Digital Dream UC300 User Manual page 23

After the MPG selection done,we will go to setup the the MPG at Mach3 Software.
Go to Mach 3 and Menu -> Config -> Ports & Pins -> Encoder/MPG's as following.
Then to active the MPG function, you can use the hand pulse, under the main page, click TAB to active
MPG panel, refer to the following Picture:
Digital Dream Mach3 Motion Controller Page -21 UC300 User's Manual