int main()
{
char buf[2000];
DWORD dwBytesWritten;
DWORD bytesread;
int rc;
char ch;

system("cls");

printf("\n\n");

system("mode com420: baud=4800 parity=N data=8 to=off xon=off octs=off dtr=off rts=off idsr=off");

h = CreateFile("COM420", GENERIC_READ | GENERIC_WRITE,0, 0, OPEN_EXISTING, 1, 0);

printf("serial.port=%d\n",h);

mt4();
}//main