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i begin again and i use your original soft and hardware.
in ramp 1.4 axi X is the uper motor, axi Y the other motor that move arms..
endstop conector.
1.- free
2.- concted, 3 cables end stop as your endstop.
i conect the nearest endstop to the motors
3.- free
4.-the far endstop of the arm
5.- Z end stop
6.- free
Using pronterface.
i push homing boton only do Z axis homming, the other axis not move
in lateral console "SCARA Theta:83.21 Psi+Theta:218.29"
movin axis with pronterface
Z+ go up, but not let me go down

SENDING:M119
Reporting endstop status
x_max: open
y_max: open
z_min: open

this is the status of end stop, when no one are activated
when i push it manualy
SENDING:M119
Reporting endstop status
x_max: TRIGGERED
y_max: TRIGGERED
z_min: TRIGGERED

thaks by your help