Hi Jay,

Thanks for your fast reply! I've actually had a bit of a breakthrough... I think a combination of things were holding me back, but the noticeable one was to do with the monitoring section of the plugin configuration screen. The author of the page you provided the link to suggested that you could monitor a certain status from the vfd, have it displayed in a dro and set and estop threshold of a given unit. Following his advice I set a value for the estop threshold for one of the drop down options and forgot about it, it wasn't until I checked every single option that I found my mistake.

The vfd now tries to run without the spindle connected. However, when I did connect the spindle the vfd throws a fault of open connection and forces an estop condition, which is actually damn clever :) I think perhaps a connection has come loose on the crappy chinese spindle plug / socket. More investigation is required, but I'm chuffed that the plugin is working enough for me to get this far. Hopefully it'll play ball when I put it through more testing soon

Thanks for your help!