Move sleep for serial before the flush

src/serial.c

@@ -255,8 +255,8 @@ int HAMLIB_API serial_open(hamlib_port_t *rp)
         return (err);
     }
 
-    serial_flush(rp); // ensure nothing is there when we open
     hl_usleep(50 * 1000); // give a little time for MicroKeyer to finish
+    serial_flush(rp); // ensure nothing is there when we open
 
     return (RIG_OK);
 }