Re: HPR comunication protocol can be used from another source?
I'm not really familiar with the HPR260 but it sounds like it is designed to drop into a CNC controller with servo drives controlled by Ethercat which runs over ethernet. The real issue is that you need real time control and you won't get that out of an Arduino. HAve a look at the Bekhof sebsite for more info.
The only way you might get it hooked up is via LInuxCNC as it will support ethercat. However, it would be a long road becasue the Hypertherm protocol would need a custom driver to be written and that is generally beyond the average hobbiest or machine shop owner.
Rod Webster
www.vehiclemods.net.au