extern int mctype;
extern int devdrv;

chkcd()		/* RS232C CD線 検出 */
   {

		unsigned status,serial,mask;
		RSB_status(devdrv,&status,&serial);
			if ( mctype ) mask = 0x0004;   /* FMR series  */
				else	  mask = 0x8000;   /* FM16Beta series  */
			if ( mask == ( status & mask ) ) return(1);
						/* ON なら1 */

	return(0);	/* OFF なら 0*/
   }