Tango Server for controlling the motors connected to the C867 controller from PI. The Server uses two classes: PiezoPiC867Motor and PiezoPiC867Ctrl. The first one gives the name to the server and imports the class PiezoPiC867Ctrl . The controller is connected to the computer using an usb to rs232 adapter. The class PiezoPiC867Ctrl talks to the serial device. The class PiezoPiC867Motor talks to the first one.