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    <p>I ran Hippy's VB version through a mechanical VB to C# translator and found one key difference. FT_WRITE uses a string to pass data to the unmanaged code. The C# class uses an IPtr pointing to a byte array.</p> <p>This version works for me:</p> <pre><code>using System; using System.Runtime.InteropServices; using System.Threading; // based on Hippy's VB Example // http://members.westnet.com.au/rowanmac/opendmx.html#tx // Working link: https://web.archive.org/web/20150217155014/http://members.westnet.com.au:80/rowanmac/opendmx.html namespace Test { class Program { [DllImport("FTD2XX.DLL", CharSet = CharSet.Ansi, SetLastError = true, ExactSpelling = true)] private static extern int FT_Open(short intDeviceNumber, ref int lngHandle); [DllImport("FTD2XX.DLL", CharSet = CharSet.Ansi, SetLastError = true, ExactSpelling = true)] private static extern int FT_Close(int lngHandle); [DllImport("FTD2XX.DLL", CharSet = CharSet.Ansi, SetLastError = true, ExactSpelling = true)] private static extern int FT_SetDivisor(int lngHandle, int div); [DllImport("FTD2XX.DLL", CharSet = CharSet.Ansi, SetLastError = true, ExactSpelling = true)] private static extern int FT_Read(int lngHandle, string lpszBuffer, int lngBufferSize, ref int lngBytesReturned); [DllImport("FTD2XX.DLL", CharSet = CharSet.Ansi, SetLastError = true, ExactSpelling = true)] private static extern int FT_Write(int lngHandle, string lpszBuffer, int lngBufferSize, ref int lngBytesWritten); [DllImport("FTD2XX.DLL", CharSet = CharSet.Ansi, SetLastError = true, ExactSpelling = true)] private static extern int FT_Write(int lngHandle, IntPtr lpBuffer, int lngBufferSize, ref int lngBytesWritten); [DllImport("FTD2XX.DLL", CharSet = CharSet.Ansi, SetLastError = true, ExactSpelling = true)] private static extern int FT_SetBaudRate(int lngHandle, int lngBaudRate); [DllImport("FTD2XX.DLL", CharSet = CharSet.Ansi, SetLastError = true, ExactSpelling = true)] private static extern int FT_SetDataCharacteristics(int lngHandle, byte byWordLength, byte byStopBits, byte byParity); [DllImport("FTD2XX.DLL", CharSet = CharSet.Ansi, SetLastError = true, ExactSpelling = true)] private static extern int FT_SetFlowControl(int lngHandle, short intFlowControl, byte byXonChar, byte byXoffChar); [DllImport("FTD2XX.DLL", CharSet = CharSet.Ansi, SetLastError = true, ExactSpelling = true)] private static extern int FT_ResetDevice(int lngHandle); [DllImport("FTD2XX.DLL", CharSet = CharSet.Ansi, SetLastError = true, ExactSpelling = true)] private static extern int FT_SetDtr(int lngHandle); [DllImport("FTD2XX.DLL", CharSet = CharSet.Ansi, SetLastError = true, ExactSpelling = true)] private static extern int FT_ClrDtr(int lngHandle); [DllImport("FTD2XX.DLL", CharSet = CharSet.Ansi, SetLastError = true, ExactSpelling = true)] private static extern int FT_SetRts(int lngHandle); [DllImport("FTD2XX.DLL", CharSet = CharSet.Ansi, SetLastError = true, ExactSpelling = true)] private static extern int FT_ClrRts(int lngHandle); [DllImport("FTD2XX.DLL", CharSet = CharSet.Ansi, SetLastError = true, ExactSpelling = true)] private static extern int FT_GetModemStatus(int lngHandle, ref int lngModemStatus); [DllImport("FTD2XX.DLL", CharSet = CharSet.Ansi, SetLastError = true, ExactSpelling = true)] private static extern int FT_Purge(int lngHandle, int lngMask); [DllImport("FTD2XX.DLL", CharSet = CharSet.Ansi, SetLastError = true, ExactSpelling = true)] private static extern int FT_GetStatus(int lngHandle, ref int lngRxBytes, ref int lngTxBytes, ref int