For the Graphtec CE 6000 and FC8600, you can change the communication language between HPGL, and GPGL. If your cutter is cutting random numbers, then you will need to press the PAUSE/MENU button on control panel. Then press the up arrow to choose I/F. Next select the COMMAND option.Here you can choose GPGL to communicate with your cutting software. Finally press ENTER and then the PAUSE/MENU again.