MATLAB Device Driver Wrapper: IVI-C vs IVI-COM

What is the difference in how MATLAB treats device drivers created from ivi-c vs ivi-com drivers. (I am using Agilent I/O Library Suite 16)

I downloaded, from the Agilent web site, ivi drivers for Ag33522A arbitrary waveform generator. The package installed both the ivi-c, and ivi-com "flavours" of the driver.

I used the MIDEDIT GUI to create a MATLAB wrapper for both ivi-c and ivi-com driver. I saved these in individual *.mdd files.

Then I used the TMTOOL GUI do define the hardware resource, logical name, etc, in the IVI configuration store.

Then I created 2 device objects: one using .mdd driver created from ivi-c, and the other using .mdd driver from ivi-com. Both object were created without any errors.

However, I can only connect to ivi-COM based object, but not to ivi-C one - I am NOT trying to connect both at the same time.

So, can anybody tell me what's going on?

I was under an impression that MATLAB does not care which flavour of IVI is used.

Any insight will be greatly appreciated.

tom

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Here is the command line version of my problem (I am adding this to clarify initial question). The following lines execute properly and result in the valid device object (IVI-COM):

info = instrhwinfo('ivi');

info.ProgramIDs

%in the line below the first argument is the string in ProgramIDs

makemid('Ag3352x.Ag3352x','AFG_ivicom.mdd');

obj_com=icdevice('AFG_ivicom','GPIB7::10::INSTR','optionstring','Simulate=true');

connect(obj_com)

Now, here is an attempt at creating device object based on ivi-c driver:

info = instrhwinfo('ivi');

info.Modules

% in the line below the first argument in the string in Modules

makemid('Ag3352x','AFG_ivic.mdd','ivi-c');

    obj_c=icdevice('AFG_ivic','GPIB7::10::INSTR','optionstring','Simulate=true');    

connect(obj_c)

The above line returns the following error:

??? 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.

BTW, I can't find a way to use MIDEDIT to diagnose this, either.

Any insight will be greatly appreciated.

Thank you in advance

tom

[Walter Roberson]

Which MATLAB version are you using? And 32 or 64 bit?

[Tom]

I am using 32-bit R2011a...

Answer 1

[Vinod]

Tom,

From a user's perspective, once you create the MDD file IVI-COM and IVI-C drivers will look similar in terms of interacting with it from MATLAB.

To get the IVI-C driver working, type 'mex -setup' in MATLAB and follow the steps to select your compiler. I suggest you report the issue to MathWorks technical support.

-Vinod

[Vijith Natarajan]

Hi, I did the same thing but i could create device object using both(ivi c and ivi com) but when i try to connect using tmtool. i could connect the device object which i created using ivi c. but when i try to connect using the device object of ivi com. it says "unable to connect to the instrument"

Pls help on this

[Walter Roberson]

You are replying to something that is a year old. You should not expect that Vinod will read and reply within 3 1/2 hours.

[Vijith Natarajan]

yes ..yes...