Reply To: Cannot connect to Ramps/Arduino Mac/Linux/Windows

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I had to do two things on my Mac to let Repetier control my Ramps:

Install the driver found here:


Next, using the Arduino IDE to edit the configuration.h file, search for #define BAUDRATE (cmd+F)

Set the communication speed in baud to:

#define BAUDRATE 115200

You can keep the other speed in comments, just remember this: //#define BAUDRATE 250000