Hi,
Scott, thanks for helping out.
Mike, can you test that the output for the LED is working? You can do this by observing the corresponding SMT LED on the ModIO board. Does it illuminate?
If not, then you need to go to the Mach3 Modbus Test page and turn the Led on through there to test if it works.
As to the plugin, the latest one I have from Scott is Ver: 2-4
Send me your email and I'll send it to you.
Cheers,
Peter.