SV03 won't communicated with pronterface

Had to reload Marling to my printer. 1) when it homes middle home position is about 10 mm from bed should it not be at print height?
2) will not communicate with pronterface fault says got rubbish reply from com3 at baudrate 115200, I tried to change the baud but same. Checked printer and baudrate is much higher. Need help bigtime as I need to do a big print