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I have used PLC HIMA and software ELOP run under DOS, communication via serial port. Now, I want to replace computer that contain old DOS and ELOP software to new computer contain WINDOWS XP then I install ELOP software and run by CMD. I have install USB to serial port adapter also. I can run ELOP software and establish communication in only a few seconds then error 'communication line break' occurred. When I try to make a connection again, I can connect in a few seconds and got the same error again. What's happening? How can I solve this problem?