This is my first post so I am hopeful for some help. I just encountered a problem with Mach 3 interface with my Precision Matthews PM 30 mill. When I highlight the S DRO and type in any speed, the numbers appear in the DRO box but as soon as I hit the "enter" key the number changes to a -1 value. I haven't intentionally changed any configuration settings. Any help would be appreciated.

Thanks

GMcG