a few issues doing it this way but it is possible
Jim one of the reasons my system is very reliable is its very simple no data just a signal to pull the chip out of reset. Its rock solid and sometimes you can over complicate things. Im sure what you are saying would be possible maybe using CAN
Rob