This program do the round robin test of STEP-200 
command and check the correctness.               

    STEP-200     --|->    ENCODER-300
  output pulse     |      monitor pulse
    
 1. 500 cycles MSTEP2_INTP_LINE02   
 2. 500 cycles MSTEP2_INTP_ARC02 
 3. 500 cycles MSTEP2_INTP_CIRCLE02