/* RS-485 structures *//* RS-485 support *//* Used with ioctl() TIOCSERSETRS485 */struct rs485_control {        unsigned short rts_on_send;        unsigned short rts_after_sent;        unsigned long delay_rts_before_send;        unsigned short enabled;};/* Used with ioctl() TIOCSERWRRS485 */struct rs485_write {        unsigned short outc_size;        unsigned char *outc;};