Please Mark in the Repetier Firmware configuration tool that you have to check the correct Baudrate
Hello, I had a hard time to figure out why I had no working communication between Repetier Host and Mega2560/Ramps 1.4
Turns out I had to set the Baud rate in Host to the correct value between board and host software. Can you please give a notification/warning in the configuration software so that future me does not make the same error?! :-)