#define Txbuf	  0x00	   /* tx buffer */
#define Rxbuf	  0x00	   /* rx buffer */
#define Dll	  0x00	   /* baud lsb */
#define Dlh	  0x01	   /* baud msb */
#define Ier	  0x01	   /* int enable reg */
#define Fcr	  0x02	   /* FIFO control register */
#define Iir       0x02     /* Interrupt Identification Register */
#define Lcr	  0x03	   /* line control reg */
#define Dfr	  0x03	   /* Data format  reg */
#define Mcr	  0x04	   /* modem control reg */
#define Lsr	  0x05	   /* line status reg */

#define NoError         0
#define PortError      -1
#define DataError      -2
#define ParityError    -3
#define StopError      -4
#define TimeOut        -5
#define QueueEmpty     -6
#define QueueOverflow  -7
#define BaudRateError  -8
#define CheckSumError  -9

int InstallCom(int iPort, unsigned long lBaudRate,int iData,int iParity,int iStop);
int RestoreCom(int iPort);
int IsCom(int iPort);
int ToCom(int iPort, char data);
int ReadCom(int iPort);
int ClearCom(int iPort);
int SEND_CMD(int iPort, char *cCmd, long int lTimeout, int iChksum);
int RECEIVE_CMD(int iPort, char *cCmd, long int lTimeout, int iChksum);