char*	checkerror(int error_num);
long int Read_ARB_USB(HANDLE hCom,unsigned long arb_addr,int *data);
void Write_ARB_USB(HANDLE hCom,unsigned long int arb_addr,
		unsigned int arb_data);

int open_usb_port(const char* name);
void close_usb_port(HANDLE hCom);