+ unsigned reader_type; // 0: auto, 1: 1Mbps, 2,3: slooow
+ char *port_name; // "COM9", "/dev/ttyUSB0", "" for auto selection
+ unsigned port_interface; // 0: auto, 1: serial, 2: ftdi
+ unsigned beep; // beep when a card is beeing read
+ unsigned run; // polling condition