Marlin configuration issue..No axis moving in negative direction..

I have built core XY assembly for XY pen plotter with GT2 20T pulley and its belt and solenoid to make pen up and down. i am using RAMPS1.4 and marlin firmware with repetier host to manually control and to send gcode files.i am having issue with manual control.i have attached solenoid to D9 port of ramps1.4board.

Its possible to move machine in positive direction only..for example when i give +10 for X or Y from manual control..it moves in that direction..but when i give -10 or any negative value to any axis..it just doesn't move.why is it so?even when i load gcode file in repetier host and start print..solenoid goes down and RED LED glows on ramps board.is it any kind of indication?
Any problem in configuration file?

One more thing..
I haven't used endstos yet..will it create the problem?

There is a setting for allowing negative travel. It is in the configuration.h file.

I didnt find it..help me please

changing the X, Y, and Z_MAX_ENDSTOP_INVERTING settings worked fine

Edited 1 time(s). Last edit at 05/11/2015 06:31PM by 3machine.

Yes its your endstops. With them unpluged they are triggered, so it will not move negative.

ENDSTOP_INVERTING is a cludge to disable that behaviour, but will work.