Hi Brian
![Cool 8)](https://www.machsupport.com/forum/Smileys/default/cool.gif)
Thanks for the reply well it sounds just the sort of thing i need, as i originally wanted to have one small interface cable running from the PC to the controller, as I am using MACH3 as an interface on the pc it sort of made sence to have an option in MACH3 where a serial IO could be used, afterall most of the professional cnc controllers are using it, but these are most probably migrating to usb.
so what do i want, well all of the most obvious things limits, step direction spindel control, you know what ever i can get realy
![Undecided :-\](https://www.machsupport.com/forum/Smileys/default/undecided.gif)
roger