Some problem with code

Hello , I recently build kossel mini (delta).
And the board is Ramp1.4.
But there are some problems :
We sent code "G28" 'G29' , and it can work ;However we sent "G1'' or other codes , it can't move.
Ls this Marlin's problem? Or?

This is the Marlin : [www.dropbox.com]

Please somebody give me advise

Thx a lot ~~~~

Well, G29 is home, so it looks like you have all axes moving right and endstops work.

Maybe it is because you home to maximum, and you are trying to move beyond that with G1 commands? Homing positions are a little odd on a Delta.

It helps a lot to have an LCD and encoder fitted, when getting a printer going. I noticed you had not enabled those features.