GW Instek GFG-3015 - Manual (Page 49)

GFG-3015 p.45
/*---------------- initial Data ---------------*/
for(i = 0; i<100;i++) command_line[i]=0;
for(i = 0; i<100;i++) Receive_Data[i]=0;
/*---------------- Create Comm_port -----------*/
hComm = InitCom(error_value);
/*---------------- Send *IDN? -----------------*/
dwcommand_len =sprintf( command_line,"*IDN?\n"); // ‘\n’ is message
// terminator
WriteFile(hComm,command_line,dwcommand_len,&dwWritten,NULL);
Sleep(1000); // delay 1 sec for instrument response
ReadFile(hComm,Receive_Data,100,&dwRead,NULL);
Receive_Data[strlen(Receive_Data)] = 0x00;
printf("\nReceive_Data = %s\n",Receive_Data);
/*-------------- Send FRQuency = 1000Hz -----------*/
dwcommand_len =sprintf( command_line,":FREQuency %3.0f\n",1000.0);
// ‘\n’ is message terminator
WriteFile(hComm,command_line,dwcommand_len,&dwWritten,NULL);
CloseHandle(hComm);
}
/*---------------------------------------------*/
/* Initial RS-232 */
/*---------------------------------------------*/
HANDLE InitCom(int Error_Value)
{
HANDLE hComm;
COMMTIMEOUTS CommTimeOuts;
hComm = CreateFile("COM1",
GENERIC_READ | GENERIC_WRITE, 0, NULL, OPEN_EXISTING,NULL, NULL );
if (hComm == INVALID_HANDLE_VALUE)
{
printf("%s",Error_Message[0]);
return FALSE;
}
/*----------------- Timeout -------------------*/
CommTimeOuts.ReadIntervalTimeout = 1;
CommTimeOuts.ReadTotalTimeoutMultiplier = 0;
CommTimeOuts.ReadTotalTimeoutConstant = 1000;
CommTimeOuts.WriteTotalTimeoutMultiplier = 0;
CommTimeOuts.WriteTotalTimeoutConstant = 5000;
if(!SetCommTimeouts(hComm, &CommTimeOuts ))
{
printf("%s",Error_Message[1]);
return FALSE;
}