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E4438C Waveform Download using C

Question asked by ceken on Aug 23, 2010
Latest reply on Aug 24, 2010 by ceken

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Hi All,
I have been trying to download IQ data to E4438C over LAN but I got "-103, Invalid Seperator" Eror. I could not locate the soruce of error in my code. Any help would be appreciated. I attached my code.
Regards
Cengiz EKEN

StreamWriter sr = new StreamWriter(Directory.GetCurrentDirectory() + "/IQData.txt");
            const int NUMSAMPLES = 500;
            byte[] iqBuffer = new byte[NUMSAMPLES * 4];
            short[] idata = new short[NUMSAMPLES];
            short[] qdata = new short[NUMSAMPLES];
            short ivalue;
            short qvalue;

            int numsamples = NUMSAMPLES;
            for (int index = 0; index < numsamples; index++)
            {
                idata[index] = (short)(23000 * Math.Sin((2 * 3.14 * index) / numsamples));
                qdata[index] = (short)(23000 * Math.Cos((2 * 3.14 * index) / numsamples));
            }

            for (int index = 0; index < numsamples; index++)
            {
                sr.Write(idata[index] + " ");
                sr.WriteLine(qdata[index]);
                sr.Flush();
            }
            sr.Close();

            for (int index = 0; index < numsamples; index++)
            {
                ivalue = idata[index];
                qvalue = qdata[index];
                iqBuffer[index * 4] = (byte)((ivalue >> 8) & 0xFF);
                iqBuffer[index * 4 + 1] = (byte)(ivalue & 0xFF);
                iqBuffer[index * 4 + 2] = (byte)((qvalue >> 8) & 0xFF);
                iqBuffer[index * 4 + 3] = (byte)(qvalue & 0xFF);
            }

           String iqBufferStr = System.Text.Encoding.UTF8.GetString(iqBuffer);

            writeLine(":MEM:DATA:UNPR \'WFM1:myDataDosya\' #" + iqBuffer.Length.ToString().Length + iqBuffer.Length + " " + iqBufferStr);

PS:I got this example E4400-90627.pdf "Agilent Technologies Signal Generators Creating And Downloading Waveform Files for c++ and converted to c#

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ceken Aug 23, 2010 11:34 PM

Hi All,
I Have found why "-103,Invalid seperator" occurs. The instrument command line should be

write(":MMEM:DATA \"WFM1:myDataDosya\",#" + iqData.Length.ToString().Length + iqData.Length + g);

I forgot the ",".But now another problem. I think I could not send the I/Q data. Because, although there is a data download UI on Signal Generator, Progress Bar remains at %0 and some time later it disappears without completing the download.
I think I have to implement MATLAB's "binblockwrite(...)" or VEE's "WRITE BINBLOCK Int16" command in C#. Is anyone out there who did that before?
Any Help?
Regards
Cengiz EKEN

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ceken Aug 24, 2010 1:47 AM

Hi all,
I found a solution. Here is how;
Instead of sending I/Q data as string(write(":MMEM:DATA \"WFM1:myDataDosya\",#" + iqData.Length.ToString().Length + iqData.Length + g); where g is the ASCII representation of IQArray formatted using Encoding.ASCII.GetBytes(...))
I sent it directly over TCIP/IP using socket.send(iqData) as byte[] and it is OK now. The final code is;

writeLine(":SOURce:RADio:ARB:STATE OFF");
Thread.Sleep(200);
write(":MMEM:DATA \"WFM1:myDataFile\",#" + iqData.Length.ToString().Length + iqData.Length);
writeLine(iqData);

        private void writeLine(string command)
        {
            Soket.Send(Encoding.ASCII.GetBytes(command+ EOLSequence));
        }

        private void writeLine(byte[] data)
        {
            Soket.Send(data);
            Soket.Send(Encoding.ASCII.GetBytes(EOLSequence));
        }

Hope Someone use it
Regards
Cengiz EKEN
www.marka-turk.com

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2 Replies

ceken Aug 23, 2010 11:34 PM
Mark Correct
Correct Answer
Hi All,
I Have found why "-103,Invalid seperator" occurs. The instrument command line should be
write(":MMEM:DATA \"WFM1:myDataDosya\",#" + iqData.Length.ToString().Length + iqData.Length + g);
I forgot the ",".But now another problem. I think I could not send the I/Q data. Because, although there is a data download UI on Signal Generator, Progress Bar remains at %0 and some time later it disappears without completing the download.
I think I have to implement MATLAB's "binblockwrite(...)" or VEE's "WRITE BINBLOCK Int16" command in C#. Is anyone out there who did that before?
Any Help?
Regards
Cengiz EKEN
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ceken Aug 24, 2010 1:47 AM
Mark Correct
Correct Answer
Hi all,
I found a solution. Here is how;
Instead of sending I/Q data as string(write(":MMEM:DATA \"WFM1:myDataDosya\",#" + iqData.Length.ToString().Length + iqData.Length + g); where g is the ASCII representation of IQArray formatted using Encoding.ASCII.GetBytes(...))
I sent it directly over TCIP/IP using socket.send(iqData) as byte[] and it is OK now. The final code is;

writeLine(":SOURce:RADio:ARB:STATE OFF");
Thread.Sleep(200);
write(":MMEM:DATA \"WFM1:myDataFile\",#" + iqData.Length.ToString().Length + iqData.Length);
writeLine(iqData);

        private void writeLine(string command)
        {
            Soket.Send(Encoding.ASCII.GetBytes(command+ EOLSequence));
        }

        private void writeLine(byte[] data)
        {
            Soket.Send(data);
            Soket.Send(Encoding.ASCII.GetBytes(EOLSequence));
        }

Hope Someone use it
Regards
Cengiz EKEN
www.marka-turk.com
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E4438C Waveform Download using C

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