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Modern laptops lack physical DB9 serial COM ports. If you are using a USB-to-RS232 adapter alongside a SC-09 cable, ensure the adapter uses a high-quality chipset (such as or Prolific PL2303 ). Cheap clones frequently fail to handle the precise timing required by DOS-based software.

To connect to a physical PLC, you must map your computer's USB-to-Serial adapter to a virtual COM port inside DOSBox. melsec medoc 2.4 download