I think palawanisland is correct; it depends on what GCode flavour you're using.

I'm using Slic3r at the moment and that has an option (Printer Setting > Firmware) to select the correct flavour. If you're using Sailfish set it to "Sailfish (Makerbot)". My guess for the default firmware would be "Makerware (Makerbot)".

You can look up RepRap flavoured GCodes here http://reprap.org/wiki/G-code. E.g. the M190 command is to "wait for bed temperature to reach target temp". I think this is the equivalent Sailfish command "M6 T0; wait for bed and extruder to heat up", but I'm not sure about the rest.