//char asc2hex(char ch1, char ch2);
int Aschex_2_bcdhex(unsigned char aschex[], int len, unsigned char bcdhex[]);
char Hexlow2asc(int xxc);
char Hexhigh2asc(int xxc);
int Bcdhex_2_aschex(unsigned char bcdhex[], int len, unsigned char aschex[]);
void printfHEX(unsigned char* strbuf, int length);