ESP301

Hello All, 

I am using ESP301 for control of 2 pairs linear drives in XY Assembly to move a thin wire through a beam pipe. I have the ESP301 connected through USB. The motion and position control VIs when run, don't move the linear drives. Motion control example Vi that was downloaded from Newport's website, can control the linear drive but randomly i.e. the same Vi gives an error in the property node of the write and read command Vi. when the read Visa is fed with some bytes to be read, it most of the time, generates an error. Could someone please provide some guidance.

Thanks in Advance