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How do I use GPIB in Visual C++ for E4438C Signal Generator

Question asked by jmcguidwin on Nov 16, 2007
Latest reply on Nov 20, 2007 by jmcguidwin

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I am new to the GPIB communication and I would like to know how do i set up a new instance to communicate with the device to set parameters.

I need to set frequency, amplitude, pulse, noise etc...

my E4438C id is 19.

both do not work and i am not sure why.
send(19,"*IDN?", 5, 1);
ibwrt(0, "*IDN?", 5);

below is one error i get durring linking and i also got a heap memery error during runtime:
error LNK2028: unresolved token (0A00001A) "extern "C" int __stdcall send(unsigned int,char const *,int,int)" (?send@@$$J216YGHIPBDHH@Z) referenced in function "public: bool __clrcall CJammer::runCommand(void)" (?runCommand@CJammer@@$$FQ$AAM_NXZ)

I do include the decl-32.h and gpib-32.obj in my project.

does anyone have some sample code for your E4438C in Visual C++ that I can reference.

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JohnMiles Nov 19, 2007 12:54 AM

You might try the TALK.CPP and QUERY.CPP console examples in my freeware GPIB package at http://www.ke5fx.com/gpib/readme.htm -- they are not specific to any particular instrument. Try query 19 "*IDN?" at the command prompt and see if you get the expected response. If that works, you can trace into the source to understand what it's doing compared to your own code.

These utilities use a simplified 'wrapper' library that abstracts the differences between National Instruments and Prologix boards. They will work with either.

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jmcguidwin May 11, 2016 3:23 AM

I use a different GPIB interface that semse to work.

I used NationalInstruments::NI4882.dll to create a new Device
below is an example.

#include "windows.h"          // WINDOWS.H contains definitions used by NI488.H
#include "ni488.h"            //NI488.H contains prototypes for the GPIB routines and constants.
using namespace System;                        //used for String^
using namespace NationalInstruments::NI4882;    //GPIB device interaction

void myClass::runCommand()
{
NationalInstruments::NI4882::Device NIdevice((int)0,(byte)19,(byte)0); //Create a new NI4882 Device
//NIdevice.ReaddressingEnabled;
String^ gpib_data = "*idn?\n";
NIdevice.Write(this->ReplaceCommonEscapeSequences(gpib_data));                  // Query the signal generator
String^ gpib_read = this->InsertCommonEscapeSequences(NIdevice.ReadString()); // Read the response
}

I also have another post at Discussion Forums

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JohnMiles Nov 19, 2007 12:54 AM
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You might try the TALK.CPP and QUERY.CPP console examples in my freeware GPIB package at http://www.ke5fx.com/gpib/readme.htm -- they are not specific to any particular instrument. Try query 19 "*IDN?" at the command prompt and see if you get the expected response. If that works, you can trace into the source to understand what it's doing compared to your own code.

These utilities use a simplified 'wrapper' library that abstracts the differences between National Instruments and Prologix boards. They will work with either.
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jmcguidwin May 11, 2016 3:23 AM
Mark Correct
Correct Answer
I use a different GPIB interface that semse to work.

I used NationalInstruments::NI4882.dll to create a new Device
below is an example.

#include "windows.h"          // WINDOWS.H contains definitions used by NI488.H
#include "ni488.h"            //NI488.H contains prototypes for the GPIB routines and constants.
using namespace System;                        //used for String^
using namespace NationalInstruments::NI4882;    //GPIB device interaction

void myClass::runCommand()
{
NationalInstruments::NI4882::Device NIdevice((int)0,(byte)19,(byte)0); //Create a new NI4882 Device
//NIdevice.ReaddressingEnabled;
String^ gpib_data = "*idn?\n";
NIdevice.Write(this->ReplaceCommonEscapeSequences(gpib_data));                  // Query the signal generator
String^ gpib_read = this->InsertCommonEscapeSequences(NIdevice.ReadString()); // Read the response
}

I also have another post at Discussion Forums
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How do I use GPIB in Visual C++ for E4438C Signal Generator

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