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Agilent 34410A Mulitmeter Matlab Library Error

Question asked by oktoberfestMUC on Aug 4, 2011
Latest reply on Aug 11, 2011 by hognala

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hey guys,

so I am having some trouble with the device connection in matlab with the 34410a library of the digital multimeter. I am using the Instrument Control Toolbox and the interface object was created properly with visa and it appears when I use the tmtool function.The library is listed under the Matlab instrument drivers and it is already an .mdd file.
when I try to create a device object with vu being already an interface object to the instrument:

d = icdevice('Ag34410.mdd', 'vu')
I get the error:
??? Error using ==> icdevice.icdevice>icdevice.icdevice at 241
The VXIplug&play driver referenced in C:

I have been able to make a low level connection using fopen(vu) of the interface object and send the *IDN? query which had a response...but i still cant create this device object. I guess its maybe a problem with the library conversion to .mdd?

I also want to know that If i do create this device object, will I be able to use agilent library functions in Matlab normally and not just the low level SCPI commands?

Thanks for your help!

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oktoberfestMUC Aug 4, 2011 5:49 AM
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OK I have managed to create a device object.

so ....
d = icdevice('Ag34410', 'USB::0x0957::0x0607::MY47003212::INSTR')

   Instrument Device Object Using Driver : Ag34410

   Instrument Information
      Type:               IVIInstrument
      Manufacturer:       Agilent Technologies
      Model:              Agilent34410

   Driver Information
      DriverType:         MATLAB IVI
      DriverName:         Ag34410
      DriverVersion:      1.0

   Communication State
      Status:             closed

But then I tried connecting to the multimeter.... and it gave me this error:

>> connect(d)
??? Error using ==> icdevice.connect at 117
The VXIplug&play driver could not connect to the instrument using the specified resource.
If this error is not an instrument error, use MIDEDIT to inspect the driver.

Again, i think it could be something with the driver or the conversion to .mdd (i uused the matlab conversion makemid function). How can I finally connect to the instrument and use its libraries to control it and not just the SCPI?
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lhornburg Aug 8, 2011 1:53 PM
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I haven't really used the IVI driver in matlab much. I generally just send SCPI commands. Here is a little example. Hope this helps you out.

------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------

clear all; close all; clc;

%Code for fastest reading speed
DMM = visa('AGILENT','TCPIP0::156.140.92.48::inst0::INSTR');
set(DMM,'Timeout',30); %sets timeout to 30 seconds
set(DMM,'InputBufferSize',2000000); %sets the input buffer to 2M
fopen(DMM);
%clrdevice(DMM);
fprintf (DMM, '*RST');%reset
fprintf (DMM, '*CLS');%clear
fprintf (DMM, 'CONF:VOLT:DC 10'); %sets up for DCV measurement on 10volt range
fprintf (DMM, 'FORM:DATA Real,32'); %formats data for fastest transfers
fprintf (DMM, 'FORM:BORD SWAP'); %swaps the byte order so you get the data you want
fprintf (DMM, 'sense:volt:dc:nplc min'); %sets minimum integration time
fprintf (DMM, 'sens:volt:dc:zero:auto off'); %turns off autozero
fprintf (DMM, 'disp off'); %turns off display which provides slight speed improvements you could skip this step
fprintf (DMM, 'trig:del 0'); %sets the trigger delay to 0 seconds
fprintf (DMM, 'samp:count 50000'); %sets the sample count to 50K readings per trigger
fprintf (DMM, 'trig:sour imm'); %internal trigger source
fprintf (DMM, 'init'); %initialize the dmm to start taking readings

fprintf (DMM, '*OPC?'); %returns a 1 when all 50K readings have been completed
OPC=fscanf(DMM,'%g');%stores the 1 from the *OPC
OPC %prints value of OPC query to screen
fprintf (DMM, 'DATA:REMOVE? 50000'); %begins retrieving all 50K readings from the instrument

DATA = binblockread(DMM,'single');
DATA %prints data to screen

fclose(DMM);
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oktoberfestMUC Aug 9, 2011 2:44 AM
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Thanks. This seems to work but then I am still having trouble using the connect function to connect the instrument and use its own library (the .mdd). This should be able to work...
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lhornburg Aug 9, 2011 9:05 AM
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Are you using 64 bit matlab? The driver's don't work on 64 bit.
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oktoberfestMUC Aug 10, 2011 5:17 AM
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No, its 32bit. Still the same error. I tried going step by step through the matlab connect.m file but I dont understand all that goes on. It seems ok, but it just doesnt open and i keep getting this same error!

>> connect(d)
??? Error using ==> icdevice.connect at 117
The VXIplug&play driver could not connect to the instrument using the specified
resource.
If this error is not an instrument error, use MIDEDIT to inspect the driver.

I used the matlab driver editor but I can't know what is wrong in every line. It seems like a normal standard pnp driver with the initialization, connection and closing functions in the begining.
Maybe the driver conversion was not correct for some reason or the files are not in the right places?
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hognala Aug 10, 2011 12:12 PM
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can you post your .mdd for me to take a look at? also, which version of the IVI driver are you using?
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oktoberfestMUC Aug 11, 2011 7:41 AM
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hey,

here is the info on IVI:

>> instrhwinfo('ivi')

ans =

                  LogicalNames: {'dmm'}
                    ProgramIDs: {'Agilent34410.Agilent34410'}
                       Modules: {1x20 cell}
    ConfigurationServerVersion: '1.7.0.12115'
      MasterConfigurationStore: [1x59 char]
                   IVIRootPath: 'C:\Program Files\IVI Foundation\IVI\'

I cant attach the .mdd or even when I rename it its too big to be attached here. Can I send it to you somehow?
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hognala Aug 11, 2011 1:20 PM
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So, I talked to our MATLAB partner, and he said to run the following line of code in MATLAB:
mex -setup

That will start a tool that lets you select a Visual C++ compiler. Do that (I used a Microsoft compiler) and your IVI-C based MATLAB driver will work. This is not necessary for IVI-COM based MATLAB drivers (like the ones Agilent ships with newer instruments).

This issue will be fixed in the next release of MATLAB, MATLAB R2011b.
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Agilent 34410A Mulitmeter Matlab Library Error

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