I'm trying to set up auto bed leveling on my prusa i2,

I’m trying to set up auto bed leveling on my prusa i2, and am following the guide included with Marlin, whenever I send the M114 to see the coordinates of the probe I get no response in the Pronterface terminal.
I’m not sure what I’m doing wrong here, any insight?

@Ashley_j what info do you need?

M114 is the command that displays how much the printer has moved from the origin in the three Cartesian planes.

I solved the problem though, in my case it was Pronterface not communicating properly over the serial connection. I switched to Repetier host and everything works now.