-#define READER_TYPE 1 //uFR type (1Mbps)
-#define PORT_NAME "/dev/ttyUSB0"
-#define PORT_INTERFACE 1 //Serial
+#define READER_TYPE 1 //uFR type (1Mbps)
+#ifndef PORT_NAME
+#define PORT_NAME "/dev/ttyUSB0" //"" for auto
+#endif
+#define PORT_INTERFACE 1 //Serial