Dear all,   Wen I use the USB cable I can communicate with my hexa: no problem   When I use the XBee I have problems: - The user interface react very slow - the terminal shows crc fail: "NavLink Bad Paket (Crc Fail)" very often: several times a second.   I use 2.0.40 software XBee pro 50mW Sparkfun USB Adapter on Notebook side 57600 speed.   What can i do? What I have done wrong?   thank you!