- install USB to COM driver (see qfix installation)
- check is system manager if COM4 is available
- set baud rate to 19200 

- upload program to robot
- start robot

- open project: serial_port.sln
- test program (test_serial_port.cpp) opens serial port, sends characters
- BUG: you have to enter each character twice
     1 (enter): forward  
     2 (enter): backward  
     3 (enter): left
     4 (enter): right
     5 (enter): stop motors  
     CRTL+C   : stop program