FAQ RHAA009(Driver Name): (Port Name) Cannot use the port. Error Details The error message [RHAA009(Driver Name): (Port Name) Cannot use the port] appeared on the GP3000 screen. Causes Two or more driver types may have been selected to an identical COM port. Actions Check the Port settings in the GP-Pro EX's Device/PLC settings. → How to change the COM port in GP-Pro EX

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