Persistence (I mean many hours) pays off......at the Config, Plugin Configuration, Galil, Custom Notify tab I enabled an entry, entered a message ID of 3000 and entered a command of SP1234. Then with the screen editor, I entered a VB script for a button press with the entry NotifyPlugins(3000).
The button press changes the speed for the x axis to 1234 counts/sec which I verify with Galil DMC SmartTerminal.
Cheers,
waverly