lngEventsDWord); [DllImport("FTD2XX.DLL", CharSet = CharSet.Ansi, SetLastError = true, ExactSpelling = true)] private static extern int FT_GetQueueStatus(int lngHandle, ref int lngRxBytes); [DllImport("FTD2XX.DLL", CharSet = CharSet.Ansi, SetLastError = true, ExactSpelling = true)] private static extern int FT_GetEventStatus(int lngHandle, ref int lngEventsDWord); [DllImport("FTD2XX.DLL", CharSet = CharSet.Ansi, SetLastError = true, ExactSpelling = true)] private static extern int FT_SetChars(int lngHandle, byte byEventChar, byte byEventCharEnabled, byte byErrorChar, byte byErrorCharEnabled); [DllImport("FTD2XX.DLL", CharSet = CharSet.Ansi, SetLastError = true, ExactSpelling = true)] private static extern int FT_SetTimeouts(int lngHandle, int lngReadTimeout, int lngWriteTimeout); [DllImport("FTD2XX.DLL", CharSet = CharSet.Ansi, SetLastError = true, ExactSpelling = true)] private static extern int FT_SetBreakOn(int lngHandle); [DllImport("FTD2XX.DLL", CharSet = CharSet.Ansi, SetLastError = true, ExactSpelling = true)] private static extern int FT_SetBreakOff(int lngHandle); // FTDI Constants const short FT_OK = 0; const short FT_INVALID_HANDLE = 1; const short FT_DEVICE_NOT_FOUND = 2; const short FT_DEVICE_NOT_OPENED = 3; const short FT_IO_ERROR = 4; const short FT_INSUFFICIENT_RESOURCES = 5; // Word Lengths const byte FT_BITS_8 = 8; // Stop Bits const byte FT_STOP_BITS_2 = 2; // Parity const byte FT_PARITY_NONE = 0; // Flow Control const byte FT_FLOW_NONE = 0x0; // Purge rx and tx buffers const byte FT_PURGE_RX = 1; const byte FT_PURGE_TX = 2; public static int handle=0; public static byte[] buffer = new byte[4]; // can be up to 512, shorter is faster private static string lpszBuffer=""+ (char) 0 + (char) 64 + (char) 64+ (char) 0; static void Main(string[] args) { init(); } public static string init() { short n = 0; // ==== ATTEMPT TO OPEN DEVICE ==== if (FT_Open(n, ref handle) != FT_OK) { return "FTTD Not Found"; } // ==== PREPARE DEVICE FOR DMX TRANSMISSION ==== // reset the device if (FT_ResetDevice(handle) != FT_OK) { return "Failed To Reset Device!"; } // get an ID from the widget from jumpers // GetID(ref n); // set the baud rate if (FT_SetDivisor(handle, 12) != FT_OK) { return "Failed To Set Baud Rate!"; } // shape the line if (FT_SetDataCharacteristics(handle, FT_BITS_8, FT_STOP_BITS_2, FT_PARITY_NONE) != FT_OK) { return "Failed To Set Data Characteristics!"; } // no flow control if (FT_SetFlowControl(handle, FT_FLOW_NONE, 0, 0) != FT_OK) { return "Failed to set flow control!"; } // set bus transiever to transmit enable if (FT_ClrRts(handle) != FT_OK) { return "Failed to set RS485 to send!"; } // Clear TX &amp; RX buffers if (FT_Purge(handle, FT_PURGE_TX) != FT_OK) { return "Failed to purge TX buffer!"; } // empty buffers if (FT_Purge(handle, FT_PURGE_RX) != FT_OK) { return "Failed to purge RX buffer!"; } setDmxValue(0, 0); // should always be zero setDmxValue(1, 64); setDmxValue(2, 64); setDmxValue(3, 0); Thread thread = new Thread(new ThreadStart(writeDataThread)); thread.Start(); return "Ok"; } // init public static void setDmxValue(int channel, byte value) { buffer[channel] = value; lpszBuffer=""; for (int i = 0; i &lt; buffer.Length; ++i) { lpszBuffer += (char)buffer[i]; } } public static void writeDataThread() { bool done = false; int lngBytesWritten=0; while (!done) { FT_SetBreakOn(handle); FT_SetBreakOff(handle); FT_Write(handle, lpszBuffer, buffer.Length, ref lngBytesWritten); System.Threading.Thread.Sleep(50); } } } </code></pre> <p>}</p>
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