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POLighting USB OpenDMX FTD2XX DMXking
 

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  1. POLighting USB OpenDMX FTD2XX DMXking
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    <p>Couple of quick questions. I have a DMX king USB lighting controller that I'm trying to control. </p> <p>It's based on the Open DMX protocol (from Entec) who make available a c# class. I've got the device plugged into an RGB can, and if I test the USB device with their driver, it connects to COM4 and when I switch their software into transmit mode, I can then set individual DMX channels.</p> <p>Using their OpenDMX class, with a few modifications (the core is the same, i've just added some extra error checking, I can locate the device, query it's information etc. When I open the device I get a handle. I can write to that device with FT_Write but no matter what I do, no lights actually come on.</p> <p>Here's a few relevant code snippets:</p> <pre><code>public static byte[] buffer; [DllImport("FTD2XX.dll")] public static extern FT_STATUS FT_Open(UInt32 uiPort, ref uint ftHandle); [DllImport("FTD2XX.dll")] public static extern FT_STATUS FT_Write(uint ftHandle, IntPtr lpBuffer, UInt32 dwBytesToRead, ref UInt32 lpdwBytesWritten); public static void writeData() { while (!done) { try { initOpenDMX(); status = FT_SetBreakOn(handle); status = FT_SetBreakOff(handle); bytesWritten = write(handle, buffer, buffer.Length); if (bytesWritten == 0) { break; } System.Threading.Thread.Sleep(25); } catch (Exception) { break; } } Connected = false; done = false; } </code></pre> <p>All the status come back as FT_Ok, and bytesWritten comes back as 512 (the number of channels on this USB controller)</p> <p>I keep thinking I've missed something like setting the device into a transmit mode or similar (it only has one DMX socket)</p> <pre><code>public static void initOpenDMX() { status = FT_ResetDevice(handle); status = FT_SetDivisor(handle, (char)12); // set baud rate status = FT_SetDataCharacteristics(handle, BITS_8, STOP_BITS_2, PARITY_NONE); status = FT_SetFlowControl(handle, (char)FLOW_NONE, 0, 0); status = FT_ClrRts(handle); status = FT_SetLatencyTimer(handle, (byte)40); status = FT_Purge(handle, PURGE_TX); status = FT_Purge(handle, PURGE_RX); } </code></pre> <p>I've also tried the Entec OpenDMX class without any modifications from me and it doesn't seem to do anything either. </p> <p>Just want to stress that their control software is working fine, so the light and controller are compatible. I think something is missing in the way I'm using FTD2xx. There's no errors coming through (everything is FT_OK) so this suggests the DLL is working - especially since I can query the device using the FT_ListDevices and FT_GetDeviceInfo methods.</p> <p>Any ideas?</p> <p>Gareth</p>
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