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VEE's WRITE BINBLOCK in c

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

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Hi All,
I don't know is this forum correct for my question, sorry for taking time but I need help for the following question:

I have been trying to download IQ data to E4438C over LAN using C#. If I use vee(There is an example in vee's example folder) and MATLAB, download is OK, but when I try to download using c# download is not successful. 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?
Here is my C# Code

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);

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

Regards
Cengiz EKEN

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changmeikuan Aug 24, 2010 12:04 AM

Hi,

For your "write(":MMEM:DATA...." I am not sure what is the library you used to write to the instrument. If I am not mistaken you are trying to write a binblock to an instrument. If so, my experience was using VISA-C to write a binblock to an instrument, using viWrite. I guess VISA-COM provide similar method which probably is IFormattedIO488.WriteIEEEBlock. For more information on VISA-C/COM programming using C#, you may refer to help file in Agilent IO Libraries Suite > Help. If you are using the method mentioned, be careful when dealing with Int16 data, LSB/MSB and etc.

Hope this helps

-mk

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ceken Aug 24, 2010 12:42 AM

Hi,
Thank you for your response. Yes I am trying to write binblock, but not using VISA. I use standart .NET socket library to establish a communication over TCP/IP as follows:

Socket socket;
socket= new Socket(AddressFamily.InterNetwork, SocketType.Stream, ProtocolType.Tcp);
socket.Connect(this.Ip);
//my write method
private void write(string command)
        {
            socket.Send(Encoding.ASCII.GetBytes(command));//socket.Send accepts byte[] argument
        }

Regards

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changmeikuan Aug 24, 2010 12:53 AM

I have not tried "standard .NET socket library to establish a communication over TCP/IP" before, can't help much

If you are out of hope, try to use VISA-C/COM, or if your instrument provide IVI driver. :wink:

-mk

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ceken Aug 24, 2010 1:53 AM

Hi mk,
In IEEE488.2 binary block data transfers, there is an ASCII header followed by the binary data payload. To realize this, first ascii header(withot EOL,this is important) is sent and then byte[] part. There is no compound sending case(byte[] and string together)
In the end after carefully tracing my code, 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 write(string command)
        {
            Soket.Send(Encoding.ASCII.GetBytes(command));
        }

        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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changmeikuan Aug 24, 2010 2:04 AM

Cool. Thanks for the sharing 8)

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changmeikuan Aug 24, 2010 12:04 AM
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Hi,

For your "write(":MMEM:DATA...." I am not sure what is the library you used to write to the instrument. If I am not mistaken you are trying to write a binblock to an instrument. If so, my experience was using VISA-C to write a binblock to an instrument, using viWrite. I guess VISA-COM provide similar method which probably is IFormattedIO488.WriteIEEEBlock. For more information on VISA-C/COM programming using C#, you may refer to help file in Agilent IO Libraries Suite > Help. If you are using the method mentioned, be careful when dealing with Int16 data, LSB/MSB and etc.

Hope this helps

-mk
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ceken Aug 24, 2010 12:42 AM
Mark Correct
Correct Answer
Hi,
Thank you for your response. Yes I am trying to write binblock, but not using VISA. I use standart .NET socket library to establish a communication over TCP/IP as follows:

Socket socket;
socket= new Socket(AddressFamily.InterNetwork, SocketType.Stream, ProtocolType.Tcp);
socket.Connect(this.Ip);
//my write method
private void write(string command)
        {
            socket.Send(Encoding.ASCII.GetBytes(command));//socket.Send accepts byte[] argument
        }

Regards
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changmeikuan Aug 24, 2010 12:53 AM
Mark Correct
Correct Answer
I have not tried "standard .NET socket library to establish a communication over TCP/IP" before, can't help much
If you are out of hope, try to use VISA-C/COM, or if your instrument provide IVI driver.

-mk
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ceken Aug 24, 2010 1:53 AM
Mark Correct
Correct Answer
Hi mk,
In IEEE488.2 binary block data transfers, there is an ASCII header followed by the binary data payload. To realize this, first ascii header(withot EOL,this is important) is sent and then byte[] part. There is no compound sending case(byte[] and string together)
In the end after carefully tracing my code, 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 write(string command)
        {
            Soket.Send(Encoding.ASCII.GetBytes(command));
        }

        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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changmeikuan Aug 24, 2010 2:04 AM
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Cool. Thanks for the sharing 8)
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VEE's WRITE BINBLOCK in c

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