Hi Anatoliy,
Your suggestions helped a lot. I was able to open the port and communicate with the serial device. Now I am struggling to get (verify) the serial number.

Thanks,
Yiorgos



>Hi Yiorgos.
>
>You did not indicate what members this structure consists of.
>Let, for example, define it as follows:

>typedef struct _STRUCTDEV {
>  DWORD iType;
>  WORD wPort;
>  CHAR strSerialNo[11];
>} STRUCTDEV;

>An equivalent FoxPro code should be something like this:

>#DEFINE SDTYPE_SERIAL 0x0001
>
>DECLARE INTEGER FSL_SelectDevice IN <dll name>;
>	STRING @dev, STRING param2
>
>LOCAL cBuffer, nType, nPort, cSerial
>nType = SDTYPE_SERIAL
>nPort = 1
>cSerial = "ABC02000001"
>
>cBuffer = PADR(Chr(nType), 4, Chr(0)) +;
>	PADR(Chr(nPort), 2, Chr(0)) +;
>	cSerial
>
>nResult = FSL_SelectDevice(@cBuffer, "any string")
>

>If the structure has different definition than you have to make corresponding changes in the way you populate cBuffer.