I have brought sc09 cable.sc09 cable's 8pin connector connect to PLC and other portion I connect to RS232 converter's com port.And RS232 cable's USB connect to PC.After that,PC found the hardware or cable.But when I open Melsec GX developer and try to upload or read the file from PLC it shows error. Error is "an unauthorized port". Can anyone help me out to find the solution??