double Zmin = -100; //Max.Z depth
double Feedrate = 250; //Feedrate for probing 
double retractheight = 5; //The retract height 
double newZ = 39.3; //The new Z DRO value after probing

exec.Code("G31 Z" + Zmin + "F" + Feedrate); // Start probing 

while(exec.IsMoving()){} // Wait while there is motion 

exec.Wait(200);  //Safety wait for the UC100 syncronisation 


exec.ChangeaxisDROvalue(2, newZ.ToString()); //Change the DRO value 
exec.Wait(200);  //Safety wait for the UC100 syncronisation

if(!exec.Ismacrostopped()) // If tool change was not interrupted with a stop only then validate new tool number 
{ double Zup = exec.GetZmachpos() + retractheight; //Calculate the new coordinate for the retract of Z axis
exec.Code("G00 G53 Z" + Zup); //Retract the Z-axis 
while(exec.IsMoving()){} // Wait while there is motion 
}