Communicate with a FT232R device RRS feed

  • Question

  • I have installed the VCP driver for Windows 7 from here: http://www.ftdichip.com/Drivers/VCP.htmNow I want to communucate with the device so here is the code :

    FT_STATUS ftStatus;
    FT_HANDLE ftHandle;
    char Buf[64];
    // the device found is **FT232R USB UART**
    ftStatus = FT_ListDevices(0, Buf, FT_LIST_BY_INDEX | FT_OPEN_BY_DESCRIPTION); 
    ftHandle = FT_W32_CreateFile(Buf, GENERIC_READ | GENERIC_WRITE, 0, 0,
    if (ftHandle == INVALID_HANDLE_VALUE) {
    const char* cmd = "command"
    bool res = FT_W32_WriteFile(ftHandle, (LPVOID)cmd, strlen(cmd), &bytes_written, NULL);
    if (bytes_written != strlen(cmd)) {

    I can found the device and there is no error in CreateFile or WriteFile but when I send the command the device doesn't react(nothing happens). I created a Win32 Console application in Visual Studio Community 2015 in C++, so that is why I use FT_W32... Should I also open the serial port using CreateFile ?What am I missing or doing wrong ?


    Monday, August 22, 2016 12:15 PM


All replies

  • Wrong forum, this is not related to the VS debugger or other tools.

    To test a serial device, connect something to the other side of the cable that can display the sent data. Maybe, another computer with a cross cable.

    Sometimes, adding CR or LF character after the command may help.


    -- pa

    • Edited by Pavel A Monday, August 22, 2016 1:53 PM
    Monday, August 22, 2016 1:51 PM
  • Hello,

    I'd ask the driver developer.


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    Tuesday, August 30, 2016 8:42 PM
  • or try them over here.




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    • Proposed as answer by Just Karl Tuesday, August 30, 2016 11:06 PM
    • Marked as answer by Just Karl Thursday, September 8, 2016 7:06 PM
    Tuesday, August 30, 2016 9:51 PM