Ok I tried it in the same way as u explained but nothing happens, i moved the #100 to DM10, and also changed the PT configuration as D00010, but still it keeps showing System Initializing screen, can you please tell me about the cable pinouts that should be used between omron PLC and NT31, i am using this cable pinout, DB9 Male DB9 Male 2 ------------------------------ 2 3 ------------------------------ 3 8 ------------------------------ 4 7 ------------------------------ 5 5 ------------------------------ 9 i thought it might be the case that cable which i am using between plc and NT31 not correct, i am newbie on omron system so facing these issues, i will be very thankful to you please help me out.