Breakout Board expandability...CNCdrive based control system

[Neale]

I suspect that you have not quite understood the way the set of 5 ports works on the UC300/400. You can plug a BOB into port 1, and that gives you access to the various I/O pins 1-25. You can plug a second BOB into port 2, and that gives you access to I/O pins 1-25 - but this time they are labelled Port 2/Pin 1, for example. Similarly, you can plug BOBs into ports 3-5 for additional I/O. Port 1/pin 1, Port 2 pin 1, Port 3/pin 1, etc, are all different connections and that is how you get access to the enormous number of I/O pins. You don't need to reuse the step/dir pins. I know that the UC300ETH manual is slightly ambiguous about the analogue port, but if you look at the UC300USB manual which has the same output port configuration, the description is better. It might be worth reading both manuals for descriptions of the digital I/O ports and pins as well but I haven't read those parts of the manuals myself. I'm sure that the ETH manual version will be corrected in a later version.