I just got a heated bed for the gMax 2. I can get it to work from the control panel but cannot get Simplify3d to start it with the GCODE. I have set it up in Simplify3d the way the instructions say (see below). I have also add GCODE to my End Script to turn it off, just like the instructions say (see below). However, whenever I slice an STL and send it to the printer, it does not turn on the heated bed and I have to turn it on manually from the printer. Any ideas?