Hi Rexdc,
if you want the plugin to fill your DRO, you must get the index of the DRO, (analyse your screenset). For exemple, if your AMPS dro is 1003, then go to the configuration screen of the plugin, select 'Current' in combo box then enter 1003 on the textArea below (check on my site to a better explaination). Do not forget to validate.
Then, the plugin will try to read currentValue from the VFD and displayit in your DRO.